sqlglot.dialects.tsql

   1from __future__ import annotations
   2
   3import datetime
   4import re
   5import typing as t
   6from functools import partial, reduce
   7
   8from sqlglot import exp, generator, parser, tokens, transforms
   9from sqlglot.dialects.dialect import (
  10    Dialect,
  11    NormalizationStrategy,
  12    any_value_to_max_sql,
  13    date_delta_sql,
  14    datestrtodate_sql,
  15    generatedasidentitycolumnconstraint_sql,
  16    max_or_greatest,
  17    min_or_least,
  18    build_date_delta,
  19    rename_func,
  20    trim_sql,
  21    timestrtotime_sql,
  22)
  23from sqlglot.helper import seq_get
  24from sqlglot.parser import build_coalesce
  25from sqlglot.time import format_time
  26from sqlglot.tokens import TokenType
  27
  28if t.TYPE_CHECKING:
  29    from sqlglot._typing import E
  30
  31FULL_FORMAT_TIME_MAPPING = {
  32    "weekday": "%A",
  33    "dw": "%A",
  34    "w": "%A",
  35    "month": "%B",
  36    "mm": "%B",
  37    "m": "%B",
  38}
  39
  40DATE_DELTA_INTERVAL = {
  41    "year": "year",
  42    "yyyy": "year",
  43    "yy": "year",
  44    "quarter": "quarter",
  45    "qq": "quarter",
  46    "q": "quarter",
  47    "month": "month",
  48    "mm": "month",
  49    "m": "month",
  50    "week": "week",
  51    "ww": "week",
  52    "wk": "week",
  53    "day": "day",
  54    "dd": "day",
  55    "d": "day",
  56}
  57
  58
  59DATE_FMT_RE = re.compile("([dD]{1,2})|([mM]{1,2})|([yY]{1,4})|([hH]{1,2})|([sS]{1,2})")
  60
  61# N = Numeric, C=Currency
  62TRANSPILE_SAFE_NUMBER_FMT = {"N", "C"}
  63
  64DEFAULT_START_DATE = datetime.date(1900, 1, 1)
  65
  66BIT_TYPES = {exp.EQ, exp.NEQ, exp.Is, exp.In, exp.Select, exp.Alias}
  67
  68# Unsupported options:
  69# - OPTIMIZE FOR ( @variable_name { UNKNOWN | = <literal_constant> } [ , ...n ] )
  70# - TABLE HINT
  71OPTIONS: parser.OPTIONS_TYPE = {
  72    **dict.fromkeys(
  73        (
  74            "DISABLE_OPTIMIZED_PLAN_FORCING",
  75            "FAST",
  76            "IGNORE_NONCLUSTERED_COLUMNSTORE_INDEX",
  77            "LABEL",
  78            "MAXDOP",
  79            "MAXRECURSION",
  80            "MAX_GRANT_PERCENT",
  81            "MIN_GRANT_PERCENT",
  82            "NO_PERFORMANCE_SPOOL",
  83            "QUERYTRACEON",
  84            "RECOMPILE",
  85        ),
  86        tuple(),
  87    ),
  88    "CONCAT": ("UNION",),
  89    "DISABLE": ("EXTERNALPUSHDOWN", "SCALEOUTEXECUTION"),
  90    "EXPAND": ("VIEWS",),
  91    "FORCE": ("EXTERNALPUSHDOWN", "ORDER", "SCALEOUTEXECUTION"),
  92    "HASH": ("GROUP", "JOIN", "UNION"),
  93    "KEEP": ("PLAN",),
  94    "KEEPFIXED": ("PLAN",),
  95    "LOOP": ("JOIN",),
  96    "MERGE": ("JOIN", "UNION"),
  97    "OPTIMIZE": (("FOR", "UNKNOWN"),),
  98    "ORDER": ("GROUP",),
  99    "PARAMETERIZATION": ("FORCED", "SIMPLE"),
 100    "ROBUST": ("PLAN",),
 101    "USE": ("PLAN",),
 102}
 103
 104OPTIONS_THAT_REQUIRE_EQUAL = ("MAX_GRANT_PERCENT", "MIN_GRANT_PERCENT", "LABEL")
 105
 106
 107def _build_formatted_time(
 108    exp_class: t.Type[E], full_format_mapping: t.Optional[bool] = None
 109) -> t.Callable[[t.List], E]:
 110    def _builder(args: t.List) -> E:
 111        assert len(args) == 2
 112
 113        return exp_class(
 114            this=exp.cast(args[1], exp.DataType.Type.DATETIME2),
 115            format=exp.Literal.string(
 116                format_time(
 117                    args[0].name.lower(),
 118                    (
 119                        {**TSQL.TIME_MAPPING, **FULL_FORMAT_TIME_MAPPING}
 120                        if full_format_mapping
 121                        else TSQL.TIME_MAPPING
 122                    ),
 123                )
 124            ),
 125        )
 126
 127    return _builder
 128
 129
 130def _build_format(args: t.List) -> exp.NumberToStr | exp.TimeToStr:
 131    this = seq_get(args, 0)
 132    fmt = seq_get(args, 1)
 133    culture = seq_get(args, 2)
 134
 135    number_fmt = fmt and (fmt.name in TRANSPILE_SAFE_NUMBER_FMT or not DATE_FMT_RE.search(fmt.name))
 136
 137    if number_fmt:
 138        return exp.NumberToStr(this=this, format=fmt, culture=culture)
 139
 140    if fmt:
 141        fmt = exp.Literal.string(
 142            format_time(fmt.name, TSQL.FORMAT_TIME_MAPPING)
 143            if len(fmt.name) == 1
 144            else format_time(fmt.name, TSQL.TIME_MAPPING)
 145        )
 146
 147    return exp.TimeToStr(this=this, format=fmt, culture=culture)
 148
 149
 150def _build_eomonth(args: t.List) -> exp.LastDay:
 151    date = exp.TsOrDsToDate(this=seq_get(args, 0))
 152    month_lag = seq_get(args, 1)
 153
 154    if month_lag is None:
 155        this: exp.Expression = date
 156    else:
 157        unit = DATE_DELTA_INTERVAL.get("month")
 158        this = exp.DateAdd(this=date, expression=month_lag, unit=unit and exp.var(unit))
 159
 160    return exp.LastDay(this=this)
 161
 162
 163def _build_hashbytes(args: t.List) -> exp.Expression:
 164    kind, data = args
 165    kind = kind.name.upper() if kind.is_string else ""
 166
 167    if kind == "MD5":
 168        args.pop(0)
 169        return exp.MD5(this=data)
 170    if kind in ("SHA", "SHA1"):
 171        args.pop(0)
 172        return exp.SHA(this=data)
 173    if kind == "SHA2_256":
 174        return exp.SHA2(this=data, length=exp.Literal.number(256))
 175    if kind == "SHA2_512":
 176        return exp.SHA2(this=data, length=exp.Literal.number(512))
 177
 178    return exp.func("HASHBYTES", *args)
 179
 180
 181DATEPART_ONLY_FORMATS = {"DW", "WK", "HOUR", "QUARTER"}
 182
 183
 184def _format_sql(self: TSQL.Generator, expression: exp.NumberToStr | exp.TimeToStr) -> str:
 185    fmt = expression.args["format"]
 186
 187    if not isinstance(expression, exp.NumberToStr):
 188        if fmt.is_string:
 189            mapped_fmt = format_time(fmt.name, TSQL.INVERSE_TIME_MAPPING)
 190
 191            name = (mapped_fmt or "").upper()
 192            if name in DATEPART_ONLY_FORMATS:
 193                return self.func("DATEPART", name, expression.this)
 194
 195            fmt_sql = self.sql(exp.Literal.string(mapped_fmt))
 196        else:
 197            fmt_sql = self.format_time(expression) or self.sql(fmt)
 198    else:
 199        fmt_sql = self.sql(fmt)
 200
 201    return self.func("FORMAT", expression.this, fmt_sql, expression.args.get("culture"))
 202
 203
 204def _string_agg_sql(self: TSQL.Generator, expression: exp.GroupConcat) -> str:
 205    this = expression.this
 206    distinct = expression.find(exp.Distinct)
 207    if distinct:
 208        # exp.Distinct can appear below an exp.Order or an exp.GroupConcat expression
 209        self.unsupported("T-SQL STRING_AGG doesn't support DISTINCT.")
