sqlglot.dialects.snowflake

   1from __future__ import annotations
   2
   3import typing as t
   4
   5from sqlglot import exp, generator, jsonpath, parser, tokens, transforms
   6from sqlglot.dialects.dialect import (
   7    Dialect,
   8    NormalizationStrategy,
   9    build_timetostr_or_tochar,
  10    binary_from_function,
  11    build_default_decimal_type,
  12    build_replace_with_optional_replacement,
  13    build_timestamp_from_parts,
  14    date_delta_sql,
  15    date_trunc_to_time,
  16    datestrtodate_sql,
  17    build_formatted_time,
  18    if_sql,
  19    inline_array_sql,
  20    max_or_greatest,
  21    min_or_least,
  22    rename_func,
  23    timestamptrunc_sql,
  24    timestrtotime_sql,
  25    var_map_sql,
  26    map_date_part,
  27    no_timestamp_sql,
  28    strposition_sql,
  29    timestampdiff_sql,
  30    no_make_interval_sql,
  31    groupconcat_sql,
  32)
  33from sqlglot.generator import unsupported_args
  34from sqlglot.helper import find_new_name, flatten, is_float, is_int, seq_get
  35from sqlglot.optimizer.scope import build_scope, find_all_in_scope
  36from sqlglot.tokens import TokenType
  37
  38if t.TYPE_CHECKING:
  39    from sqlglot._typing import E, B
  40
  41
  42# from https://docs.snowflake.com/en/sql-reference/functions/to_timestamp.html
  43def _build_datetime(
  44    name: str, kind: exp.DataType.Type, safe: bool = False
  45) -> t.Callable[[t.List], exp.Func]:
  46    def _builder(args: t.List) -> exp.Func:
  47        value = seq_get(args, 0)
  48        scale_or_fmt = seq_get(args, 1)
  49
  50        int_value = value is not None and is_int(value.name)
  51        int_scale_or_fmt = scale_or_fmt is not None and scale_or_fmt.is_int
  52
  53        if isinstance(value, exp.Literal) or (value and scale_or_fmt):
  54            # Converts calls like `TO_TIME('01:02:03')` into casts
  55            if len(args) == 1 and value.is_string and not int_value:
  56                return (
  57                    exp.TryCast(this=value, to=exp.DataType.build(kind), requires_string=True)
  58                    if safe
  59                    else exp.cast(value, kind)
  60                )
  61
  62            # Handles `TO_TIMESTAMP(str, fmt)` and `TO_TIMESTAMP(num, scale)` as special
  63            # cases so we can transpile them, since they're relatively common
  64            if kind == exp.DataType.Type.TIMESTAMP:
  65                if not safe and (int_value or int_scale_or_fmt):
  66                    # TRY_TO_TIMESTAMP('integer') is not parsed into exp.UnixToTime as
  67                    # it's not easily transpilable
  68                    return exp.UnixToTime(this=value, scale=scale_or_fmt)
  69                if not int_scale_or_fmt and not is_float(value.name):
  70                    expr = build_formatted_time(exp.StrToTime, "snowflake")(args)
  71                    expr.set("safe", safe)
  72                    return expr
  73
  74        if kind in (exp.DataType.Type.DATE, exp.DataType.Type.TIME) and not int_value:
  75            klass = exp.TsOrDsToDate if kind == exp.DataType.Type.DATE else exp.TsOrDsToTime
  76            formatted_exp = build_formatted_time(klass, "snowflake")(args)
  77            formatted_exp.set("safe", safe)
  78            return formatted_exp
  79
  80        return exp.Anonymous(this=name, expressions=args)
  81
  82    return _builder
  83
  84
  85def _build_object_construct(args: t.List) -> t.Union[exp.StarMap, exp.Struct]:
  86    expression = parser.build_var_map(args)
  87
  88    if isinstance(expression, exp.StarMap):
  89        return expression
  90
  91    return exp.Struct(
  92        expressions=[
  93            exp.PropertyEQ(this=k, expression=v) for k, v in zip(expression.keys, expression.values)
  94        ]
  95    )
  96
  97
  98def _build_datediff(args: t.List) -> exp.DateDiff:
  99    return exp.DateDiff(
 100        this=seq_get(args, 2), expression=seq_get(args, 1), unit=map_date_part(seq_get(args, 0))
 101    )
 102
 103
 104def _build_date_time_add(expr_type: t.Type[E]) -> t.Callable[[t.List], E]:
 105    def _builder(args: t.List) -> E:
 106        return expr_type(
 107            this=seq_get(args, 2),
 108            expression=seq_get(args, 1),
 109            unit=map_date_part(seq_get(args, 0)),
 110        )
 111
 112    return _builder
 113
 114
 115def _build_bitwise(expr_type: t.Type[B], name: str) -> t.Callable[[t.List], B | exp.Anonymous]:
 116    def _builder(args: t.List) -> B | exp.Anonymous:
 117        if len(args) == 3:
 118            return exp.Anonymous(this=name, expressions=args)
 119
 120        return binary_from_function(expr_type)(args)
 121
 122    return _builder
 123
 124
 125# https://docs.snowflake.com/en/sql-reference/functions/div0
 126def _build_if_from_div0(args: t.List) -> exp.If:
 127    lhs = exp._wrap(seq_get(args, 0), exp.Binary)
 128    rhs = exp._wrap(seq_get(args, 1), exp.Binary)
 129
 130    cond = exp.EQ(this=rhs, expression=exp.Literal.number(0)).and_(
 131        exp.Is(this=lhs, expression=exp.null()).not_()
 132    )
 133    true = exp.Literal.number(0)
 134    false = exp.Div(this=lhs, expression=rhs)
 135    return exp.If(this=cond, true=true, false=false)
 136
 137
 138# https://docs.snowflake.com/en/sql-reference/functions/zeroifnull
 139def _build_if_from_zeroifnull(args: t.List) -> exp.If:
 140    cond = exp.Is(this=seq_get(args, 0), expression=exp.Null())
 141    return exp.If(this=cond, true=exp.Literal.number(0), false=seq_get(args, 0))
 142
 143
 144# https://docs.snowflake.com/en/sql-reference/functions/zeroifnull
 145def _build_if_from_nullifzero(args: t.List) -> exp.If:
 146    cond = exp.EQ(this=seq_get(args, 0), expression=exp.Literal.number(0))
 147    return exp.If(this=cond, true=exp.Null(), false=seq_get(args, 0))
 148
 149
 150def _regexpilike_sql(self: Snowflake.Generator, expression: exp.RegexpILike) -> str:
 151    flag = expression.text("flag")
 152
 153    if "i" not in flag:
 154        flag += "i"
 155
 156    return self.func(
 157        "REGEXP_LIKE", expression.this, expression.expression, exp.Literal.string(flag)
 158    )
 159
 160
 161def _build_regexp_replace(args: t.List) -> exp.RegexpReplace:
 162    regexp_replace = exp.RegexpReplace.from_arg_list(args)
 163
 164    if not regexp_replace.args.get("replacement"):
 165        regexp_replace.set("replacement", exp.Literal.string(""))
 166
 167    return regexp_replace
 168
 169
 170def _show_parser(*args: t.Any, **kwargs: t.Any) -> t.Callable[[Snowflake.Parser], exp.Show]:
 171    def _parse(self: Snowflake.Parser) -> exp.Show:
 172        return self._parse_show_snowflake(*args, **kwargs)
 173
 174    return _parse
 175
 176
 177def _date_trunc_to_time(args: t.List) -> exp.DateTrunc | exp.TimestampTrunc:
 178    trunc = date_trunc_to_time(args)
 179    trunc.set("unit", map_date_part(trunc.args["unit"]))
 180    return trunc
 181
 182
 183def _unqualify_pivot_columns(expression: exp.Expression) -> exp.Expression:
 184    """
 185    Snowflake doesn't allow columns referenced in UNPIVOT to be qualified,
 186    so we need to unqualify them. Same goes for ANY ORDER BY <column>.
