Edit on GitHub

# sqlglot.dialects.clickhouse

View Source

      1from __future__ import annotations
      2
      3import typing as t
      4
      5from sqlglot import exp, generator, parser, tokens
      6from sqlglot.dialects.dialect import Dialect, inline_array_sql, var_map_sql
      7from sqlglot.errors import ParseError
      8from sqlglot.helper import ensure_list, seq_get
      9from sqlglot.parser import parse_var_map
     10from sqlglot.tokens import TokenType
     11
     12
     13def _lower_func(sql: str) -> str:
     14    index = sql.index("(")
     15    return sql[:index].lower() + sql[index:]
     16
     17
     18class ClickHouse(Dialect):
     19    normalize_functions = None
     20    null_ordering = "nulls_are_last"
     21
     22    class Tokenizer(tokens.Tokenizer):
     23        COMMENTS = ["--", "#", "#!", ("/*", "*/")]
     24        IDENTIFIERS = ['"', "`"]
     25
     26        KEYWORDS = {
     27            **tokens.Tokenizer.KEYWORDS,
     28            "ASOF": TokenType.ASOF,
     29            "GLOBAL": TokenType.GLOBAL,
     30            "DATETIME64": TokenType.DATETIME,
     31            "FINAL": TokenType.FINAL,
     32            "FLOAT32": TokenType.FLOAT,
     33            "FLOAT64": TokenType.DOUBLE,
     34            "INT16": TokenType.SMALLINT,
     35            "INT32": TokenType.INT,
     36            "INT64": TokenType.BIGINT,
     37            "INT8": TokenType.TINYINT,
     38            "TUPLE": TokenType.STRUCT,
     39        }
     40
     41    class Parser(parser.Parser):
     42        FUNCTIONS = {
     43            **parser.Parser.FUNCTIONS,  # type: ignore
     44            "EXPONENTIALTIMEDECAYEDAVG": lambda params, args: exp.ExponentialTimeDecayedAvg(
     45                this=seq_get(args, 0),
     46                time=seq_get(args, 1),
     47                decay=seq_get(params, 0),
     48            ),
     49            "GROUPUNIQARRAY": lambda params, args: exp.GroupUniqArray(
     50                this=seq_get(args, 0), size=seq_get(params, 0)
     51            ),
     52            "HISTOGRAM": lambda params, args: exp.Histogram(
     53                this=seq_get(args, 0), bins=seq_get(params, 0)
     54            ),
     55            "MAP": parse_var_map,
     56            "MATCH": exp.RegexpLike.from_arg_list,
     57            "QUANTILE": lambda params, args: exp.Quantile(this=args, quantile=params),
     58            "QUANTILES": lambda params, args: exp.Quantiles(parameters=params, expressions=args),
     59            "QUANTILEIF": lambda params, args: exp.QuantileIf(parameters=params, expressions=args),
     60        }
     61
     62        FUNCTION_PARSERS = parser.Parser.FUNCTION_PARSERS.copy()
     63        FUNCTION_PARSERS.pop("MATCH")
     64
     65        RANGE_PARSERS = {
     66            **parser.Parser.RANGE_PARSERS,
     67            TokenType.GLOBAL: lambda self, this: self._match(TokenType.IN)
     68            and self._parse_in(this, is_global=True),
     69        }
     70
     71        JOIN_KINDS = {*parser.Parser.JOIN_KINDS, TokenType.ANY, TokenType.ASOF}  # type: ignore
     72
     73        TABLE_ALIAS_TOKENS = {*parser.Parser.TABLE_ALIAS_TOKENS} - {TokenType.ANY}  # type: ignore
     74
     75        LOG_DEFAULTS_TO_LN = True
     76
     77        def _parse_in(
     78            self, this: t.Optional[exp.Expression], is_global: bool = False
     79        ) -> exp.Expression:
     80            this = super()._parse_in(this)
     81            this.set("is_global", is_global)
     82            return this
     83
     84        def _parse_table(
     85            self, schema: bool = False, alias_tokens: t.Optional[t.Collection[TokenType]] = None
     86        ) -> t.Optional[exp.Expression]:
     87            this = super()._parse_table(schema=schema, alias_tokens=alias_tokens)
     88
     89            if self._match(TokenType.FINAL):
     90                this = self.expression(exp.Final, this=this)
     91
     92            return this
     93
     94        def _parse_position(self, haystack_first: bool = False) -> exp.Expression:
     95            return super()._parse_position(haystack_first=True)
     96
     97        # https://clickhouse.com/docs/en/sql-reference/statements/select/with/