 210        this = distinct.pop().expressions[0]
 211
 212    order = ""
 213    if isinstance(expression.this, exp.Order):
 214        if expression.this.this:
 215            this = expression.this.this.pop()
 216        # Order has a leading space
 217        order = f" WITHIN GROUP ({self.sql(expression.this)[1:]})"
 218
 219    separator = expression.args.get("separator") or exp.Literal.string(",")
 220    return f"STRING_AGG({self.format_args(this, separator)}){order}"
 221
 222
 223def _build_date_delta(
 224    exp_class: t.Type[E], unit_mapping: t.Optional[t.Dict[str, str]] = None
 225) -> t.Callable[[t.List], E]:
 226    def _builder(args: t.List) -> E:
 227        unit = seq_get(args, 0)
 228        if unit and unit_mapping:
 229            unit = exp.var(unit_mapping.get(unit.name.lower(), unit.name))
 230
 231        start_date = seq_get(args, 1)
 232        if start_date and start_date.is_number:
 233            # Numeric types are valid DATETIME values
 234            if start_date.is_int:
 235                adds = DEFAULT_START_DATE + datetime.timedelta(days=start_date.to_py())
 236                start_date = exp.Literal.string(adds.strftime("%F"))
 237            else:
 238                # We currently don't handle float values, i.e. they're not converted to equivalent DATETIMEs.
 239                # This is not a problem when generating T-SQL code, it is when transpiling to other dialects.
 240                return exp_class(this=seq_get(args, 2), expression=start_date, unit=unit)
 241
 242        return exp_class(
 243            this=exp.TimeStrToTime(this=seq_get(args, 2)),
 244            expression=exp.TimeStrToTime(this=start_date),
 245            unit=unit,
 246        )
 247
 248    return _builder
 249
 250
 251def qualify_derived_table_outputs(expression: exp.Expression) -> exp.Expression:
 252    """Ensures all (unnamed) output columns are aliased for CTEs and Subqueries."""
 253    alias = expression.args.get("alias")
 254
 255    if (
 256        isinstance(expression, (exp.CTE, exp.Subquery))
 257        and isinstance(alias, exp.TableAlias)
 258        and not alias.columns
 259    ):
 260        from sqlglot.optimizer.qualify_columns import qualify_outputs
 261
 262        # We keep track of the unaliased column projection indexes instead of the expressions
 263        # themselves, because the latter are going to be replaced by new nodes when the aliases
 264        # are added and hence we won't be able to reach these newly added Alias parents
 265        query = expression.this
 266        unaliased_column_indexes = (
 267            i for i, c in enumerate(query.selects) if isinstance(c, exp.Column) and not c.alias
 268        )
 269
 270        qualify_outputs(query)
 271
 272        # Preserve the quoting information of columns for newly added Alias nodes
 273        query_selects = query.selects
 274        for select_index in unaliased_column_indexes:
 275            alias = query_selects[select_index]
 276            column = alias.this
 277            if isinstance(column.this, exp.Identifier):
 278                alias.args["alias"].set("quoted", column.this.quoted)
 279
 280    return expression
 281
 282
 283# https://learn.microsoft.com/en-us/sql/t-sql/functions/datetimefromparts-transact-sql?view=sql-server-ver16#syntax
 284def _build_datetimefromparts(args: t.List) -> exp.TimestampFromParts:
 285    return exp.TimestampFromParts(
 286        year=seq_get(args, 0),
 287        month=seq_get(args, 1),
 288        day=seq_get(args, 2),
 289        hour=seq_get(args, 3),
 290        min=seq_get(args, 4),
 291        sec=seq_get(args, 5),
 292        milli=seq_get(args, 6),
 293    )
 294
 295
 296# https://learn.microsoft.com/en-us/sql/t-sql/functions/timefromparts-transact-sql?view=sql-server-ver16#syntax
 297def _build_timefromparts(args: t.List) -> exp.TimeFromParts:
 298    return exp.TimeFromParts(
 299        hour=seq_get(args, 0),
 300        min=seq_get(args, 1),
 301        sec=seq_get(args, 2),
 302        fractions=seq_get(args, 3),
 303        precision=seq_get(args, 4),
 304    )
 305
 306
 307def _build_with_arg_as_text(
 308    klass: t.Type[exp.Expression],
 309) -> t.Callable[[t.List[exp.Expression]], exp.Expression]:
 310    def _parse(args: t.List[exp.Expression]) -> exp.Expression:
 311        this = seq_get(args, 0)
 312
 313        if this and not this.is_string:
 314            this = exp.cast(this, exp.DataType.Type.TEXT)
 315
 316        expression = seq_get(args, 1)
 317        kwargs = {"this": this}
 318
 319        if expression:
 320            kwargs["expression"] = expression
 321
 322        return klass(**kwargs)
 323
 324    return _parse
 325
 326
 327# https://learn.microsoft.com/en-us/sql/t-sql/functions/parsename-transact-sql?view=sql-server-ver16
 328def _build_parsename(args: t.List) -> exp.SplitPart | exp.Anonymous:
 329    # PARSENAME(...) will be stored into exp.SplitPart if:
 330    # - All args are literals
 331    # - The part index (2nd arg) is <= 4 (max valid value, otherwise TSQL returns NULL)
 332    if len(args) == 2 and all(isinstance(arg, exp.Literal) for arg in args):
 333        this = args[0]
 334        part_index = args[1]
 335        split_count = len(this.name.split("."))
 336        if split_count <= 4:
 337            return exp.SplitPart(
 338                this=this,
 339                delimiter=exp.Literal.string("."),
 340                part_index=exp.Literal.number(split_count + 1 - part_index.to_py()),
 341            )
 342
 343    return exp.Anonymous(this="PARSENAME", expressions=args)
 344
 345
 346def _build_json_query(args: t.List, dialect: Dialect) -> exp.JSONExtract:
 347    if len(args) == 1:
 348        # The default value for path is '$'. As a result, if you don't provide a
 349        # value for path, JSON_QUERY returns the input expression.