 187
 188    Example:
 189        >>> from sqlglot import parse_one
 190        >>> expr = parse_one("SELECT * FROM m_sales UNPIVOT(sales FOR month IN (m_sales.jan, feb, mar, april))")
 191        >>> print(_unqualify_pivot_columns(expr).sql(dialect="snowflake"))
 192        SELECT * FROM m_sales UNPIVOT(sales FOR month IN (jan, feb, mar, april))
 193    """
 194    if isinstance(expression, exp.Pivot):
 195        if expression.unpivot:
 196            expression = transforms.unqualify_columns(expression)
 197        else:
 198            for field in expression.fields:
 199                field_expr = seq_get(field.expressions if field else [], 0)
 200
 201                if isinstance(field_expr, exp.PivotAny):
 202                    unqualified_field_expr = transforms.unqualify_columns(field_expr)
 203                    t.cast(exp.Expression, field).set("expressions", unqualified_field_expr, 0)
 204
 205    return expression
 206
 207
 208def _flatten_structured_types_unless_iceberg(expression: exp.Expression) -> exp.Expression:
 209    assert isinstance(expression, exp.Create)
 210
 211    def _flatten_structured_type(expression: exp.DataType) -> exp.DataType:
 212        if expression.this in exp.DataType.NESTED_TYPES:
 213            expression.set("expressions", None)
 214        return expression
 215
 216    props = expression.args.get("properties")
 217    if isinstance(expression.this, exp.Schema) and not (props and props.find(exp.IcebergProperty)):
 218        for schema_expression in expression.this.expressions:
 219            if isinstance(schema_expression, exp.ColumnDef):
 220                column_type = schema_expression.kind
 221                if isinstance(column_type, exp.DataType):
 222                    column_type.transform(_flatten_structured_type, copy=False)
 223
 224    return expression
 225
 226
 227def _unnest_generate_date_array(unnest: exp.Unnest) -> None:
 228    generate_date_array = unnest.expressions[0]
 229    start = generate_date_array.args.get("start")
 230    end = generate_date_array.args.get("end")
 231    step = generate_date_array.args.get("step")
 232
 233    if not start or not end or not isinstance(step, exp.Interval) or step.name != "1":
 234        return
 235
 236    unit = step.args.get("unit")
 237
 238    unnest_alias = unnest.args.get("alias")
 239    if unnest_alias:
 240        unnest_alias = unnest_alias.copy()
 241        sequence_value_name = seq_get(unnest_alias.columns, 0) or "value"
 242    else:
 243        sequence_value_name = "value"
 244
 245    # We'll add the next sequence value to the starting date and project the result
 246    date_add = _build_date_time_add(exp.DateAdd)(
 247        [unit, exp.cast(sequence_value_name, "int"), exp.cast(start, "date")]
 248    )
 249
 250    # We use DATEDIFF to compute the number of sequence values needed
 251    number_sequence = Snowflake.Parser.FUNCTIONS["ARRAY_GENERATE_RANGE"](
 252        [exp.Literal.number(0), _build_datediff([unit, start, end]) + 1]
 253    )
 254
 255    unnest.set("expressions", [number_sequence])
 256
 257    unnest_parent = unnest.parent
 258    if isinstance(unnest_parent, exp.Join):
 259        select = unnest_parent.parent
 260        if isinstance(select, exp.Select):
 261            replace_column_name = (
 262                sequence_value_name
 263                if isinstance(sequence_value_name, str)
 264                else sequence_value_name.name
 265            )
 266
 267            scope = build_scope(select)
 268            if scope:
 269                for column in scope.columns:
 270                    if column.name.lower() == replace_column_name.lower():
 271                        column.replace(
 272                            date_add.as_(replace_column_name)
 273                            if isinstance(column.parent, exp.Select)
 274                            else date_add
 275                        )
 276
 277            lateral = exp.Lateral(this=unnest_parent.this.pop())
 278            unnest_parent.replace(exp.Join(this=lateral))
 279    else:
 280        unnest.replace(
 281            exp.select(date_add.as_(sequence_value_name))
 282            .from_(unnest.copy())
 283            .subquery(unnest_alias)
 284        )
 285
 286
 287def _transform_generate_date_array(expression: exp.Expression) -> exp.Expression:
 288    if isinstance(expression, exp.Select):
 289        for generate_date_array in expression.find_all(exp.GenerateDateArray):
 290            parent = generate_date_array.parent
 291
 292            # If GENERATE_DATE_ARRAY is used directly as an array (e.g passed into ARRAY_LENGTH), the transformed Snowflake
 293            # query is the following (it'll be unnested properly on the next iteration due to copy):
 294            # SELECT ref(GENERATE_DATE_ARRAY(...)) -> SELECT ref((SELECT ARRAY_AGG(*) FROM UNNEST(GENERATE_DATE_ARRAY(...))))
 295            if not isinstance(parent, exp.Unnest):
 296                unnest = exp.Unnest(expressions=[generate_date_array.copy()])
 297                generate_date_array.replace(
 298                    exp.select(exp.ArrayAgg(this=exp.Star())).from_(unnest).subquery()
 299                )
 300
 301            if (
 302                isinstance(parent, exp.Unnest)
 303                and isinstance(parent.parent, (exp.From, exp.Join))
 304                and len(parent.expressions) == 1
 305            ):
 306                _unnest_generate_date_array(parent)
 307
 308    return expression
 309
 310
 311def _build_regexp_extract(expr_type: t.Type[E]) -> t.Callable[[t.List], E]:
 312    def _builder(args: t.List) -> E:
 313        return expr_type(
 314            this=seq_get(args, 0),
 315            expression=seq_get(args, 1),
 316            position=seq_get(args, 2),
 317            occurrence=seq_get(args, 3),
 318            parameters=seq_get(args, 4),
 319            group=seq_get(args, 5) or exp.Literal.number(0),
 320        )
 321
 322    return _builder
 323
 324
 325def _regexpextract_sql(self, expression: exp.RegexpExtract | exp.RegexpExtractAll) -> str:
 326    # Other dialects don't support all of the following parameters, so we need to
 327    # generate default values as necessary to ensure the transpilation is correct
 328    group = expression.args.get("group")
 329
 330    # To avoid generating all these default values, we set group to None if
 331    # it's 0 (also default value) which doesn't trigger the following chain
 332    if group and group.name == "0":
 333        group = None
 334
 335    parameters = expression.args.get("parameters") or (group and exp.Literal.string("c"))
 336    occurrence = expression.args.get("occurrence") or (parameters and exp.Literal.number(1))
 337    position = expression.args.get("position") or (occurrence and exp.Literal.number(1))
 338
 339    return self.func(
 340        "REGEXP_SUBSTR" if isinstance(expression, exp.RegexpExtract) else "REGEXP_EXTRACT_ALL",
 341        expression.this,
 342        expression.expression,
 343        position,
 344        occurrence,
 345        parameters,
 346        group,
 347    )
 348
 349
 350def _json_extract_value_array_sql(
 351    self: Snowflake.Generator, expression: exp.JSONValueArray | exp.JSONExtractArray
 352) -> str:
 353    json_extract = exp.JSONExtract(this=expression.this, expression=expression.expression)
 354    ident = exp.to_identifier("x")
 355
 356    if isinstance(expression, exp.JSONValueArray):
 357        this: exp.Expression = exp.cast(ident, to=exp.DataType.Type.VARCHAR)
 358    else:
 359        this = exp.ParseJSON(this=f"TO_JSON({ident})")
 360
 361    transform_lambda = exp.Lambda(expressions=[ident], this=this)
 362
 363    return self.func("TRANSFORM", json_extract, transform_lambda)
 364
 365
 366def _qualify_unnested_columns(expression: exp.Expression) -> exp.Expression:
 367    if isinstance(expression, exp.Select):
 368        scope = build_scope(expression)
 369        if not scope:
 370            return expression
 371
 372        unnests = list(scope.find_all(exp.Unnest))
 373
 374        if not unnests:
 375            return expression
 376
 377        taken_source_names = set(scope.sources)
 378        column_source: t.Dict[str, exp.Identifier] = {}
 379
 380        unnest_identifier: t.Optional[exp.Identifier] = None
 381        orig_expression = expression.copy()
 382
 383        for unnest in unnests:
 384            if not isinstance(unnest.parent, (exp.From, exp.Join)):
 385                continue
 386
 387            # Try to infer column names produced by an unnest operator. This is only possible
 388            # when we can peek into the (statically known) contents of the unnested value.
 389            unnest_columns: t.Set[str] = set()
 390            for unnest_expr in unnest.expressions:
 391                if not isinstance(unnest_expr, exp.Array):
 392                    continue
 393
 394                for array_expr in unnest_expr.expressions:
 395                    if not (
 396                        isinstance(array_expr, exp.Struct)
 397                        and array_expr.expressions
 398                        and all(
 399                            isinstance(struct_expr, exp.PropertyEQ)
 400                            for struct_expr in array_expr.expressions
 401                        )
 402                    ):
 403                        continue
 404
 405                    unnest_columns.update(
 406                        struct_expr.this.name.lower() for struct_expr in array_expr.expressions
 407                    )
 408                    break
 409
 410                if unnest_columns:
 411                    break
 412
 413            unnest_alias = unnest.args.get("alias")
 414            if not unnest_alias:
 415                alias_name = find_new_name(taken_source_names, "value")
 416                taken_source_names.add(alias_name)
 417
 418                # Produce a `TableAlias` AST similar to what is produced for BigQuery. This
 419                # will be corrected later, when we generate SQL for the `Unnest` AST node.
 420                aliased_unnest = exp.alias_(unnest, None, table=[alias_name])
 421                scope.replace(unnest, aliased_unnest)
 422
 423                unnest_identifier = aliased_unnest.args["alias"].columns[0]
 424            else:
 425                alias_columns = getattr(unnest_alias, "columns", [])
 426                unnest_identifier = unnest_alias.this or seq_get(alias_columns, 0)
 427
 428            if not isinstance(unnest_identifier, exp.Identifier):
 429                return orig_expression
 430
 431            column_source.update({c.lower(): unnest_identifier for c in unnest_columns})
 432
 433        for column in scope.columns:
 434            if column.table:
 435                continue
 436
 437            table = column_source.get(column.name.lower())
 438            if (
 439                unnest_identifier
 440                and not table
 441                and len(scope.sources) == 1
 442                and column.name.lower() != unnest_identifier.name.lower()
 443            ):
 444                table = unnest_identifier
 445
 446            column.set("table", table and table.copy())
 447
 448    return expression
 449
 450
 451def _eliminate_dot_variant_lookup(expression: exp.Expression) -> exp.Expression:
 452    if isinstance(expression, exp.Select):
 453        # This transformation is used to facilitate transpilation of BigQuery `UNNEST` operations
 454        # to Snowflake. It should not affect roundtrip because `Unnest` nodes cannot be produced
 455        # by Snowflake's parser.
 456        #
 457        # Additionally, at the time of writing this, BigQuery is the only dialect that produces a
 458        # `TableAlias` node that only fills `columns` and not `this`, due to `UNNEST_COLUMN_ONLY`.