     98        def _parse_cte(self) -> exp.Expression:
     99            index = self._index
    100            try:
    101                # WITH <identifier> AS <subquery expression>
    102                return super()._parse_cte()
    103            except ParseError:
    104                # WITH <expression> AS <identifier>
    105                self._retreat(index)
    106                statement = self._parse_statement()
    107
    108                if statement and isinstance(statement.this, exp.Alias):
    109                    self.raise_error("Expected CTE to have alias")
    110
    111                return self.expression(exp.CTE, this=statement, alias=statement and statement.this)
    112
    113    class Generator(generator.Generator):
    114        STRUCT_DELIMITER = ("(", ")")
    115
    116        TYPE_MAPPING = {
    117            **generator.Generator.TYPE_MAPPING,  # type: ignore
    118            exp.DataType.Type.NULLABLE: "Nullable",
    119            exp.DataType.Type.DATETIME: "DateTime64",
    120            exp.DataType.Type.MAP: "Map",
    121            exp.DataType.Type.ARRAY: "Array",
    122            exp.DataType.Type.STRUCT: "Tuple",
    123            exp.DataType.Type.TINYINT: "Int8",
    124            exp.DataType.Type.SMALLINT: "Int16",
    125            exp.DataType.Type.INT: "Int32",
    126            exp.DataType.Type.BIGINT: "Int64",
    127            exp.DataType.Type.FLOAT: "Float32",
    128            exp.DataType.Type.DOUBLE: "Float64",
    129        }
    130
    131        TRANSFORMS = {
    132            **generator.Generator.TRANSFORMS,  # type: ignore
    133            exp.Array: inline_array_sql,
    134            exp.ExponentialTimeDecayedAvg: lambda self, e: f"exponentialTimeDecayedAvg{self._param_args_sql(e, 'decay', ['this', 'time'])}",
    135            exp.Final: lambda self, e: f"{self.sql(e, 'this')} FINAL",
    136            exp.GroupUniqArray: lambda self, e: f"groupUniqArray{self._param_args_sql(e, 'size', 'this')}",
    137            exp.Histogram: lambda self, e: f"histogram{self._param_args_sql(e, 'bins', 'this')}",
    138            exp.Map: lambda self, e: _lower_func(var_map_sql(self, e)),
    139            exp.Quantile: lambda self, e: f"quantile{self._param_args_sql(e, 'quantile', 'this')}",
    140            exp.Quantiles: lambda self, e: f"quantiles{self._param_args_sql(e, 'parameters', 'expressions')}",
    141            exp.QuantileIf: lambda self, e: f"quantileIf{self._param_args_sql(e, 'parameters', 'expressions')}",
    142            exp.RegexpLike: lambda self, e: f"match({self.format_args(e.this, e.expression)})",
    143            exp.StrPosition: lambda self, e: f"position({self.format_args(e.this, e.args.get('substr'), e.args.get('position'))})",
    144            exp.VarMap: lambda self, e: _lower_func(var_map_sql(self, e)),
    145        }
    146
    147        PROPERTIES_LOCATION = {
    148            **generator.Generator.PROPERTIES_LOCATION,  # type: ignore
    149            exp.VolatileProperty: exp.Properties.Location.UNSUPPORTED,
    150        }
    151
    152        JOIN_HINTS = False
    153        TABLE_HINTS = False
    154        EXPLICIT_UNION = True
    155
    156        def _param_args_sql(
    157            self,
    158            expression: exp.Expression,
    159            param_names: str | t.List[str],
    160            arg_names: str | t.List[str],
    161        ) -> str:
    162            params = self.format_args(
    163                *(
    164                    arg
    165                    for name in ensure_list(param_names)
    166                    for arg in ensure_list(expression.args.get(name))
    167                )
    168            )
    169            args = self.format_args(
    170                *(
    171                    arg
    172                    for name in ensure_list(arg_names)
    173                    for arg in ensure_list(expression.args.get(name))
    174                )
    175            )
    176            return f"({params})({args})"
    177
    178        def cte_sql(self, expression: exp.CTE) -> str:
    179            if isinstance(expression.this, exp.Alias):
    180                return self.sql(expression, "this")
    181
    182            return super().cte_sql(expression)