 350        args.append(exp.Literal.string("$"))
 351
 352    return parser.build_extract_json_with_path(exp.JSONExtract)(args, dialect)
 353
 354
 355def _json_extract_sql(
 356    self: TSQL.Generator, expression: exp.JSONExtract | exp.JSONExtractScalar
 357) -> str:
 358    json_query = self.func("JSON_QUERY", expression.this, expression.expression)
 359    json_value = self.func("JSON_VALUE", expression.this, expression.expression)
 360    return self.func("ISNULL", json_query, json_value)
 361
 362
 363def _timestrtotime_sql(self: TSQL.Generator, expression: exp.TimeStrToTime):
 364    sql = timestrtotime_sql(self, expression)
 365    if expression.args.get("zone"):
 366        # If there is a timezone, produce an expression like:
 367        # CAST('2020-01-01 12:13:14-08:00' AS DATETIMEOFFSET) AT TIME ZONE 'UTC'
 368        # If you dont have AT TIME ZONE 'UTC', wrapping that expression in another cast back to DATETIME2 just drops the timezone information
 369        return self.sql(exp.AtTimeZone(this=sql, zone=exp.Literal.string("UTC")))
 370    return sql
 371
 372
 373def _build_datetrunc(args: t.List) -> exp.TimestampTrunc:
 374    unit = seq_get(args, 0)
 375    this = seq_get(args, 1)
 376
 377    if this and this.is_string:
 378        this = exp.cast(this, exp.DataType.Type.DATETIME2)
 379
 380    return exp.TimestampTrunc(this=this, unit=unit)
 381
 382
 383class TSQL(Dialect):
 384    SUPPORTS_SEMI_ANTI_JOIN = False
 385    LOG_BASE_FIRST = False
 386    TYPED_DIVISION = True
 387    CONCAT_COALESCE = True
 388    NORMALIZATION_STRATEGY = NormalizationStrategy.CASE_INSENSITIVE
 389
 390    TIME_FORMAT = "'yyyy-mm-dd hh:mm:ss'"
 391
 392    TIME_MAPPING = {
 393        "year": "%Y",
 394        "dayofyear": "%j",
 395        "day": "%d",
 396        "dy": "%d",
 397        "y": "%Y",
 398        "week": "%W",
 399        "ww": "%W",
 400        "wk": "%W",
 401        "hour": "%h",
 402        "hh": "%I",
 403        "minute": "%M",
 404        "mi": "%M",
 405        "n": "%M",
 406        "second": "%S",
 407        "ss": "%S",
 408        "s": "%-S",
 409        "millisecond": "%f",
 410        "ms": "%f",
 411        "weekday": "%w",
 412        "dw": "%w",
 413        "month": "%m",
 414        "mm": "%M",
 415        "m": "%-M",
 416        "Y": "%Y",
 417        "YYYY": "%Y",
 418        "YY": "%y",
 419        "MMMM": "%B",
 420        "MMM": "%b",
 421        "MM": "%m",
 422        "M": "%-m",
 423        "dddd": "%A",
 424        "dd": "%d",
 425        "d": "%-d",
 426        "HH": "%H",
 427        "H": "%-H",
 428        "h": "%-I",
 429        "ffffff": "%f",
 430        "yyyy": "%Y",
 431        "yy": "%y",
 432    }
 433
 434    CONVERT_FORMAT_MAPPING = {
 435        "0": "%b %d %Y %-I:%M%p",
 436        "1": "%m/%d/%y",
 437        "2": "%y.%m.%d",
 438        "3": "%d/%m/%y",
 439        "4": "%d.%m.%y",
 440        "5": "%d-%m-%y",
 441        "6": "%d %b %y",
 442        "7": "%b %d, %y",
 443        "8": "%H:%M:%S",
 444        "9": "%b %d %Y %-I:%M:%S:%f%p",
 445        "10": "mm-dd-yy",
 446        "11": "yy/mm/dd",
 447        "12": "yymmdd",
 448        "13": "%d %b %Y %H:%M:ss:%f",
 449        "14": "%H:%M:%S:%f",
 450        "20": "%Y-%m-%d %H:%M:%S",
 451        "21": "%Y-%m-%d %H:%M:%S.%f",
 452        "22": "%m/%d/%y %-I:%M:%S %p",
 453        "23": "%Y-%m-%d",
 454        "24": "%H:%M:%S",
 455        "25": "%Y-%m-%d %H:%M:%S.%f",
 456        "100": "%b %d %Y %-I:%M%p",
 457        "101": "%m/%d/%Y",
 458        "102": "%Y.%m.%d",
 459        "103": "%d/%m/%Y",
 460        "104": "%d.%m.%Y",
 461        "105": "%d-%m-%Y",
 462        "106": "%d %b %Y",
 463        "107": "%b %d, %Y",
 464        "108": "%H:%M:%S",
 465        "109": "%b %d %Y %-I:%M:%S:%f%p",
 466        "110": "%m-%d-%Y",
 467        "111": "%Y/%m/%d",
 468        "112": "%Y%m%d",
 469        "113": "%d %b %Y %H:%M:%S:%f",
 470        "114": "%H:%M:%S:%f",
 471        "120": "%Y-%m-%d %H:%M:%S",
 472        "121": "%Y-%m-%d %H:%M:%S.%f",
 473    }
 474
 475    FORMAT_TIME_MAPPING = {
 476        "y": "%B %Y",
 477        "d": "%m/%d/%Y",
 478        "H": "%-H",
 479        "h": "%-I",
 480        "s": "%Y-%m-%d %H:%M:%S",
 481        "D": "%A,%B,%Y",
 482        "f": "%A,%B,%Y %-I:%M %p",
 483        "F": "%A,%B,%Y %-I:%M:%S %p",
 484        "g": "%m/%d/%Y %-I:%M %p",
 485        "G": "%m/%d/%Y %-I:%M:%S %p",
 486        "M": "%B %-d",
 487        "m": "%B %-d",
 488        "O": "%Y-%m-%dT%H:%M:%S",
 489        "u": "%Y-%M-%D %H:%M:%S%z",
 490        "U": "%A, %B %D, %Y %H:%M:%S%z",
 491        "T": "%-I:%M:%S %p",
 492        "t": "%-I:%M",
 493        "Y": "%a %Y",
 494    }
 495
 496    class Tokenizer(tokens.Tokenizer):
 497        IDENTIFIERS = [("[", "]"), '"']
 498        QUOTES = ["'", '"']
 499        HEX_STRINGS = [("0x", ""), ("0X", "")]
 500        VAR_SINGLE_TOKENS = {"@", "$", "#"}
 501
 502        KEYWORDS = {
 503            **tokens.Tokenizer.KEYWORDS,
 504            "CLUSTERED INDEX": TokenType.INDEX,
 505            "DATETIME2": TokenType.DATETIME2,
 506            "DATETIMEOFFSET": TokenType.TIMESTAMPTZ,
 507            "DECLARE": TokenType.DECLARE,
 508            "EXEC": TokenType.COMMAND,
 509            "FOR SYSTEM_TIME": TokenType.TIMESTAMP_SNAPSHOT,
 510            "IMAGE": TokenType.IMAGE,
 511            "MONEY": TokenType.MONEY,
 512            "NONCLUSTERED INDEX": TokenType.INDEX,
 513            "NTEXT": TokenType.TEXT,
 514            "OPTION": TokenType.OPTION,
 515            "OUTPUT": TokenType.RETURNING,
 516            "PRINT": TokenType.COMMAND,
 517            "PROC": TokenType.PROCEDURE,
 518            "REAL": TokenType.FLOAT,
 519            "ROWVERSION": TokenType.ROWVERSION,
 520            "SMALLDATETIME": TokenType.SMALLDATETIME,
 521            "SMALLMONEY": TokenType.SMALLMONEY,
 522            "SQL_VARIANT": TokenType.VARIANT,
 523            "SYSTEM_USER": TokenType.CURRENT_USER,