 459        unnest_aliases = set()
 460        for unnest in find_all_in_scope(expression, exp.Unnest):
 461            unnest_alias = unnest.args.get("alias")
 462            if (
 463                isinstance(unnest_alias, exp.TableAlias)
 464                and not unnest_alias.this
 465                and len(unnest_alias.columns) == 1
 466            ):
 467                unnest_aliases.add(unnest_alias.columns[0].name)
 468
 469        if unnest_aliases:
 470            for c in find_all_in_scope(expression, exp.Column):
 471                if c.table in unnest_aliases:
 472                    bracket_lhs = c.args["table"]
 473                    bracket_rhs = exp.Literal.string(c.name)
 474                    bracket = exp.Bracket(this=bracket_lhs, expressions=[bracket_rhs])
 475
 476                    if c.parent is expression:
 477                        # Retain column projection names by using aliases
 478                        c.replace(exp.alias_(bracket, c.this.copy()))
 479                    else:
 480                        c.replace(bracket)
 481
 482    return expression
 483
 484
 485class Snowflake(Dialect):
 486    # https://docs.snowflake.com/en/sql-reference/identifiers-syntax
 487    NORMALIZATION_STRATEGY = NormalizationStrategy.UPPERCASE
 488    NULL_ORDERING = "nulls_are_large"
 489    TIME_FORMAT = "'YYYY-MM-DD HH24:MI:SS'"
 490    SUPPORTS_USER_DEFINED_TYPES = False
 491    SUPPORTS_SEMI_ANTI_JOIN = False
 492    PREFER_CTE_ALIAS_COLUMN = True
 493    TABLESAMPLE_SIZE_IS_PERCENT = True
 494    COPY_PARAMS_ARE_CSV = False
 495    ARRAY_AGG_INCLUDES_NULLS = None
 496    ALTER_TABLE_ADD_REQUIRED_FOR_EACH_COLUMN = False
 497    TRY_CAST_REQUIRES_STRING = True
 498
 499    TIME_MAPPING = {
 500        "YYYY": "%Y",
 501        "yyyy": "%Y",
 502        "YY": "%y",
 503        "yy": "%y",
 504        "MMMM": "%B",
 505        "mmmm": "%B",
 506        "MON": "%b",
 507        "mon": "%b",
 508        "MM": "%m",
 509        "mm": "%m",
 510        "DD": "%d",
 511        "dd": "%-d",
 512        "DY": "%a",
 513        "dy": "%w",
 514        "HH24": "%H",
 515        "hh24": "%H",
 516        "HH12": "%I",
 517        "hh12": "%I",
 518        "MI": "%M",
 519        "mi": "%M",
 520        "SS": "%S",
 521        "ss": "%S",
 522        "FF6": "%f",
 523        "ff6": "%f",
 524    }
 525
 526    DATE_PART_MAPPING = {
 527        **Dialect.DATE_PART_MAPPING,
 528        "ISOWEEK": "WEEKISO",
 529    }
 530
 531    def quote_identifier(self, expression: E, identify: bool = True) -> E:
 532        # This disables quoting DUAL in SELECT ... FROM DUAL, because Snowflake treats an
 533        # unquoted DUAL keyword in a special way and does not map it to a user-defined table
 534        if (
 535            isinstance(expression, exp.Identifier)
 536            and isinstance(expression.parent, exp.Table)
 537            and expression.name.lower() == "dual"
 538        ):
 539            return expression  # type: ignore
 540
 541        return super().quote_identifier(expression, identify=identify)
 542
 543    class JSONPathTokenizer(jsonpath.JSONPathTokenizer):
 544        SINGLE_TOKENS = jsonpath.JSONPathTokenizer.SINGLE_TOKENS.copy()
 545        SINGLE_TOKENS.pop("$")
 546
 547    class Parser(parser.Parser):
 548        IDENTIFY_PIVOT_STRINGS = True
 549        DEFAULT_SAMPLING_METHOD = "BERNOULLI"
 550        COLON_IS_VARIANT_EXTRACT = True
 551        JSON_EXTRACT_REQUIRES_JSON_EXPRESSION = True
 552
 553        ID_VAR_TOKENS = {
 554            *parser.Parser.ID_VAR_TOKENS,
 555            TokenType.EXCEPT,
 556            TokenType.MATCH_CONDITION,
 557        }
 558
 559        TABLE_ALIAS_TOKENS = parser.Parser.TABLE_ALIAS_TOKENS | {TokenType.WINDOW}
 560        TABLE_ALIAS_TOKENS.discard(TokenType.MATCH_CONDITION)
 561
 562        COLON_PLACEHOLDER_TOKENS = ID_VAR_TOKENS | {TokenType.NUMBER}
 563
 564        FUNCTIONS = {
 565            **parser.Parser.FUNCTIONS,
 566            "APPROX_PERCENTILE": exp.ApproxQuantile.from_arg_list,
 567            "ARRAY_CONSTRUCT": lambda args: exp.Array(expressions=args),
 568            "ARRAY_CONTAINS": lambda args: exp.ArrayContains(
 569                this=seq_get(args, 1), expression=seq_get(args, 0)
 570            ),
 571            "ARRAY_GENERATE_RANGE": lambda args: exp.GenerateSeries(
 572                # ARRAY_GENERATE_RANGE has an exlusive end; we normalize it to be inclusive
 573                start=seq_get(args, 0),
 574                end=exp.Sub(this=seq_get(args, 1), expression=exp.Literal.number(1)),
 575                step=seq_get(args, 2),
 576            ),
 577            "BITXOR": _build_bitwise(exp.BitwiseXor, "BITXOR"),
 578            "BIT_XOR": _build_bitwise(exp.BitwiseXor, "BITXOR"),
 579            "BITOR": _build_bitwise(exp.BitwiseOr, "BITOR"),
 580            "BIT_OR": _build_bitwise(exp.BitwiseOr, "BITOR"),
 581            "BITSHIFTLEFT": _build_bitwise(exp.BitwiseLeftShift, "BITSHIFTLEFT"),
 582            "BIT_SHIFTLEFT": _build_bitwise(exp.BitwiseLeftShift, "BIT_SHIFTLEFT"),
 583            "BITSHIFTRIGHT": _build_bitwise(exp.BitwiseRightShift, "BITSHIFTRIGHT"),
 584            "BIT_SHIFTRIGHT": _build_bitwise(exp.BitwiseRightShift, "BIT_SHIFTRIGHT"),
 585            "BOOLXOR": _build_bitwise(exp.Xor, "BOOLXOR"),
 586            "DATE": _build_datetime("DATE", exp.DataType.Type.DATE),
 587            "DATE_TRUNC": _date_trunc_to_time,
 588            "DATEADD": _build_date_time_add(exp.DateAdd),
 589            "DATEDIFF": _build_datediff,
 590            "DIV0": _build_if_from_div0,
 591            "EDITDISTANCE": lambda args: exp.Levenshtein(
 592                this=seq_get(args, 0), expression=seq_get(args, 1), max_dist=seq_get(args, 2)
 593            ),
 594            "FLATTEN": exp.Explode.from_arg_list,
 595            "GET": exp.GetExtract.from_arg_list,
 596            "GET_PATH": lambda args, dialect: exp.JSONExtract(
 597                this=seq_get(args, 0),
 598                expression=dialect.to_json_path(seq_get(args, 1)),
 599                requires_json=True,
 600            ),
 601            "HEX_DECODE_BINARY": exp.Unhex.from_arg_list,
 602            "IFF": exp.If.from_arg_list,
 603            "LAST_DAY": lambda args: exp.LastDay(
 604                this=seq_get(args, 0), unit=map_date_part(seq_get(args, 1))
 605            ),
 606            "LEN": lambda args: exp.Length(this=seq_get(args, 0), binary=True),
 607            "LENGTH": lambda args: exp.Length(this=seq_get(args, 0), binary=True),
 608            "NULLIFZERO": _build_if_from_nullifzero,
 609            "OBJECT_CONSTRUCT": _build_object_construct,
 610            "REGEXP_EXTRACT_ALL": _build_regexp_extract(exp.RegexpExtractAll),
 611            "REGEXP_REPLACE": _build_regexp_replace,
 612            "REGEXP_SUBSTR": _build_regexp_extract(exp.RegexpExtract),
 613            "REGEXP_SUBSTR_ALL": _build_regexp_extract(exp.RegexpExtractAll),
 614            "REPLACE": build_replace_with_optional_replacement,
 615            "RLIKE": exp.RegexpLike.from_arg_list,
 616            "SQUARE": lambda args: exp.Pow(this=seq_get(args, 0), expression=exp.Literal.number(2)),
 617            "TABLE": lambda args: exp.TableFromRows(this=seq_get(args, 0)),
 618            "TIMEADD": _build_date_time_add(exp.TimeAdd),
 619            "TIMEDIFF": _build_datediff,
 620            "TIMESTAMPADD": _build_date_time_add(exp.DateAdd),
 621            "TIMESTAMPDIFF": _build_datediff,
 622            "TIMESTAMPFROMPARTS": build_timestamp_from_parts,