class ClickHouse(sqlglot.dialects.dialect.Dialect): View Source

     19class ClickHouse(Dialect):
     20    normalize_functions = None
     21    null_ordering = "nulls_are_last"
     22
     23    class Tokenizer(tokens.Tokenizer):
     24        COMMENTS = ["--", "#", "#!", ("/*", "*/")]
     25        IDENTIFIERS = ['"', "`"]
     26
     27        KEYWORDS = {
     28            **tokens.Tokenizer.KEYWORDS,
     29            "ASOF": TokenType.ASOF,
     30            "GLOBAL": TokenType.GLOBAL,
     31            "DATETIME64": TokenType.DATETIME,
     32            "FINAL": TokenType.FINAL,
     33            "FLOAT32": TokenType.FLOAT,
     34            "FLOAT64": TokenType.DOUBLE,
     35            "INT16": TokenType.SMALLINT,
     36            "INT32": TokenType.INT,
     37            "INT64": TokenType.BIGINT,
     38            "INT8": TokenType.TINYINT,
     39            "TUPLE": TokenType.STRUCT,
     40        }
     41
     42    class Parser(parser.Parser):
     43        FUNCTIONS = {
     44            **parser.Parser.FUNCTIONS,  # type: ignore
     45            "EXPONENTIALTIMEDECAYEDAVG": lambda params, args: exp.ExponentialTimeDecayedAvg(
     46                this=seq_get(args, 0),
     47                time=seq_get(args, 1),
     48                decay=seq_get(params, 0),
     49            ),
     50            "GROUPUNIQARRAY": lambda params, args: exp.GroupUniqArray(
     51                this=seq_get(args, 0), size=seq_get(params, 0)
     52            ),
     53            "HISTOGRAM": lambda params, args: exp.Histogram(
     54                this=seq_get(args, 0), bins=seq_get(params, 0)
     55            ),
     56            "MAP": parse_var_map,
     57            "MATCH": exp.RegexpLike.from_arg_list,
     58            "QUANTILE": lambda params, args: exp.Quantile(this=args, quantile=params),
     59            "QUANTILES": lambda params, args: exp.Quantiles(parameters=params, expressions=args),
     60            "QUANTILEIF": lambda params, args: exp.QuantileIf(parameters=params, expressions=args),
     61        }
     62
     63        FUNCTION_PARSERS = parser.Parser.FUNCTION_PARSERS.copy()
     64        FUNCTION_PARSERS.pop("MATCH")
     65
     66        RANGE_PARSERS = {
     67            **parser.Parser.RANGE_PARSERS,
     68            TokenType.GLOBAL: lambda self, this: self._match(TokenType.IN)
     69            and self._parse_in(this, is_global=True),
     70        }
     71
     72        JOIN_KINDS = {*parser.Parser.JOIN_KINDS, TokenType.ANY, TokenType.ASOF}  # type: ignore
     73
     74        TABLE_ALIAS_TOKENS = {*parser.Parser.TABLE_ALIAS_TOKENS} - {TokenType.ANY}  # type: ignore
     75
     76        LOG_DEFAULTS_TO_LN = True
     77
     78        def _parse_in(
     79            self, this: t.Optional[exp.Expression], is_global: bool = False
     80        ) -> exp.Expression:
     81            this = super()._parse_in(this)
     82            this.set("is_global", is_global)
     83            return this
     84
     85        def _parse_table(
     86            self, schema: bool = False, alias_tokens: t.Optional[t.Collection[TokenType]] = None
     87        ) -> t.Optional[exp.Expression]:
     88            this = super()._parse_table(schema=schema, alias_tokens=alias_tokens)
     89
     90            if self._match(TokenType.FINAL):
     91                this = self.expression(exp.Final, this=this)
     92
     93            return this
     94
     95        def _parse_position(self, haystack_first: bool = False) -> exp.Expression:
     96            return super()._parse_position(haystack_first=True)
     97
     98        # https://clickhouse.com/docs/en/sql-reference/statements/select/with/
     99        def _parse_cte(self) -> exp.Expression:
    100            index = self._index
    101            try:
    102                # WITH <identifier> AS <subquery expression>
    103                return super()._parse_cte()
    104            except ParseError:
    105                # WITH <expression> AS <identifier>
    106                self._retreat(index)
    107                statement = self._parse_statement()
    108
    109                if statement and isinstance(statement.this, exp.Alias):
    110                    self.raise_error("Expected CTE to have alias")
    111
    112                return self.expression(exp.CTE, this=statement, alias=statement and statement.this)
    113
    114    class Generator(generator.Generator):
    115        STRUCT_DELIMITER = ("(", ")")
    116
    117        TYPE_MAPPING = {
    118            **generator.Generator.TYPE_MAPPING,  # type: ignore
    119            exp.DataType.Type.NULLABLE: "Nullable",
    120            exp.DataType.Type.DATETIME: "DateTime64",
    121            exp.DataType.Type.MAP: "Map",
    122            exp.DataType.Type.ARRAY: "Array",
    123            exp.DataType.Type.STRUCT: "Tuple",
    124            exp.DataType.Type.TINYINT: "Int8",
    125            exp.DataType.Type.SMALLINT: "Int16",
    126            exp.DataType.Type.INT: "Int32",
    127            exp.DataType.Type.BIGINT: "Int64",
    128            exp.DataType.Type.FLOAT: "Float32",
    129            exp.DataType.Type.DOUBLE: "Float64",
    130        }
    131
    132        TRANSFORMS = {
    133            **generator.Generator.TRANSFORMS,  # type: ignore
    134            exp.Array: inline_array_sql,
    135            exp.ExponentialTimeDecayedAvg: lambda self, e: f"exponentialTimeDecayedAvg{self._param_args_sql(e, 'decay', ['this', 'time'])}",
    136            exp.Final: lambda self, e: f"{self.sql(e, 'this')} FINAL",
    137            exp.GroupUniqArray: lambda self, e: f"groupUniqArray{self._param_args_sql(e, 'size', 'this')}",
    138            exp.Histogram: lambda self, e: f"histogram{self._param_args_sql(e, 'bins', 'this')}",
    139            exp.Map: lambda self, e: _lower_func(var_map_sql(self, e)),
    140            exp.Quantile: lambda self, e: f"quantile{self._param_args_sql(e, 'quantile', 'this')}",
    141            exp.Quantiles: lambda self, e: f"quantiles{self._param_args_sql(e, 'parameters', 'expressions')}",
    142            exp.QuantileIf: lambda self, e: f"quantileIf{self._param_args_sql(e, 'parameters', 'expressions')}",
    143            exp.RegexpLike: lambda self, e: f"match({self.format_args(e.this, e.expression)})",
    144            exp.StrPosition: lambda self, e: f"position({self.format_args(e.this, e.args.get('substr'), e.args.get('position'))})",
    145            exp.VarMap: lambda self, e: _lower_func(var_map_sql(self, e)),
    146        }
    147
    148        PROPERTIES_LOCATION = {
    149            **generator.Generator.PROPERTIES_LOCATION,  # type: ignore
    150            exp.VolatileProperty: exp.Properties.Location.UNSUPPORTED,
    151        }
    152
    153        JOIN_HINTS = False
    154        TABLE_HINTS = False
    155        EXPLICIT_UNION = True
    156
    157        def _param_args_sql(
    158            self,
    159            expression: exp.Expression,
    160            param_names: str | t.List[str],
    161            arg_names: str | t.List[str],
    162        ) -> str:
    163            params = self.format_args(
    164                *(
    165                    arg
    166                    for name in ensure_list(param_names)
    167                    for arg in ensure_list(expression.args.get(name))
    168                )
    169            )
    170            args = self.format_args(
    171                *(
    172                    arg
    173                    for name in ensure_list(arg_names)
    174                    for arg in ensure_list(expression.args.get(name))
    175                )
    176            )
    177            return f"({params})({args})"
    178
    179        def cte_sql(self, expression: exp.CTE) -> str:
    180            if isinstance(expression.this, exp.Alias):
    181                return self.sql(expression, "this")
    182
    183            return super().cte_sql(expression)