 524            "TOP": TokenType.TOP,
 525            "TIMESTAMP": TokenType.ROWVERSION,
 526            "TINYINT": TokenType.UTINYINT,
 527            "UNIQUEIDENTIFIER": TokenType.UNIQUEIDENTIFIER,
 528            "UPDATE STATISTICS": TokenType.COMMAND,
 529            "XML": TokenType.XML,
 530        }
 531        KEYWORDS.pop("/*+")
 532
 533        COMMANDS = {*tokens.Tokenizer.COMMANDS, TokenType.END}
 534
 535    class Parser(parser.Parser):
 536        SET_REQUIRES_ASSIGNMENT_DELIMITER = False
 537        LOG_DEFAULTS_TO_LN = True
 538        ALTER_TABLE_ADD_REQUIRED_FOR_EACH_COLUMN = False
 539        STRING_ALIASES = True
 540        NO_PAREN_IF_COMMANDS = False
 541
 542        QUERY_MODIFIER_PARSERS = {
 543            **parser.Parser.QUERY_MODIFIER_PARSERS,
 544            TokenType.OPTION: lambda self: ("options", self._parse_options()),
 545        }
 546
 547        FUNCTIONS = {
 548            **parser.Parser.FUNCTIONS,
 549            "CHARINDEX": lambda args: exp.StrPosition(
 550                this=seq_get(args, 1),
 551                substr=seq_get(args, 0),
 552                position=seq_get(args, 2),
 553            ),
 554            "COUNT": lambda args: exp.Count(
 555                this=seq_get(args, 0), expressions=args[1:], big_int=False
 556            ),
 557            "COUNT_BIG": lambda args: exp.Count(
 558                this=seq_get(args, 0), expressions=args[1:], big_int=True
 559            ),
 560            "DATEADD": build_date_delta(exp.DateAdd, unit_mapping=DATE_DELTA_INTERVAL),
 561            "DATEDIFF": _build_date_delta(exp.DateDiff, unit_mapping=DATE_DELTA_INTERVAL),
 562            "DATENAME": _build_formatted_time(exp.TimeToStr, full_format_mapping=True),
 563            "DATEPART": _build_formatted_time(exp.TimeToStr),
 564            "DATETIMEFROMPARTS": _build_datetimefromparts,
 565            "EOMONTH": _build_eomonth,
 566            "FORMAT": _build_format,
 567            "GETDATE": exp.CurrentTimestamp.from_arg_list,
 568            "HASHBYTES": _build_hashbytes,
 569            "ISNULL": build_coalesce,
 570            "JSON_QUERY": _build_json_query,
 571            "JSON_VALUE": parser.build_extract_json_with_path(exp.JSONExtractScalar),
 572            "LEN": _build_with_arg_as_text(exp.Length),
 573            "LEFT": _build_with_arg_as_text(exp.Left),
 574            "RIGHT": _build_with_arg_as_text(exp.Right),
 575            "PARSENAME": _build_parsename,
 576            "REPLICATE": exp.Repeat.from_arg_list,
 577            "SQUARE": lambda args: exp.Pow(this=seq_get(args, 0), expression=exp.Literal.number(2)),
 578            "SYSDATETIME": exp.CurrentTimestamp.from_arg_list,
 579            "SUSER_NAME": exp.CurrentUser.from_arg_list,
 580            "SUSER_SNAME": exp.CurrentUser.from_arg_list,
 581            "SYSTEM_USER": exp.CurrentUser.from_arg_list,
 582            "TIMEFROMPARTS": _build_timefromparts,
 583            "DATETRUNC": _build_datetrunc,
 584        }
 585
 586        JOIN_HINTS = {"LOOP", "HASH", "MERGE", "REMOTE"}
 587
 588        PROCEDURE_OPTIONS = dict.fromkeys(
 589            ("ENCRYPTION", "RECOMPILE", "SCHEMABINDING", "NATIVE_COMPILATION", "EXECUTE"), tuple()
 590        )
 591
 592        RETURNS_TABLE_TOKENS = parser.Parser.ID_VAR_TOKENS - {
 593            TokenType.TABLE,
 594            *parser.Parser.TYPE_TOKENS,
 595        }
 596
 597        STATEMENT_PARSERS = {
 598            **parser.Parser.STATEMENT_PARSERS,
 599            TokenType.DECLARE: lambda self: self._parse_declare(),
 600        }
 601
 602        RANGE_PARSERS = {
 603            **parser.Parser.RANGE_PARSERS,
 604            TokenType.DCOLON: lambda self, this: self.expression(
 605                exp.ScopeResolution,
 606                this=this,
 607                expression=self._parse_function() or self._parse_var(any_token=True),
 608            ),
 609        }
 610
 611        NO_PAREN_FUNCTION_PARSERS = {
 612            **parser.Parser.NO_PAREN_FUNCTION_PARSERS,
 613            "NEXT": lambda self: self._parse_next_value_for(),
 614        }
 615
 616        # The DCOLON (::) operator serves as a scope resolution (exp.ScopeResolution) operator in T-SQL
 617        COLUMN_OPERATORS = {
 618            **parser.Parser.COLUMN_OPERATORS,
 619            TokenType.DCOLON: lambda self, this, to: self.expression(exp.Cast, this=this, to=to)
 620            if isinstance(to, exp.DataType) and to.this != exp.DataType.Type.USERDEFINED
 621            else self.expression(exp.ScopeResolution, this=this, expression=to),
 622        }
 623
 624        def _parse_dcolon(self) -> t.Optional[exp.Expression]:
 625            # We want to use _parse_types() if the first token after :: is a known type,
 626            # otherwise we could parse something like x::varchar(max) into a function
 627            if self._match_set(self.TYPE_TOKENS, advance=False):
 628                return self._parse_types()
 629
 630            return self._parse_function() or self._parse_types()
 631
 632        def _parse_options(self) -> t.Optional[t.List[exp.Expression]]:
 633            if not self._match(TokenType.OPTION):
 634                return None
 635
 636            def _parse_option() -> t.Optional[exp.Expression]:
 637                option = self._parse_var_from_options(OPTIONS)
 638                if not option:
 639                    return None
 640
 641                self._match(TokenType.EQ)
 642                return self.expression(
 643                    exp.QueryOption, this=option, expression=self._parse_primary_or_var()
 644                )
 645
 646            return self._parse_wrapped_csv(_parse_option)
 647
 648        def _parse_projections(self) -> t.List[exp.Expression]:
 649            """
 650            T-SQL supports the syntax alias = expression in the SELECT's projection list,
 651            so we transform all parsed Selects to convert their EQ projections into Aliases.