 623            "TIMESTAMP_FROM_PARTS": build_timestamp_from_parts,
 624            "TIMESTAMPNTZFROMPARTS": build_timestamp_from_parts,
 625            "TIMESTAMP_NTZ_FROM_PARTS": build_timestamp_from_parts,
 626            "TRY_PARSE_JSON": lambda args: exp.ParseJSON(this=seq_get(args, 0), safe=True),
 627            "TRY_TO_DATE": _build_datetime("TRY_TO_DATE", exp.DataType.Type.DATE, safe=True),
 628            "TRY_TO_TIME": _build_datetime("TRY_TO_TIME", exp.DataType.Type.TIME, safe=True),
 629            "TRY_TO_TIMESTAMP": _build_datetime(
 630                "TRY_TO_TIMESTAMP", exp.DataType.Type.TIMESTAMP, safe=True
 631            ),
 632            "TO_CHAR": build_timetostr_or_tochar,
 633            "TO_DATE": _build_datetime("TO_DATE", exp.DataType.Type.DATE),
 634            "TO_NUMBER": lambda args: exp.ToNumber(
 635                this=seq_get(args, 0),
 636                format=seq_get(args, 1),
 637                precision=seq_get(args, 2),
 638                scale=seq_get(args, 3),
 639            ),
 640            "TO_TIME": _build_datetime("TO_TIME", exp.DataType.Type.TIME),
 641            "TO_TIMESTAMP": _build_datetime("TO_TIMESTAMP", exp.DataType.Type.TIMESTAMP),
 642            "TO_TIMESTAMP_LTZ": _build_datetime("TO_TIMESTAMP_LTZ", exp.DataType.Type.TIMESTAMPLTZ),
 643            "TO_TIMESTAMP_NTZ": _build_datetime("TO_TIMESTAMP_NTZ", exp.DataType.Type.TIMESTAMP),
 644            "TO_TIMESTAMP_TZ": _build_datetime("TO_TIMESTAMP_TZ", exp.DataType.Type.TIMESTAMPTZ),
 645            "TO_VARCHAR": exp.ToChar.from_arg_list,
 646            "ZEROIFNULL": _build_if_from_zeroifnull,
 647        }
 648
 649        FUNCTION_PARSERS = {
 650            **parser.Parser.FUNCTION_PARSERS,
 651            "DATE_PART": lambda self: self._parse_date_part(),
 652            "OBJECT_CONSTRUCT_KEEP_NULL": lambda self: self._parse_json_object(),
 653            "LISTAGG": lambda self: self._parse_string_agg(),
 654            "SEMANTIC_VIEW": lambda self: self._parse_semantic_view(),
 655        }
 656        FUNCTION_PARSERS.pop("TRIM")
 657
 658        TIMESTAMPS = parser.Parser.TIMESTAMPS - {TokenType.TIME}
 659
 660        ALTER_PARSERS = {
 661            **parser.Parser.ALTER_PARSERS,
 662            "UNSET": lambda self: self.expression(
 663                exp.Set,
 664                tag=self._match_text_seq("TAG"),
 665                expressions=self._parse_csv(self._parse_id_var),
 666                unset=True,
 667            ),
 668        }
 669
 670        STATEMENT_PARSERS = {
 671            **parser.Parser.STATEMENT_PARSERS,
 672            TokenType.GET: lambda self: self._parse_get(),
 673            TokenType.PUT: lambda self: self._parse_put(),
 674            TokenType.SHOW: lambda self: self._parse_show(),
 675        }
 676
 677        PROPERTY_PARSERS = {
 678            **parser.Parser.PROPERTY_PARSERS,
 679            "CREDENTIALS": lambda self: self._parse_credentials_property(),
 680            "FILE_FORMAT": lambda self: self._parse_file_format_property(),
 681            "LOCATION": lambda self: self._parse_location_property(),
 682            "TAG": lambda self: self._parse_tag(),
 683            "USING": lambda self: self._match_text_seq("TEMPLATE")
 684            and self.expression(exp.UsingTemplateProperty, this=self._parse_statement()),
 685        }
 686
 687        TYPE_CONVERTERS = {
 688            # https://docs.snowflake.com/en/sql-reference/data-types-numeric#number
 689            exp.DataType.Type.DECIMAL: build_default_decimal_type(precision=38, scale=0),
 690        }
 691
 692        SHOW_PARSERS = {
 693            "DATABASES": _show_parser("DATABASES"),
 694            "TERSE DATABASES": _show_parser("DATABASES"),
 695            "SCHEMAS": _show_parser("SCHEMAS"),
 696            "TERSE SCHEMAS": _show_parser("SCHEMAS"),
 697            "OBJECTS": _show_parser("OBJECTS"),
 698            "TERSE OBJECTS": _show_parser("OBJECTS"),
 699            "TABLES": _show_parser("TABLES"),
 700            "TERSE TABLES": _show_parser("TABLES"),
 701            "VIEWS": _show_parser("VIEWS"),
 702            "TERSE VIEWS": _show_parser("VIEWS"),
 703            "PRIMARY KEYS": _show_parser("PRIMARY KEYS"),
 704            "TERSE PRIMARY KEYS": _show_parser("PRIMARY KEYS"),
 705            "IMPORTED KEYS": _show_parser("IMPORTED KEYS"),
 706            "TERSE IMPORTED KEYS": _show_parser("IMPORTED KEYS"),
 707            "UNIQUE KEYS": _show_parser("UNIQUE KEYS"),
 708            "TERSE UNIQUE KEYS": _show_parser("UNIQUE KEYS"),
 709            "SEQUENCES": _show_parser("SEQUENCES"),
 710            "TERSE SEQUENCES": _show_parser("SEQUENCES"),
 711            "STAGES": _show_parser("STAGES"),
 712            "COLUMNS": _show_parser("COLUMNS"),
 713            "USERS": _show_parser("USERS"),
 714            "TERSE USERS": _show_parser("USERS"),
 715            "FILE FORMATS": _show_parser("FILE FORMATS"),
 716            "FUNCTIONS": _show_parser("FUNCTIONS"),
 717            "PROCEDURES": _show_parser("PROCEDURES"),
 718            "WAREHOUSES": _show_parser("WAREHOUSES"),
 719        }
 720
 721        CONSTRAINT_PARSERS = {
 722            **parser.Parser.CONSTRAINT_PARSERS,
 723            "WITH": lambda self: self._parse_with_constraint(),
 724            "MASKING": lambda self: self._parse_with_constraint(),
 725            "PROJECTION": lambda self: self._parse_with_constraint(),
 726            "TAG": lambda self: self._parse_with_constraint(),
 727        }
 728
 729        STAGED_FILE_SINGLE_TOKENS = {
 730            TokenType.DOT,
 731            TokenType.MOD,
 732            TokenType.SLASH,
 733        }
 734
 735        FLATTEN_COLUMNS = ["SEQ", "KEY", "PATH", "INDEX", "VALUE", "THIS"]
 736
 737        SCHEMA_KINDS = {"OBJECTS", "TABLES", "VIEWS", "SEQUENCES", "UNIQUE KEYS", "IMPORTED KEYS"}
 738
 739        NON_TABLE_CREATABLES = {"STORAGE INTEGRATION", "TAG", "WAREHOUSE", "STREAMLIT"}
 740
 741        LAMBDAS = {
 742            **parser.Parser.LAMBDAS,
 743            TokenType.ARROW: lambda self, expressions: self.expression(
 744                exp.Lambda,
 745                this=self._replace_lambda(
 746                    self._parse_assignment(),
 747                    expressions,
 748                ),
 749                expressions=[e.this if isinstance(e, exp.Cast) else e for e in expressions],
 750            ),
 751        }
 752
 753        def _parse_use(self) -> exp.Use:
 754            if self._match_text_seq("SECONDARY", "ROLES"):
 755                this = self._match_texts(("ALL", "NONE")) and exp.var(self._prev.text.upper())
 756                roles = None if this else self._parse_csv(lambda: self._parse_table(schema=False))
 757                return self.expression(
 758                    exp.Use, kind="SECONDARY ROLES", this=this, expressions=roles
 759                )
 760
 761            return super()._parse_use()
 762
 763        def _negate_range(
 764            self, this: t.Optional[exp.Expression] = None
 765        ) -> t.Optional[exp.Expression]:
 766            if not this:
 767                return this
 768
 769            query = this.args.get("query")
 770            if isinstance(this, exp.In) and isinstance(query, exp.Query):
 771                # Snowflake treats `value NOT IN (subquery)` as `VALUE <> ALL (subquery)`, so
 772                # we do this conversion here to avoid parsing it into `NOT value IN (subquery)`
 773                # which can produce different results (most likely a SnowFlake bug).
 774                #
 775                # https://docs.snowflake.com/en/sql-reference/functions/in
 776                # Context: https://github.com/tobymao/sqlglot/issues/3890
 777                return self.expression(
 778                    exp.NEQ, this=this.this, expression=exp.All(this=query.unnest())
 779                )
 780
 781            return self.expression(exp.Not, this=this)
 782
 783        def _parse_tag(self) -> exp.Tags:
 784            return self.expression(
 785                exp.Tags,
 786                expressions=self._parse_wrapped_csv(self._parse_property),
 787            )
 788
 789        def _parse_with_constraint(self) -> t.Optional[exp.Expression]:
 790            if self._prev.token_type != TokenType.WITH:
 791                self._retreat(self._index - 1)
 792
 793            if self._match_text_seq("MASKING", "POLICY"):
 794                policy = self._parse_column()
 795                return self.expression(
 796                    exp.MaskingPolicyColumnConstraint,
 797                    this=policy.to_dot() if isinstance(policy, exp.Column) else policy,
 798                    expressions=self._match(TokenType.USING)
 799                    and self._parse_wrapped_csv(self._parse_id_var),
 800                )
 801            if self._match_text_seq("PROJECTION", "POLICY"):
 802                policy = self._parse_column()
 803                return self.expression(
 804                    exp.ProjectionPolicyColumnConstraint,
 805                    this=policy.to_dot() if isinstance(policy, exp.Column) else policy,
 806                )
 807            if self._match(TokenType.TAG):
 808                return self._parse_tag()
 809
 810            return None
 811
 812        def _parse_with_property(self) -> t.Optional[exp.Expression] | t.List[exp.Expression]:
 813            if self._match(TokenType.TAG):
 814                return self._parse_tag()
 815
 816            return super()._parse_with_property()
 817
 818        def _parse_create(self) -> exp.Create | exp.Command:
 819            expression = super()._parse_create()
 820            if isinstance(expression, exp.Create) and expression.kind in self.NON_TABLE_CREATABLES:
 821                # Replace the Table node with the enclosed Identifier
 822                expression.this.replace(expression.this.this)
 823
 824            return expression
 825
 826        # https://docs.snowflake.com/en/sql-reference/functions/date_part.html
 827        # https://docs.snowflake.com/en/sql-reference/functions-date-time.html#label-supported-date-time-parts
 828        def _parse_date_part(self: Snowflake.Parser) -> t.Optional[exp.Expression]:
 829            this = self._parse_var() or self._parse_type()
 830
 831            if not this:
 832                return None
 833
 834            self._match(TokenType.COMMA)
 835            expression = self._parse_bitwise()
 836            this = map_date_part(this)
 837            name = this.name.upper()
 838
 839            if name.startswith("EPOCH"):
 840                if name == "EPOCH_MILLISECOND":
 841                    scale = 10**3
 842                elif name == "EPOCH_MICROSECOND":
 843                    scale = 10**6
 844                elif name == "EPOCH_NANOSECOND":
 845                    scale = 10**9
 846                else:
 847                    scale = None
 848
 849                ts = self.expression(exp.Cast, this=expression, to=exp.DataType.build("TIMESTAMP"))
 850                to_unix: exp.Expression = self.expression(exp.TimeToUnix, this=ts)
 851
 852                if scale:
 853                    to_unix = exp.Mul(this=to_unix, expression=exp.Literal.number(scale))
 854
 855                return to_unix
 856
 857            return self.expression(exp.Extract, this=this, expression=expression)
 858
 859        def _parse_bracket_key_value(self, is_map: bool = False) -> t.Optional[exp.Expression]:
 860            if is_map:
 861                # Keys are strings in Snowflake's objects, see also:
 862                # - https://docs.snowflake.com/en/sql-reference/data-types-semistructured
 863                # - https://docs.snowflake.com/en/sql-reference/functions/object_construct
 864                return self._parse_slice(self._parse_string())
 865
 866            return self._parse_slice(self._parse_alias(self._parse_assignment(), explicit=True))
 867
 868        def _parse_lateral(self) -> t.Optional[exp.Lateral]:
 869            lateral = super()._parse_lateral()
 870            if not lateral:
 871                return lateral
 872
 873            if isinstance(lateral.this, exp.Explode):
 874                table_alias = lateral.args.get("alias")
 875                columns = [exp.to_identifier(col) for col in self.FLATTEN_COLUMNS]
 876                if table_alias and not table_alias.args.get("columns"):
 877                    table_alias.set("columns", columns)
 878                elif not table_alias:
 879                    exp.alias_(lateral, "_flattened", table=columns, copy=False)
 880
 881            return lateral
 882
 883        def _parse_table_parts(
 884            self, schema: bool = False, is_db_reference: bool = False, wildcard: bool = False
 885        ) -> exp.Table:
 886            # https://docs.snowflake.com/en/user-guide/querying-stage
 887            if self._match(TokenType.STRING, advance=False):
 888                table = self._parse_string()
 889            elif self._match_text_seq("@", advance=False):
 890                table = self._parse_location_path()
 891            else:
 892                table = None
 893
 894            if table:
 895                file_format = None
 896                pattern = None
 897
 898                wrapped = self._match(TokenType.L_PAREN)
 899                while self._curr and wrapped and not self._match(TokenType.R_PAREN):
 900                    if self._match_text_seq("FILE_FORMAT", "=>"):
 901                        file_format = self._parse_string() or super()._parse_table_parts(
 902                            is_db_reference=is_db_reference
 903                        )
 904                    elif self._match_text_seq("PATTERN", "=>"):
 905                        pattern = self._parse_string()
 906                    else:
 907                        break
 908
 909                    self._match(TokenType.COMMA)
 910
 911                table = self.expression(exp.Table, this=table, format=file_format, pattern=pattern)
 912            else:
 913                table = super()._parse_table_parts(schema=schema, is_db_reference=is_db_reference)
 914
 915            return table
 916
 917        def _parse_table(
 918            self,
 919            schema: bool = False,
 920            joins: bool = False,
 921            alias_tokens: t.Optional[t.Collection[TokenType]] = None,
 922            parse_bracket: bool = False,
 923            is_db_reference: bool = False,
 924            parse_partition: bool = False,
 925            consume_pipe: bool = False,
 926        ) -> t.Optional[exp.Expression]:
 927            table = super()._parse_table(
 928                schema=schema,
 929                joins=joins,
 930                alias_tokens=alias_tokens,
 931                parse_bracket=parse_bracket,
 932                is_db_reference=is_db_reference,
 933                parse_partition=parse_partition,
 934            )
 935            if isinstance(table, exp.Table) and isinstance(table.this, exp.TableFromRows):
 936                table_from_rows = table.this
 937                for arg in exp.TableFromRows.arg_types:
 938                    if arg != "this":
 939                        table_from_rows.set(arg, table.args.get(arg))
 940
 941                table = table_from_rows
 942
 943            return table
 944
 945        def _parse_id_var(
 946            self,
 947            any_token: bool = True,
 948            tokens: t.Optional[t.Collection[TokenType]] = None,
 949        ) -> t.Optional[exp.Expression]:
 950            if self._match_text_seq("IDENTIFIER", "("):
 951                identifier = (
 952                    super()._parse_id_var(any_token=any_token, tokens=tokens)
 953                    or self._parse_string()
 954                )
 955                self._match_r_paren()
 956                return self.expression(exp.Anonymous, this="IDENTIFIER", expressions=[identifier])
 957
 958            return super()._parse_id_var(any_token=any_token, tokens=tokens)
 959
 960        def _parse_show_snowflake(self, this: str) -> exp.Show:
 961            scope = None
 962            scope_kind = None
 963
 964            # will identity SHOW TERSE SCHEMAS but not SHOW TERSE PRIMARY KEYS
 965            # which is syntactically valid but has no effect on the output
 966            terse = self._tokens[self._index - 2].text.upper() == "TERSE"
 967
 968            history = self._match_text_seq("HISTORY")
 969
 970            like = self._parse_string() if self._match(TokenType.LIKE) else None
 971
 972            if self._match(TokenType.IN):
 973                if self._match_text_seq("ACCOUNT"):
 974                    scope_kind = "ACCOUNT"
 975                elif self._match_text_seq("CLASS"):
 976                    scope_kind = "CLASS"
 977                    scope = self._parse_table_parts()
 978                elif self._match_text_seq("APPLICATION"):
 979                    scope_kind = "APPLICATION"
 980                    if self._match_text_seq("PACKAGE"):
 981                        scope_kind += " PACKAGE"
 982                    scope = self._parse_table_parts()
 983                elif self._match_set(self.DB_CREATABLES):
 984                    scope_kind = self._prev.text.upper()
 985                    if self._curr:
 986                        scope = self._parse_table_parts()
 987                elif self._curr:
 988                    scope_kind = "SCHEMA" if this in self.SCHEMA_KINDS else "TABLE"
 989                    scope = self._parse_table_parts()
 990
 991            return self.expression(
 992                exp.Show,
 993                **{
 994                    "terse": terse,
 995                    "this": this,
 996                    "history": history,
 997                    "like": like,
 998                    "scope": scope,
 999                    "scope_kind": scope_kind,
1000                    "starts_with": self._match_text_seq("STARTS", "WITH") and self._parse_string(),
1001                    "limit": self._parse_limit(),
1002                    "from": self._parse_string() if self._match(TokenType.FROM) else None,
1003                    "privileges": self._match_text_seq("WITH", "PRIVILEGES")