 652
 653            See: https://learn.microsoft.com/en-us/sql/t-sql/queries/select-clause-transact-sql?view=sql-server-ver16#syntax
 654            """
 655            return [
 656                (
 657                    exp.alias_(projection.expression, projection.this.this, copy=False)
 658                    if isinstance(projection, exp.EQ) and isinstance(projection.this, exp.Column)
 659                    else projection
 660                )
 661                for projection in super()._parse_projections()
 662            ]
 663
 664        def _parse_commit_or_rollback(self) -> exp.Commit | exp.Rollback:
 665            """Applies to SQL Server and Azure SQL Database
 666            COMMIT [ { TRAN | TRANSACTION }
 667                [ transaction_name | @tran_name_variable ] ]
 668                [ WITH ( DELAYED_DURABILITY = { OFF | ON } ) ]
 669
 670            ROLLBACK { TRAN | TRANSACTION }
 671                [ transaction_name | @tran_name_variable
 672                | savepoint_name | @savepoint_variable ]
 673            """
 674            rollback = self._prev.token_type == TokenType.ROLLBACK
 675
 676            self._match_texts(("TRAN", "TRANSACTION"))
 677            this = self._parse_id_var()
 678
 679            if rollback:
 680                return self.expression(exp.Rollback, this=this)
 681
 682            durability = None
 683            if self._match_pair(TokenType.WITH, TokenType.L_PAREN):
 684                self._match_text_seq("DELAYED_DURABILITY")
 685                self._match(TokenType.EQ)
 686
 687                if self._match_text_seq("OFF"):
 688                    durability = False
 689                else:
 690                    self._match(TokenType.ON)
 691                    durability = True
 692
 693                self._match_r_paren()
 694
 695            return self.expression(exp.Commit, this=this, durability=durability)
 696
 697        def _parse_transaction(self) -> exp.Transaction | exp.Command:
 698            """Applies to SQL Server and Azure SQL Database
 699            BEGIN { TRAN | TRANSACTION }
 700            [ { transaction_name | @tran_name_variable }
 701            [ WITH MARK [ 'description' ] ]
 702            ]
 703            """
 704            if self._match_texts(("TRAN", "TRANSACTION")):
 705                transaction = self.expression(exp.Transaction, this=self._parse_id_var())
 706                if self._match_text_seq("WITH", "MARK"):
 707                    transaction.set("mark", self._parse_string())
 708
 709                return transaction
 710
 711            return self._parse_as_command(self._prev)
 712
 713        def _parse_returns(self) -> exp.ReturnsProperty:
 714            table = self._parse_id_var(any_token=False, tokens=self.RETURNS_TABLE_TOKENS)
 715            returns = super()._parse_returns()
 716            returns.set("table", table)
 717            return returns
 718
 719        def _parse_convert(
 720            self, strict: bool, safe: t.Optional[bool] = None
 721        ) -> t.Optional[exp.Expression]:
 722            this = self._parse_types()
 723            self._match(TokenType.COMMA)
 724            args = [this, *self._parse_csv(self._parse_assignment)]
 725            convert = exp.Convert.from_arg_list(args)
 726            convert.set("safe", safe)
 727            convert.set("strict", strict)
 728            return convert
 729
 730        def _parse_user_defined_function(
 731            self, kind: t.Optional[TokenType] = None
 732        ) -> t.Optional[exp.Expression]:
 733            this = super()._parse_user_defined_function(kind=kind)
 734
 735            if (
 736                kind == TokenType.FUNCTION
 737                or isinstance(this, exp.UserDefinedFunction)
 738                or self._match(TokenType.ALIAS, advance=False)
 739            ):
 740                return this
 741
 742            if not self._match(TokenType.WITH, advance=False):
 743                expressions = self._parse_csv(self._parse_function_parameter)
 744            else:
 745                expressions = None
 746
 747            return self.expression(exp.UserDefinedFunction, this=this, expressions=expressions)
 748
 749        def _parse_id_var(
 750            self,
 751            any_token: bool = True,
 752            tokens: t.Optional[t.Collection[TokenType]] = None,
 753        ) -> t.Optional[exp.Expression]:
 754            is_temporary = self._match(TokenType.HASH)
 755            is_global = is_temporary and self._match(TokenType.HASH)
 756
 757            this = super()._parse_id_var(any_token=any_token, tokens=tokens)
 758            if this:
 759                if is_global:
 760                    this.set("global", True)
 761                elif is_temporary:
 762                    this.set("temporary", True)
 763
 764            return this
 765
 766        def _parse_create(self) -> exp.Create | exp.Command:
 767            create = super()._parse_create()
 768
 769            if isinstance(create, exp.Create):
 770                table = create.this.this if isinstance(create.this, exp.Schema) else create.this
 771                if isinstance(table, exp.Table) and table.this.args.get("temporary"):
 772                    if not create.args.get("properties"):
 773                        create.set("properties", exp.Properties(expressions=[]))
 774
 775                    create.args["properties"].append("expressions", exp.TemporaryProperty())
 776
 777            return create
 778
 779        def _parse_if(self) -> t.Optional[exp.Expression]:
 780            index = self._index
 781
 782            if self._match_text_seq("OBJECT_ID"):
 783                self._parse_wrapped_csv(self._parse_string)
 784                if self._match_text_seq("IS", "NOT", "NULL") and self._match(TokenType.DROP):
 785                    return self._parse_drop(exists=True)
 786                self._retreat(index)
 787
 788            return super()._parse_if()
 789
 790        def _parse_unique(self) -> exp.UniqueColumnConstraint:
 791            if self._match_texts(("CLUSTERED", "NONCLUSTERED")):
 792                this = self.CONSTRAINT_PARSERS[self._prev.text.upper()](self)
 793            else:
 794                this = self._parse_schema(self._parse_id_var(any_token=False))
 795
 796            return self.expression(exp.UniqueColumnConstraint, this=this)
 797
 798        def _parse_partition(self) -> t.Optional[exp.Partition]:
 799            if not self._match_text_seq("WITH", "(", "PARTITIONS"):
 800                return None
 801
 802            def parse_range():
 803                low = self._parse_bitwise()
 804                high = self._parse_bitwise() if self._match_text_seq("TO") else None
 805
 806                return (
 807                    self.expression(exp.PartitionRange, this=low, expression=high) if high else low
 808                )
 809
 810            partition = self.expression(
 811                exp.Partition, expressions=self._parse_wrapped_csv(parse_range)
 812            )
 813