1004                    and self._parse_csv(lambda: self._parse_var(any_token=True, upper=True)),
1005                },
1006            )
1007
1008        def _parse_put(self) -> exp.Put | exp.Command:
1009            if self._curr.token_type != TokenType.STRING:
1010                return self._parse_as_command(self._prev)
1011
1012            return self.expression(
1013                exp.Put,
1014                this=self._parse_string(),
1015                target=self._parse_location_path(),
1016                properties=self._parse_properties(),
1017            )
1018
1019        def _parse_get(self) -> t.Optional[exp.Expression]:
1020            start = self._prev
1021
1022            # If we detect GET( then we need to parse a function, not a statement
1023            if self._match(TokenType.L_PAREN):
1024                self._retreat(self._index - 2)
1025                return self._parse_expression()
1026
1027            target = self._parse_location_path()
1028
1029            # Parse as command if unquoted file path
1030            if self._curr.token_type == TokenType.URI_START:
1031                return self._parse_as_command(start)
1032
1033            return self.expression(
1034                exp.Get,
1035                this=self._parse_string(),
1036                target=target,
1037                properties=self._parse_properties(),
1038            )
1039
1040        def _parse_location_property(self) -> exp.LocationProperty:
1041            self._match(TokenType.EQ)
1042            return self.expression(exp.LocationProperty, this=self._parse_location_path())
1043
1044        def _parse_file_location(self) -> t.Optional[exp.Expression]:
1045            # Parse either a subquery or a staged file
1046            return (
1047                self._parse_select(table=True, parse_subquery_alias=False)
1048                if self._match(TokenType.L_PAREN, advance=False)
1049                else self._parse_table_parts()
1050            )
1051
1052        def _parse_location_path(self) -> exp.Var:
1053            start = self._curr
1054            self._advance_any(ignore_reserved=True)
1055
1056            # We avoid consuming a comma token because external tables like @foo and @bar
1057            # can be joined in a query with a comma separator, as well as closing paren
1058            # in case of subqueries
1059            while self._is_connected() and not self._match_set(
1060                (TokenType.COMMA, TokenType.L_PAREN, TokenType.R_PAREN), advance=False
1061            ):
1062                self._advance_any(ignore_reserved=True)
1063
1064            return exp.var(self._find_sql(start, self._prev))
1065
1066        def _parse_lambda_arg(self) -> t.Optional[exp.Expression]:
1067            this = super()._parse_lambda_arg()
1068
1069            if not this:
1070                return this
1071
1072            typ = self._parse_types()
1073
1074            if typ:
1075                return self.expression(exp.Cast, this=this, to=typ)
1076
1077            return this
1078
1079        def _parse_foreign_key(self) -> exp.ForeignKey:
1080            # inlineFK, the REFERENCES columns are implied
1081            if self._match(TokenType.REFERENCES, advance=False):
1082                return self.expression(exp.ForeignKey)
1083
1084            # outoflineFK, explicitly names the columns
1085            return super()._parse_foreign_key()
1086
1087        def _parse_file_format_property(self) -> exp.FileFormatProperty:
1088            self._match(TokenType.EQ)
1089            if self._match(TokenType.L_PAREN, advance=False):
1090                expressions = self._parse_wrapped_options()
1091            else:
1092                expressions = [self._parse_format_name()]
1093
1094            return self.expression(
1095                exp.FileFormatProperty,
1096                expressions=expressions,
1097            )
1098
1099        def _parse_credentials_property(self) -> exp.CredentialsProperty:
1100            return self.expression(
1101                exp.CredentialsProperty,
1102                expressions=self._parse_wrapped_options(),
1103            )
1104
1105        def _parse_semantic_view(self) -> exp.SemanticView:
1106            kwargs: t.Dict[str, t.Any] = {"this": self._parse_table_parts()}
1107
1108            while self._curr and not self._match(TokenType.R_PAREN, advance=False):
1109                if self._match_text_seq("DIMENSIONS"):
1110                    kwargs["dimensions"] = self._parse_csv(self._parse_disjunction)
1111                if self._match_text_seq("METRICS"):
1112                    kwargs["metrics"] = self._parse_csv(self._parse_disjunction)
1113                if self._match_text_seq("WHERE"):
1114                    kwargs["where"] = self._parse_expression()
1115
1116            return self.expression(exp.SemanticView, **kwargs)
1117
1118    class Tokenizer(tokens.Tokenizer):
1119        STRING_ESCAPES = ["\\", "'"]
1120        HEX_STRINGS = [("x'", "'"), ("X'", "'")]
1121        RAW_STRINGS = ["$$"]
1122        COMMENTS = ["--", "//", ("/*", "*/")]
1123        NESTED_COMMENTS = False
1124
1125        KEYWORDS = {
1126            **tokens.Tokenizer.KEYWORDS,
1127            "FILE://": TokenType.URI_START,
1128            "BYTEINT": TokenType.INT,
1129            "EXCLUDE": TokenType.EXCEPT,
1130            "FILE FORMAT": TokenType.FILE_FORMAT,
1131            "GET": TokenType.GET,
1132            "MATCH_CONDITION": TokenType.MATCH_CONDITION,
1133            "MATCH_RECOGNIZE": TokenType.MATCH_RECOGNIZE,
1134            "MINUS": TokenType.EXCEPT,
1135            "NCHAR VARYING": TokenType.VARCHAR,
1136            "PUT": TokenType.PUT,
1137            "REMOVE": TokenType.COMMAND,
1138            "RM": TokenType.COMMAND,
1139            "SAMPLE": TokenType.TABLE_SAMPLE,
1140            "SEMANTIC VIEW": TokenType.SEMANTIC_VIEW,
1141            "SQL_DOUBLE": TokenType.DOUBLE,
1142            "SQL_VARCHAR": TokenType.VARCHAR,
1143            "STORAGE INTEGRATION": TokenType.STORAGE_INTEGRATION,
1144            "TAG": TokenType.TAG,
1145            "TIMESTAMP_TZ": TokenType.TIMESTAMPTZ,
1146            "TOP": TokenType.TOP,
1147            "WAREHOUSE": TokenType.WAREHOUSE,
1148            "STAGE": TokenType.STAGE,
1149            "STREAMLIT": TokenType.STREAMLIT,
1150        }
1151        KEYWORDS.pop("/*+")
1152
1153        SINGLE_TOKENS = {
1154            **tokens.Tokenizer.SINGLE_TOKENS,
1155            "$": TokenType.PARAMETER,
1156        }
1157
1158        VAR_SINGLE_TOKENS = {"$"}
1159
1160        COMMANDS = tokens.Tokenizer.COMMANDS - {TokenType.SHOW}
1161
1162    class Generator(generator.Generator):
1163        PARAMETER_TOKEN = "$"
1164        MATCHED_BY_SOURCE = False
1165        SINGLE_STRING_INTERVAL = True
1166        JOIN_HINTS = False
1167        TABLE_HINTS = False
1168        QUERY_HINTS = False
1169        AGGREGATE_FILTER_SUPPORTED = False
1170        SUPPORTS_TABLE_COPY = False
1171        COLLATE_IS_FUNC = True
1172        LIMIT_ONLY_LITERALS = True
1173        JSON_KEY_VALUE_PAIR_SEP = ","
1174        INSERT_OVERWRITE = " OVERWRITE INTO"
1175        STRUCT_DELIMITER = ("(", ")")
1176        COPY_PARAMS_ARE_WRAPPED = False
1177        COPY_PARAMS_EQ_REQUIRED = True
1178        STAR_EXCEPT = "EXCLUDE"
1179        SUPPORTS_EXPLODING_PROJECTIONS = False
1180        ARRAY_CONCAT_IS_VAR_LEN = False
1181        SUPPORTS_CONVERT_TIMEZONE = True
1182        EXCEPT_INTERSECT_SUPPORT_ALL_CLAUSE = False
1183        SUPPORTS_MEDIAN = True
1184        ARRAY_SIZE_NAME = "ARRAY_SIZE"
1185        SUPPORTS_DECODE_CASE = True
1186        IS_BOOL_ALLOWED = False
1187
1188        TRANSFORMS = {
1189            **generator.Generator.TRANSFORMS,
1190            exp.ApproxDistinct: rename_func("APPROX_COUNT_DISTINCT"),
1191            exp.ArgMax: rename_func("MAX_BY"),
1192            exp.ArgMin: rename_func("MIN_BY"),
1193            exp.ArrayConcat: lambda self, e: self.arrayconcat_sql(e, name="ARRAY_CAT"),
1194            exp.ArrayContains: lambda self, e: self.func("ARRAY_CONTAINS", e.expression, e.this),
1195            exp.ArrayIntersect: rename_func("ARRAY_INTERSECTION"),
1196            exp.AtTimeZone: lambda self, e: self.func(
1197                "CONVERT_TIMEZONE", e.args.get("zone"), e.this
1198            ),
1199            exp.BitwiseOr: rename_func("BITOR"),
1200            exp.BitwiseXor: rename_func("BITXOR"),
1201            exp.BitwiseLeftShift: rename_func("BITSHIFTLEFT"),
1202            exp.BitwiseRightShift: rename_func("BITSHIFTRIGHT"),
1203            exp.Create: transforms.preprocess([_flatten_structured_types_unless_iceberg]),
1204            exp.DateAdd: date_delta_sql("DATEADD"),
1205            exp.DateDiff: date_delta_sql("DATEDIFF"),
1206            exp.DatetimeAdd: date_delta_sql("TIMESTAMPADD"),
1207            exp.DatetimeDiff: timestampdiff_sql,
1208            exp.DateStrToDate: datestrtodate_sql,
1209            exp.DayOfMonth: rename_func("DAYOFMONTH"),
1210            exp.DayOfWeek: rename_func("DAYOFWEEK"),
1211            exp.DayOfWeekIso: rename_func("DAYOFWEEKISO"),
1212            exp.DayOfYear: rename_func("DAYOFYEAR"),
1213            exp.Explode: rename_func("FLATTEN"),
1214            exp.Extract: lambda self, e: self.func(
1215                "DATE_PART", map_date_part(e.this, self.dialect), e.expression
1216            ),
1217            exp.FileFormatProperty: lambda self,
1218            e: f"FILE_FORMAT=({self.expressions(e, 'expressions', sep=' ')})",
1219            exp.FromTimeZone: lambda self, e: self.func(
1220                "CONVERT_TIMEZONE", e.args.get("zone"), "'UTC'", e.this
1221            ),
1222            exp.GenerateSeries: lambda self, e: self.func(
1223                "ARRAY_GENERATE_RANGE", e.args["start"], e.args["end"] + 1, e.args.get("step")
1224            ),
1225            exp.GetExtract: rename_func("GET"),
1226            exp.GroupConcat: lambda self, e: groupconcat_sql(self, e, sep=""),
1227            exp.If: if_sql(name="IFF", false_value="NULL"),
1228            exp.JSONExtractArray: _json_extract_value_array_sql,
1229            exp.JSONExtractScalar: lambda self, e: self.func(
1230                "JSON_EXTRACT_PATH_TEXT", e.this, e.expression
1231            ),
1232            exp.JSONObject: lambda self, e: self.func("OBJECT_CONSTRUCT_KEEP_NULL", *e.expressions),
1233            exp.JSONPathRoot: lambda *_: "",
1234            exp.JSONValueArray: _json_extract_value_array_sql,
1235            exp.Levenshtein: unsupported_args("ins_cost", "del_cost", "sub_cost")(
1236                rename_func("EDITDISTANCE")
1237            ),
1238            exp.LocationProperty: lambda self, e: f"LOCATION={self.sql(e, 'this')}",