 814            self._match_r_paren()
 815
 816            return partition
 817
 818        def _parse_declare(self) -> exp.Declare | exp.Command:
 819            index = self._index
 820            expressions = self._try_parse(partial(self._parse_csv, self._parse_declareitem))
 821
 822            if not expressions or self._curr:
 823                self._retreat(index)
 824                return self._parse_as_command(self._prev)
 825
 826            return self.expression(exp.Declare, expressions=expressions)
 827
 828        def _parse_declareitem(self) -> t.Optional[exp.DeclareItem]:
 829            var = self._parse_id_var()
 830            if not var:
 831                return None
 832
 833            value = None
 834            self._match(TokenType.ALIAS)
 835            if self._match(TokenType.TABLE):
 836                data_type = self._parse_schema()
 837            else:
 838                data_type = self._parse_types()
 839                if self._match(TokenType.EQ):
 840                    value = self._parse_bitwise()
 841
 842            return self.expression(exp.DeclareItem, this=var, kind=data_type, default=value)
 843
 844    class Generator(generator.Generator):
 845        LIMIT_IS_TOP = True
 846        QUERY_HINTS = False
 847        RETURNING_END = False
 848        NVL2_SUPPORTED = False
 849        ALTER_TABLE_INCLUDE_COLUMN_KEYWORD = False
 850        LIMIT_FETCH = "FETCH"
 851        COMPUTED_COLUMN_WITH_TYPE = False
 852        CTE_RECURSIVE_KEYWORD_REQUIRED = False
 853        ENSURE_BOOLS = True
 854        NULL_ORDERING_SUPPORTED = None
 855        SUPPORTS_SINGLE_ARG_CONCAT = False
 856        TABLESAMPLE_SEED_KEYWORD = "REPEATABLE"
 857        SUPPORTS_SELECT_INTO = True
 858        JSON_PATH_BRACKETED_KEY_SUPPORTED = False
 859        SUPPORTS_TO_NUMBER = False
 860        SET_OP_MODIFIERS = False
 861        COPY_PARAMS_EQ_REQUIRED = True
 862        PARSE_JSON_NAME = None
 863        EXCEPT_INTERSECT_SUPPORT_ALL_CLAUSE = False
 864
 865        EXPRESSIONS_WITHOUT_NESTED_CTES = {
 866            exp.Create,
 867            exp.Delete,
 868            exp.Insert,
 869            exp.Intersect,
 870            exp.Except,
 871            exp.Merge,
 872            exp.Select,
 873            exp.Subquery,
 874            exp.Union,
 875            exp.Update,
 876        }
 877
 878        SUPPORTED_JSON_PATH_PARTS = {
 879            exp.JSONPathKey,
 880            exp.JSONPathRoot,
 881            exp.JSONPathSubscript,
 882        }
 883
 884        TYPE_MAPPING = {
 885            **generator.Generator.TYPE_MAPPING,
 886            exp.DataType.Type.BOOLEAN: "BIT",
 887            exp.DataType.Type.DATETIME2: "DATETIME2",
 888            exp.DataType.Type.DECIMAL: "NUMERIC",
 889            exp.DataType.Type.DOUBLE: "FLOAT",
 890            exp.DataType.Type.INT: "INTEGER",
 891            exp.DataType.Type.ROWVERSION: "ROWVERSION",
 892            exp.DataType.Type.TEXT: "VARCHAR(MAX)",
 893            exp.DataType.Type.TIMESTAMP: "DATETIME2",
 894            exp.DataType.Type.TIMESTAMPNTZ: "DATETIME2",
 895            exp.DataType.Type.TIMESTAMPTZ: "DATETIMEOFFSET",
 896            exp.DataType.Type.SMALLDATETIME: "SMALLDATETIME",
 897            exp.DataType.Type.UTINYINT: "TINYINT",
 898            exp.DataType.Type.VARIANT: "SQL_VARIANT",
 899        }
 900
 901        TYPE_MAPPING.pop(exp.DataType.Type.NCHAR)
 902        TYPE_MAPPING.pop(exp.DataType.Type.NVARCHAR)
 903
 904        TRANSFORMS = {
 905            **generator.Generator.TRANSFORMS,
 906            exp.AnyValue: any_value_to_max_sql,
 907            exp.ArrayToString: rename_func("STRING_AGG"),
 908            exp.AutoIncrementColumnConstraint: lambda *_: "IDENTITY",
 909            exp.Chr: rename_func("CHAR"),
 910            exp.DateAdd: date_delta_sql("DATEADD"),
 911            exp.DateDiff: date_delta_sql("DATEDIFF"),
 912            exp.CTE: transforms.preprocess([qualify_derived_table_outputs]),
 913            exp.CurrentDate: rename_func("GETDATE"),
 914            exp.CurrentTimestamp: rename_func("GETDATE"),
 915            exp.DateStrToDate: datestrtodate_sql,
 916            exp.Extract: rename_func("DATEPART"),
 917            exp.GeneratedAsIdentityColumnConstraint: generatedasidentitycolumnconstraint_sql,
 918            exp.GroupConcat: _string_agg_sql,
 919            exp.If: rename_func("IIF"),
 920            exp.JSONExtract: _json_extract_sql,
 921            exp.JSONExtractScalar: _json_extract_sql,
 922            exp.LastDay: lambda self, e: self.func("EOMONTH", e.this),
 923            exp.Ln: rename_func("LOG"),
 924            exp.Max: max_or_greatest,
 925            exp.MD5: lambda self, e: self.func("HASHBYTES", exp.Literal.string("MD5"), e.this),
 926            exp.Min: min_or_least,
 927            exp.NumberToStr: _format_sql,
 928            exp.Repeat: rename_func("REPLICATE"),
 929            exp.Select: transforms.preprocess(
 930                [
 931                    transforms.eliminate_distinct_on,
 932                    transforms.eliminate_semi_and_anti_joins,
 933                    transforms.eliminate_qualify,
 934                    transforms.unnest_generate_date_array_using_recursive_cte,
 935                ]
 936            ),
 937            exp.Stddev: rename_func("STDEV"),
 938            exp.StrPosition: lambda self, e: self.func(
 939                "CHARINDEX", e.args.get("substr"), e.this, e.args.get("position")
 940            ),
 941            exp.Subquery: transforms.preprocess([qualify_derived_table_outputs]),
 942            exp.SHA: lambda self, e: self.func("HASHBYTES", exp.Literal.string("SHA1"), e.this),
 943            exp.SHA2: lambda self, e: self.func(
 944                "HASHBYTES", exp.Literal.string(f"SHA2_{e.args.get('length', 256)}"), e.this
 945            ),
 946            exp.TemporaryProperty: lambda self, e: "",
 947            exp.TimeStrToTime: _timestrtotime_sql,
 948            exp.TimeToStr: _format_sql,
 949            exp.Trim: trim_sql,
 950            exp.TsOrDsAdd: date_delta_sql("DATEADD", cast=True),
 951            exp.TsOrDsDiff: date_delta_sql("DATEDIFF"),
 952            exp.TimestampTrunc: lambda self, e: self.func("DATETRUNC", e.unit, e.this),
 953            exp.DateFromParts: rename_func("DATEFROMPARTS"),
 954        }
 955
 956        TRANSFORMS.pop(exp.ReturnsProperty)
 957
 958        PROPERTIES_LOCATION = {
 959            **generator.Generator.PROPERTIES_LOCATION,
 960            exp.VolatileProperty: exp.Properties.Location.UNSUPPORTED,
 961        }
 962
 963        def scope_resolution(self, rhs: str, scope_name: str) -> str:
 964            return f"{scope_name}::{rhs}"
 965
 966        def select_sql(self, expression: exp.Select) -> str:
 967            if expression.args.get("offset"):
 968                if not expression.args.get("order"):
 969                    # ORDER BY is required in order to use OFFSET in a query, so we use
 970                    # a noop order by, since we don't really care about the order.
 971                    # See: https://www.microsoftpressstore.com/articles/article.aspx?p=2314819
 972                    expression.order_by(exp.select(exp.null()).subquery(), copy=False)
 973
 974                limit = expression.args.get("limit")
 975                if isinstance(limit, exp.Limit):
 976                    # TOP and OFFSET can't be combined, we need use FETCH instead of TOP
 977                    # we replace here because otherwise TOP would be generated in select_sql
 978                    limit.replace(exp.Fetch(direction="FIRST", count=limit.expression))
 979
 980            return super().select_sql(expression)
 981
 982        def convert_sql(self, expression: exp.Convert) -> str:
 983            name = "TRY_CONVERT" if expression.args.get("safe") else "CONVERT"
 984            return self.func(
 985                name, expression.this, expression.expression, expression.args.get("style")
 986            )
 987
 988        def queryoption_sql(self, expression: exp.QueryOption) -> str:
 989            option = self.sql(expression, "this")
 990            value = self.sql(expression, "expression")
 991            if value:
 992                optional_equal_sign = "= " if option in OPTIONS_THAT_REQUIRE_EQUAL else ""
 993                return f"{option} {optional_equal_sign}{value}"
 994            return option
 995
 996        def lateral_op(self, expression: exp.Lateral) -> str:
 997            cross_apply = expression.args.get("cross_apply")
 998            if cross_apply is True:
 999                return "CROSS APPLY"
1000            if cross_apply is False:
1001                return "OUTER APPLY"
1002
1003            # TODO: perhaps we can check if the parent is a Join and transpile it appropriately
1004            self.unsupported("LATERAL clause is not supported.")
1005            return "LATERAL"
1006
1007        def splitpart_sql(self: TSQL.Generator, expression: exp.SplitPart) -> str:
1008            this = expression.this
1009            split_count = len(this.name.split("."))
1010            delimiter = expression.args.get("delimiter")
1011            part_index = expression.args.get("part_index")
1012
1013            if (
1014                not all(isinstance(arg, exp.Literal) for arg in (this, delimiter, part_index))
1015                or (delimiter and delimiter.name != ".")
1016                or not part_index
1017                or split_count > 4
1018            ):
1019                self.unsupported(
1020                    "SPLIT_PART can be transpiled to PARSENAME only for '.' delimiter and literal values"
1021                )
1022                return ""
1023
1024            return self.func(
1025                "PARSENAME", this, exp.Literal.number(split_count + 1 - part_index.to_py())
1026            )
1027
1028        def timefromparts_sql(self, expression: exp.TimeFromParts) -> str:
1029            nano = expression.args.get("nano")
1030            if nano is not None:
1031                nano.pop()
1032                self.unsupported("Specifying nanoseconds is not supported in TIMEFROMPARTS.")
1033
1034            if expression.args.get("fractions") is None:
1035                expression.set("fractions", exp.Literal.number(0))
1036            if expression.args.get("precision") is None:
1037                expression.set("precision", exp.Literal.number(0))
1038
1039            return rename_func("TIMEFROMPARTS")(self, expression)
1040
1041        def timestampfromparts_sql(self, expression: exp.TimestampFromParts) -> str:
1042            zone = expression.args.get("zone")
1043            if zone is not None:
1044                zone.pop()
1045                self.unsupported("Time zone is not supported in DATETIMEFROMPARTS.")
1046
1047            nano = expression.args.get("nano")
1048            if nano is not None:
1049                nano.pop()
1050                self.unsupported("Specifying nanoseconds is not supported in DATETIMEFROMPARTS.")
1051
1052            if expression.args.get("milli") is None:
1053                expression.set("milli", exp.Literal.number(0))
1054
1055            return rename_func("DATETIMEFROMPARTS")(self, expression)
1056
1057        def setitem_sql(self, expression: exp.SetItem) -> str:
1058            this = expression.this
1059            if isinstance(this, exp.EQ) and not isinstance(this.left, exp.Parameter):
1060                # T-SQL does not use '=' in SET command, except when the LHS is a variable.
1061                return f"{self.sql(this.left)} {self.sql(this.right)}"
1062
1063            return super().setitem_sql(expression)
1064
1065        def boolean_sql(self, expression: exp.Boolean) -> str:
1066            if type(expression.parent) in BIT_TYPES or isinstance(
1067                expression.find_ancestor(exp.Values, exp.Select), exp.Values
1068            ):
1069                return "1" if expression.this else "0"
1070
1071            return "(1 = 1)" if expression.this else "(1 = 0)"
1072
1073        def is_sql(self, expression: exp.Is) -> str:
1074            if isinstance(expression.expression, exp.Boolean):
1075                return self.binary(expression, "=")
1076            return self.binary(expression, "IS")
1077
1078        def createable_sql(self, expression: exp.Create, locations: t.DefaultDict) -> str:
1079            sql = self.sql(expression, "this")
1080            properties = expression.args.get("properties")
1081
1082            if sql[:1] != "#" and any(
1083                isinstance(prop, exp.TemporaryProperty)
1084                for prop in (properties.expressions if properties else [])
1085            ):
1086                sql = f"[#{sql[1:]}" if sql.startswith("[") else f"#{sql}"
1087
1088            return sql
1089
1090        def create_sql(self, expression: exp.Create) -> str:
1091            kind = expression.kind
1092            exists = expression.args.pop("exists", None)
1093
1094            like_property = expression.find(exp.LikeProperty)
1095            if like_property:
1096                ctas_expression = like_property.this
1097            else:
1098                ctas_expression = expression.expression
1099
1100            if kind == "VIEW":
1101                expression.this.set("catalog", None)
1102                with_ = expression.args.get("with")
1103                if ctas_expression and with_:
1104                    # We've already preprocessed the Create expression to bubble up any nested CTEs,
1105                    # but CREATE VIEW actually requires the WITH clause to come after it so we need
1106                    # to amend the AST by moving the CTEs to the CREATE VIEW statement's query.
1107                    ctas_expression.set("with", with_.pop())
1108
1109            sql = super().create_sql(expression)
1110
1111            table = expression.find(exp.Table)
1112
1113            # Convert CTAS statement to SELECT .. INTO ..