1239            exp.LogicalAnd: rename_func("BOOLAND_AGG"),
1240            exp.LogicalOr: rename_func("BOOLOR_AGG"),
1241            exp.Map: lambda self, e: var_map_sql(self, e, "OBJECT_CONSTRUCT"),
1242            exp.MakeInterval: no_make_interval_sql,
1243            exp.Max: max_or_greatest,
1244            exp.Min: min_or_least,
1245            exp.ParseJSON: lambda self, e: self.func(
1246                "TRY_PARSE_JSON" if e.args.get("safe") else "PARSE_JSON", e.this
1247            ),
1248            exp.PartitionedByProperty: lambda self, e: f"PARTITION BY {self.sql(e, 'this')}",
1249            exp.PercentileCont: transforms.preprocess(
1250                [transforms.add_within_group_for_percentiles]
1251            ),
1252            exp.PercentileDisc: transforms.preprocess(
1253                [transforms.add_within_group_for_percentiles]
1254            ),
1255            exp.Pivot: transforms.preprocess([_unqualify_pivot_columns]),
1256            exp.RegexpExtract: _regexpextract_sql,
1257            exp.RegexpExtractAll: _regexpextract_sql,
1258            exp.RegexpILike: _regexpilike_sql,
1259            exp.Rand: rename_func("RANDOM"),
1260            exp.Select: transforms.preprocess(
1261                [
1262                    transforms.eliminate_window_clause,
1263                    transforms.eliminate_distinct_on,
1264                    transforms.explode_projection_to_unnest(),
1265                    transforms.eliminate_semi_and_anti_joins,
1266                    _transform_generate_date_array,
1267                    _qualify_unnested_columns,
1268                    _eliminate_dot_variant_lookup,
1269                ]
1270            ),
1271            exp.SHA: rename_func("SHA1"),
1272            exp.StarMap: rename_func("OBJECT_CONSTRUCT"),
1273            exp.StartsWith: rename_func("STARTSWITH"),
1274            exp.EndsWith: rename_func("ENDSWITH"),
1275            exp.StrPosition: lambda self, e: strposition_sql(
1276                self, e, func_name="CHARINDEX", supports_position=True
1277            ),
1278            exp.StrToDate: lambda self, e: self.func("DATE", e.this, self.format_time(e)),
1279            exp.StringToArray: rename_func("STRTOK_TO_ARRAY"),
1280            exp.Stuff: rename_func("INSERT"),
1281            exp.StPoint: rename_func("ST_MAKEPOINT"),
1282            exp.TimeAdd: date_delta_sql("TIMEADD"),
1283            exp.Timestamp: no_timestamp_sql,
1284            exp.TimestampAdd: date_delta_sql("TIMESTAMPADD"),
1285            exp.TimestampDiff: lambda self, e: self.func(
1286                "TIMESTAMPDIFF", e.unit, e.expression, e.this
1287            ),
1288            exp.TimestampTrunc: timestamptrunc_sql(),
1289            exp.TimeStrToTime: timestrtotime_sql,
1290            exp.TimeToUnix: lambda self, e: f"EXTRACT(epoch_second FROM {self.sql(e, 'this')})",
1291            exp.ToArray: rename_func("TO_ARRAY"),
1292            exp.ToChar: lambda self, e: self.function_fallback_sql(e),
1293            exp.ToDouble: rename_func("TO_DOUBLE"),
1294            exp.TsOrDsAdd: date_delta_sql("DATEADD", cast=True),
1295            exp.TsOrDsDiff: date_delta_sql("DATEDIFF"),
1296            exp.TsOrDsToDate: lambda self, e: self.func(
1297                "TRY_TO_DATE" if e.args.get("safe") else "TO_DATE", e.this, self.format_time(e)
1298            ),
1299            exp.TsOrDsToTime: lambda self, e: self.func(
1300                "TRY_TO_TIME" if e.args.get("safe") else "TO_TIME", e.this, self.format_time(e)
1301            ),
1302            exp.Unhex: rename_func("HEX_DECODE_BINARY"),
1303            exp.UnixToTime: rename_func("TO_TIMESTAMP"),
1304            exp.Uuid: rename_func("UUID_STRING"),
1305            exp.VarMap: lambda self, e: var_map_sql(self, e, "OBJECT_CONSTRUCT"),
1306            exp.WeekOfYear: rename_func("WEEKOFYEAR"),
1307            exp.Xor: rename_func("BOOLXOR"),
1308        }
1309
1310        SUPPORTED_JSON_PATH_PARTS = {
1311            exp.JSONPathKey,
1312            exp.JSONPathRoot,
1313            exp.JSONPathSubscript,
1314        }
1315
1316        TYPE_MAPPING = {
1317            **generator.Generator.TYPE_MAPPING,
1318            exp.DataType.Type.NESTED: "OBJECT",
1319            exp.DataType.Type.STRUCT: "OBJECT",
1320            exp.DataType.Type.BIGDECIMAL: "DOUBLE",
1321        }
1322
1323        TOKEN_MAPPING = {
1324            TokenType.AUTO_INCREMENT: "AUTOINCREMENT",
1325        }
1326
1327        PROPERTIES_LOCATION = {
1328            **generator.Generator.PROPERTIES_LOCATION,
1329            exp.CredentialsProperty: exp.Properties.Location.POST_WITH,
1330            exp.LocationProperty: exp.Properties.Location.POST_WITH,
1331            exp.PartitionedByProperty: exp.Properties.Location.POST_SCHEMA,
1332            exp.SetProperty: exp.Properties.Location.UNSUPPORTED,
1333            exp.VolatileProperty: exp.Properties.Location.UNSUPPORTED,
1334        }
1335
1336        UNSUPPORTED_VALUES_EXPRESSIONS = {
1337            exp.Map,
1338            exp.StarMap,
1339            exp.Struct,
1340            exp.VarMap,
1341        }
1342
1343        RESPECT_IGNORE_NULLS_UNSUPPORTED_EXPRESSIONS = (exp.ArrayAgg,)
1344
1345        def with_properties(self, properties: exp.Properties) -> str:
1346            return self.properties(properties, wrapped=False, prefix=self.sep(""), sep=" ")
1347
1348        def values_sql(self, expression: exp.Values, values_as_table: bool = True) -> str:
1349            if expression.find(*self.UNSUPPORTED_VALUES_EXPRESSIONS):
1350                values_as_table = False
1351
1352            return super().values_sql(expression, values_as_table=values_as_table)
1353
1354        def datatype_sql(self, expression: exp.DataType) -> str:
1355            expressions = expression.expressions
1356            if (
1357                expressions
1358                and expression.is_type(*exp.DataType.STRUCT_TYPES)
1359                and any(isinstance(field_type, exp.DataType) for field_type in expressions)
1360            ):
1361                # The correct syntax is OBJECT [ (<key> <value_type [NOT NULL] [, ...]) ]
1362                return "OBJECT"
1363
1364            return super().datatype_sql(expression)
1365
1366        def tonumber_sql(self, expression: exp.ToNumber) -> str:
1367            return self.func(
1368                "TO_NUMBER",
1369                expression.this,
1370                expression.args.get("format"),
1371                expression.args.get("precision"),
1372                expression.args.get("scale"),
1373            )
1374
1375        def timestampfromparts_sql(self, expression: exp.TimestampFromParts) -> str:
1376            milli = expression.args.get("milli")
1377            if milli is not None:
1378                milli_to_nano = milli.pop() * exp.Literal.number(1000000)
1379                expression.set("nano", milli_to_nano)
1380
1381            return rename_func("TIMESTAMP_FROM_PARTS")(self, expression)
1382
1383        def cast_sql(self, expression: exp.Cast, safe_prefix: t.Optional[str] = None) -> str:
1384            if expression.is_type(exp.DataType.Type.GEOGRAPHY):
1385                return self.func("TO_GEOGRAPHY", expression.this)
1386            if expression.is_type(exp.DataType.Type.GEOMETRY):
1387                return self.func("TO_GEOMETRY", expression.this)
1388
1389            return super().cast_sql(expression, safe_prefix=safe_prefix)
1390
1391        def trycast_sql(self, expression: exp.TryCast) -> str:
1392            value = expression.this
1393
1394            if value.type is None:
1395                from sqlglot.optimizer.annotate_types import annotate_types
1396
1397                value = annotate_types(value, dialect=self.dialect)
1398
1399            # Snowflake requires that TRY_CAST's value be a string
1400            # If TRY_CAST is being roundtripped (since Snowflake is the only dialect that sets "requires_string") or
1401            # if we can deduce that the value is a string, then we can generate TRY_CAST
1402            if expression.args.get("requires_string") or value.is_type(*exp.DataType.TEXT_TYPES):
1403                return super().trycast_sql(expression)
1404
1405            return self.cast_sql(expression)
1406
1407        def log_sql(self, expression: exp.Log) -> str:
1408            if not expression.expression:
1409                return self.func("LN", expression.this)
1410
1411            return super().log_sql(expression)
1412
1413        def unnest_sql(self, expression: exp.Unnest) -> str:
1414            unnest_alias = expression.args.get("alias")
1415            offset = expression.args.get("offset")
1416
1417            unnest_alias_columns = unnest_alias.columns if unnest_alias else []
1418            value = seq_get(unnest_alias_columns, 0) or exp.to_identifier("value")
1419
1420            columns = [
1421                exp.to_identifier("seq"),
1422                exp.to_identifier("key"),
1423                exp.to_identifier("path"),
1424                offset.pop() if isinstance(offset, exp.Expression) else exp.to_identifier("index"),
1425                value,
1426                exp.to_identifier("this"),
1427            ]
1428
1429            if unnest_alias:
1430                unnest_alias.set("columns", columns)
1431            else:
1432                unnest_alias = exp.TableAlias(this="_u", columns=columns)
1433
1434            table_input = self.sql(expression.expressions[0])
1435            if not table_input.startswith("INPUT =>"):
1436                table_input = f"INPUT => {table_input}"
1437
1438            expression_parent = expression.parent
1439
1440            explode = (
1441                f"FLATTEN({table_input})"
1442                if isinstance(expression_parent, exp.Lateral)
1443                else f"TABLE(FLATTEN({table_input}))"
1444            )
1445            alias = self.sql(unnest_alias)
1446            alias = f" AS {alias}" if alias else ""
1447            value = (
1448                ""
1449                if isinstance(expression_parent, (exp.From, exp.Join, exp.Lateral))
1450                else f"{value} FROM "
1451            )
1452
1453            return f"{value}{explode}{alias}"
1454
1455        def show_sql(self, expression: exp.Show) -> str:
1456            terse = "TERSE " if expression.args.get("terse") else ""
1457            history = " HISTORY" if expression.args.get("history") else ""
1458            like = self.sql(expression, "like")
1459            like = f" LIKE {like}" if like else ""
1460
1461            scope = self.sql(expression, "scope")
1462            scope = f" {scope}" if scope else ""
1463
1464            scope_kind = self.sql(expression, "scope_kind")
1465            if scope_kind:
1466                scope_kind = f" IN {scope_kind}"
1467
1468            starts_with = self.sql(expression, "starts_with")
1469            if starts_with:
1470                starts_with = f" STARTS WITH {starts_with}"
1471
1472            limit = self.sql(expression, "limit")
1473
1474            from_ = self.sql(expression, "from")
1475            if from_:
1476                from_ = f" FROM {from_}"
1477
1478            privileges = self.expressions(expression, key="privileges", flat=True)
1479            privileges = f" WITH PRIVILEGES {privileges}" if privileges else ""
1480
1481            return f"SHOW {terse}{expression.name}{history}{like}{scope_kind}{scope}{starts_with}{limit}{from_}{privileges}"
1482
1483        def describe_sql(self, expression: exp.Describe) -> str:
1484            # Default to table if kind is unknown
1485            kind_value = expression.args.get("kind") or "TABLE"
1486            kind = f" {kind_value}" if kind_value else ""
1487            this = f" {self.sql(expression, 'this')}"
1488            expressions = self.expressions(expression, flat=True)
1489            expressions = f" {expressions}" if expressions else ""
1490            return f"DESCRIBE{kind}{this}{expressions}"
1491
1492        def generatedasidentitycolumnconstraint_sql(
1493            self, expression: exp.GeneratedAsIdentityColumnConstraint
1494        ) -> str:
1495            start = expression.args.get("start")
1496            start = f" START {start}" if start else ""
1497            increment = expression.args.get("increment")
1498            increment = f" INCREMENT {increment}" if increment else ""
1499
1500            order = expression.args.get("order")
1501            if order is not None:
1502                order_clause = " ORDER" if order else " NOORDER"
1503            else:
1504                order_clause = ""
1505
1506            return f"AUTOINCREMENT{start}{increment}{order_clause}"
1507
1508        def cluster_sql(self, expression: exp.Cluster) -> str:
1509            return f"CLUSTER BY ({self.expressions(expression, flat=True)})"
1510
1511        def struct_sql(self, expression: exp.Struct) -> str:
1512            keys = []
1513            values = []
1514
1515            for i, e in enumerate(expression.expressions):
1516                if isinstance(e, exp.PropertyEQ):
1517                    keys.append(
1518                        exp.Literal.string(e.name) if isinstance(e.this, exp.Identifier) else e.this
1519                    )
1520                    values.append(e.expression)
1521                else:
1522                    keys.append(exp.Literal.string(f"_{i}"))
1523                    values.append(e)
1524
1525            return self.func("OBJECT_CONSTRUCT", *flatten(zip(keys, values)))
1526
1527        @unsupported_args("weight", "accuracy")
1528        def approxquantile_sql(self, expression: exp.ApproxQuantile) -> str:
1529            return self.func("APPROX_PERCENTILE", expression.this, expression.args.get("quantile"))
1530
1531        def alterset_sql(self, expression: exp.AlterSet) -> str:
1532            exprs = self.expressions(expression, flat=True)
1533            exprs = f" {exprs}" if exprs else ""
1534            file_format = self.expressions(expression, key="file_format", flat=True, sep=" ")
1535            file_format = f" STAGE_FILE_FORMAT = ({file_format})" if file_format else ""
1536            copy_options = self.expressions(expression, key="copy_options", flat=True, sep=" ")
1537            copy_options = f" STAGE_COPY_OPTIONS = ({copy_options})" if copy_options else ""
1538            tag = self.expressions(expression, key="tag", flat=True)
1539            tag = f" TAG {tag}" if tag else ""
1540
1541            return f"SET{exprs}{file_format}{copy_options}{tag}"
1542
1543        def strtotime_sql(self, expression: exp.StrToTime):
1544            safe_prefix = "TRY_" if expression.args.get("safe") else ""
1545            return self.func(
1546                f"{safe_prefix}TO_TIMESTAMP", expression.this, self.format_time(expression)
1547            )
1548
1549        def timestampsub_sql(self, expression: exp.TimestampSub):
1550            return self.sql(
1551                exp.TimestampAdd(
1552                    this=expression.this,
1553                    expression=expression.expression * -1,
1554                    unit=expression.unit,
1555                )
1556            )
1557
1558        def jsonextract_sql(self, expression: exp.JSONExtract):
1559            this = expression.this
1560
1561            # JSON strings are valid coming from other dialects such as BQ so
1562            # for these cases we PARSE_JSON preemptively
1563            if not isinstance(this, (exp.ParseJSON, exp.JSONExtract)) and not expression.args.get(
1564                "requires_json"
1565            ):
1566                this = exp.ParseJSON(this=this)
1567
1568            return self.func(
1569                "GET_PATH",
1570                this,
1571                expression.expression,
1572            )
1573
1574        def timetostr_sql(self, expression: exp.TimeToStr) -> str:
1575            this = expression.this
1576            if this.is_string:
1577                this = exp.cast(this, exp.DataType.Type.TIMESTAMP)
1578
1579            return self.func("TO_CHAR", this, self.format_time(expression))
1580
1581        def datesub_sql(self, expression: exp.DateSub) -> str:
1582            value = expression.expression
1583            if value:
1584                value.replace(value * (-1))
1585            else:
1586                self.unsupported("DateSub cannot be transpiled if the subtracted count is unknown")
1587
1588            return date_delta_sql("DATEADD")(self, expression)
1589
1590        def select_sql(self, expression: exp.Select) -> str:
1591            limit = expression.args.get("limit")
1592            offset = expression.args.get("offset")
1593            if offset and not limit:
1594                expression.limit(exp.Null(), copy=False)
1595            return super().select_sql(expression)
1596
1597        def createable_sql(self, expression: exp.Create, locations: t.DefaultDict) -> str:
1598            is_materialized = expression.find(exp.MaterializedProperty)
1599            copy_grants_property = expression.find(exp.CopyGrantsProperty)
1600
1601            if expression.kind == "VIEW" and is_materialized and copy_grants_property:
1602                # For materialized views, COPY GRANTS is located *before* the columns list
1603                # This is in contrast to normal views where COPY GRANTS is located *after* the columns list
1604                # We default CopyGrantsProperty to POST_SCHEMA which means we need to output it POST_NAME if a materialized view is detected
1605                # ref: https://docs.snowflake.com/en/sql-reference/sql/create-materialized-view#syntax
1606                # ref: https://docs.snowflake.com/en/sql-reference/sql/create-view#syntax
1607                post_schema_properties = locations[exp.Properties.Location.POST_SCHEMA]
1608                post_schema_properties.pop(post_schema_properties.index(copy_grants_property))
1609
1610                this_name = self.sql(expression.this, "this")
1611                copy_grants = self.sql(copy_grants_property)
1612                this_schema = self.schema_columns_sql(expression.this)
1613                this_schema = f"{self.sep()}{this_schema}" if this_schema else ""
1614
1615                return f"{this_name}{self.sep()}{copy_grants}{this_schema}"
1616
1617            return super().createable_sql(expression, locations)
1618
1619        def arrayagg_sql(self, expression: exp.ArrayAgg) -> str:
1620            this = expression.this
1621
1622            # If an ORDER BY clause is present, we need to remove it from ARRAY_AGG
1623            # and add it later as part of the WITHIN GROUP clause
1624            order = this if isinstance(this, exp.Order) else None
1625            if order:
1626                expression.set("this", order.this.pop())
1627
1628            expr_sql = super().arrayagg_sql(expression)
1629
1630            if order:
1631                expr_sql = self.sql(exp.WithinGroup(this=expr_sql, expression=order))
1632
1633            return expr_sql
1634
1635        def array_sql(self, expression: exp.Array) -> str:
1636            expressions = expression.expressions
1637
1638            first_expr = seq_get(expressions, 0)
1639            if isinstance(first_expr, exp.Select):
1640                # SELECT AS STRUCT foo AS alias_foo -> ARRAY_AGG(OBJECT_CONSTRUCT('alias_foo', foo))
1641                if first_expr.text("kind").upper() == "STRUCT":
1642                    object_construct_args = []
1643                    for expr in first_expr.expressions:
1644                        # Alias case: SELECT AS STRUCT foo AS alias_foo -> OBJECT_CONSTRUCT('alias_foo', foo)
1645                        # Column case: SELECT AS STRUCT foo -> OBJECT_CONSTRUCT('foo', foo)
1646                        name = expr.this if isinstance(expr, exp.Alias) else expr
1647
1648                        object_construct_args.extend([exp.Literal.string(expr.alias_or_name), name])
1649
1650                    array_agg = exp.ArrayAgg(
1651                        this=_build_object_construct(args=object_construct_args)
1652                    )
1653
1654                    first_expr.set("kind", None)
1655                    first_expr.set("expressions", [array_agg])
1656
1657                    return self.sql(first_expr.subquery())
1658
1659            return inline_array_sql(self, expression)
1660
1661        def currentdate_sql(self, expression: exp.CurrentDate) -> str:
1662            zone = self.sql(expression, "this")
1663            if not zone:
1664                return super().currentdate_sql(expression)
1665
1666            expr = exp.Cast(
1667                this=exp.ConvertTimezone(target_tz=zone, timestamp=exp.CurrentTimestamp()),
1668                to=exp.DataType(this=exp.DataType.Type.DATE),
1669            )
1670            return self.sql(expr)
1671
1672        def dot_sql(self, expression: exp.Dot) -> str:
1673            this = expression.this
1674
1675            if not this.type:
1676                from sqlglot.optimizer.annotate_types import annotate_types
1677
1678                this = annotate_types(this, dialect=self.dialect)
1679
1680            if not isinstance(this, exp.Dot) and this.is_type(exp.DataType.Type.STRUCT):
1681                # Generate colon notation for the top level STRUCT
1682                return f"{self.sql(this)}:{self.sql(expression, 'expression')}"
1683
1684            return super().dot_sql(expression)