1114            if kind == "TABLE" and ctas_expression:
1115                if isinstance(ctas_expression, exp.UNWRAPPED_QUERIES):
1116                    ctas_expression = ctas_expression.subquery()
1117
1118                select_into = exp.select("*").from_(exp.alias_(ctas_expression, "temp", table=True))
1119                select_into.set("into", exp.Into(this=table))
1120
1121                if like_property:
1122                    select_into.limit(0, copy=False)
1123
1124                sql = self.sql(select_into)
1125
1126            if exists:
1127                identifier = self.sql(exp.Literal.string(exp.table_name(table) if table else ""))
1128                sql_with_ctes = self.prepend_ctes(expression, sql)
1129                sql_literal = self.sql(exp.Literal.string(sql_with_ctes))
1130                if kind == "SCHEMA":
1131                    return f"""IF NOT EXISTS (SELECT * FROM information_schema.schemata WHERE schema_name = {identifier}) EXEC({sql_literal})"""
1132                elif kind == "TABLE":
1133                    assert table
1134                    where = exp.and_(
1135                        exp.column("table_name").eq(table.name),
1136                        exp.column("table_schema").eq(table.db) if table.db else None,
1137                        exp.column("table_catalog").eq(table.catalog) if table.catalog else None,
1138                    )
1139                    return f"""IF NOT EXISTS (SELECT * FROM information_schema.tables WHERE {where}) EXEC({sql_literal})"""
1140                elif kind == "INDEX":
1141                    index = self.sql(exp.Literal.string(expression.this.text("this")))
1142                    return f"""IF NOT EXISTS (SELECT * FROM sys.indexes WHERE object_id = object_id({identifier}) AND name = {index}) EXEC({sql_literal})"""
1143            elif expression.args.get("replace"):
1144                sql = sql.replace("CREATE OR REPLACE ", "CREATE OR ALTER ", 1)
1145
1146            return self.prepend_ctes(expression, sql)
1147
1148        def count_sql(self, expression: exp.Count) -> str:
1149            func_name = "COUNT_BIG" if expression.args.get("big_int") else "COUNT"
1150            return rename_func(func_name)(self, expression)
1151
1152        def offset_sql(self, expression: exp.Offset) -> str:
1153            return f"{super().offset_sql(expression)} ROWS"
1154
1155        def version_sql(self, expression: exp.Version) -> str:
1156            name = "SYSTEM_TIME" if expression.name == "TIMESTAMP" else expression.name
1157            this = f"FOR {name}"
1158            expr = expression.expression
1159            kind = expression.text("kind")
1160            if kind in ("FROM", "BETWEEN"):
1161                args = expr.expressions
1162                sep = "TO" if kind == "FROM" else "AND"
1163                expr_sql = f"{self.sql(seq_get(args, 0))} {sep} {self.sql(seq_get(args, 1))}"
1164            else:
1165                expr_sql = self.sql(expr)
1166
1167            expr_sql = f" {expr_sql}" if expr_sql else ""
1168            return f"{this} {kind}{expr_sql}"
1169
1170        def returnsproperty_sql(self, expression: exp.ReturnsProperty) -> str:
1171            table = expression.args.get("table")
1172            table = f"{table} " if table else ""
1173            return f"RETURNS {table}{self.sql(expression, 'this')}"
1174
1175        def returning_sql(self, expression: exp.Returning) -> str:
1176            into = self.sql(expression, "into")
1177            into = self.seg(f"INTO {into}") if into else ""
1178            return f"{self.seg('OUTPUT')} {self.expressions(expression, flat=True)}{into}"
1179
1180        def transaction_sql(self, expression: exp.Transaction) -> str:
1181            this = self.sql(expression, "this")
1182            this = f" {this}" if this else ""
1183            mark = self.sql(expression, "mark")
1184            mark = f" WITH MARK {mark}" if mark else ""
1185            return f"BEGIN TRANSACTION{this}{mark}"
1186
1187        def commit_sql(self, expression: exp.Commit) -> str:
1188            this = self.sql(expression, "this")
1189            this = f" {this}" if this else ""
1190            durability = expression.args.get("durability")
1191            durability = (
1192                f" WITH (DELAYED_DURABILITY = {'ON' if durability else 'OFF'})"
1193                if durability is not None
1194                else ""
1195            )
1196            return f"COMMIT TRANSACTION{this}{durability}"
1197
1198        def rollback_sql(self, expression: exp.Rollback) -> str:
1199            this = self.sql(expression, "this")
1200            this = f" {this}" if this else ""
1201            return f"ROLLBACK TRANSACTION{this}"
1202
1203        def identifier_sql(self, expression: exp.Identifier) -> str:
1204            identifier = super().identifier_sql(expression)
1205
1206            if expression.args.get("global"):
1207                identifier = f"##{identifier}"
1208            elif expression.args.get("temporary"):
1209                identifier = f"#{identifier}"
1210
1211            return identifier
1212
1213        def constraint_sql(self, expression: exp.Constraint) -> str:
1214            this = self.sql(expression, "this")
1215            expressions = self.expressions(expression, flat=True, sep=" ")
1216            return f"CONSTRAINT {this} {expressions}"
1217
1218        def length_sql(self, expression: exp.Length) -> str:
1219            return self._uncast_text(expression, "LEN")
1220
1221        def right_sql(self, expression: exp.Right) -> str:
1222            return self._uncast_text(expression, "RIGHT")
1223
1224        def left_sql(self, expression: exp.Left) -> str:
1225            return self._uncast_text(expression, "LEFT")
1226
1227        def _uncast_text(self, expression: exp.Expression, name: str) -> str:
1228            this = expression.this
1229            if isinstance(this, exp.Cast) and this.is_type(exp.DataType.Type.TEXT):
1230                this_sql = self.sql(this, "this")
1231            else:
1232                this_sql = self.sql(this)
1233            expression_sql = self.sql(expression, "expression")
1234            return self.func(name, this_sql, expression_sql if expression_sql else None)
1235
1236        def partition_sql(self, expression: exp.Partition) -> str:
1237            return f"WITH (PARTITIONS({self.expressions(expression, flat=True)}))"
1238
1239        def alter_sql(self, expression: exp.Alter) -> str:
1240            action = seq_get(expression.args.get("actions") or [], 0)
1241            if isinstance(action, exp.AlterRename):
1242                return f"EXEC sp_rename '{self.sql(expression.this)}', '{action.this.name}'"
1243            return super().alter_sql(expression)
1244
1245        def drop_sql(self, expression: exp.Drop) -> str:
1246            if expression.args["kind"] == "VIEW":
1247                expression.this.set("catalog", None)
1248            return super().drop_sql(expression)
1249
1250        def declare_sql(self, expression: exp.Declare) -> str:
1251            return f"DECLARE {self.expressions(expression, flat=True)}"
1252
1253        def declareitem_sql(self, expression: exp.DeclareItem) -> str:
1254            variable = self.sql(expression, "this")
1255            default = self.sql(expression, "default")
1256            default = f" = {default}" if default else ""
1257
1258            kind = self.sql(expression, "kind")
1259            if isinstance(expression.args.get("kind"), exp.Schema):
1260                kind = f"TABLE {kind}"
1261
1262            return f"{variable} AS {kind}{default}"
1263
1264        def options_modifier(self, expression: exp.Expression) -> str:
1265            options = self.expressions(expression, key="options")
1266            return f" OPTION{self.wrap(options)}" if options else ""
1267
1268        def dpipe_sql(self, expression: exp.DPipe) -> str:
1269            return self.sql(
1270                reduce(lambda x, y: exp.Add(this=x, expression=y), expression.flatten())
1271            )
1272
1273        def isascii_sql(self, expression: exp.IsAscii) -> str:
1274            return f"(PATINDEX(CONVERT(VARCHAR(MAX), 0x255b5e002d7f5d25) COLLATE Latin1_General_BIN, {self.sql(expression.this)}) = 0)"