##### Inherited Members

sqlglot.dialects.dialect.Dialect
  get_or_raise
  format_time
  parse
  parse_into
  generate
  transpile
  tokenize
  parser
  generator

class ClickHouse.Tokenizer(sqlglot.tokens.Tokenizer): View Source

    23    class Tokenizer(tokens.Tokenizer):
    24        COMMENTS = ["--", "#", "#!", ("/*", "*/")]
    25        IDENTIFIERS = ['"', "`"]
    26
    27        KEYWORDS = {
    28            **tokens.Tokenizer.KEYWORDS,
    29            "ASOF": TokenType.ASOF,
    30            "GLOBAL": TokenType.GLOBAL,
    31            "DATETIME64": TokenType.DATETIME,
    32            "FINAL": TokenType.FINAL,
    33            "FLOAT32": TokenType.FLOAT,
    34            "FLOAT64": TokenType.DOUBLE,
    35            "INT16": TokenType.SMALLINT,
    36            "INT32": TokenType.INT,
    37            "INT64": TokenType.BIGINT,
    38            "INT8": TokenType.TINYINT,
    39            "TUPLE": TokenType.STRUCT,
    40        }

##### Inherited Members

sqlglot.tokens.Tokenizer
  reset
  tokenize

class ClickHouse.Parser(sqlglot.parser.Parser): View Source

     42    class Parser(parser.Parser):
     43        FUNCTIONS = {
     44            **parser.Parser.FUNCTIONS,  # type: ignore
     45            "EXPONENTIALTIMEDECAYEDAVG": lambda params, args: exp.ExponentialTimeDecayedAvg(
     46                this=seq_get(args, 0),
     47                time=seq_get(args, 1),
     48                decay=seq_get(params, 0),
     49            ),
     50            "GROUPUNIQARRAY": lambda params, args: exp.GroupUniqArray(
     51                this=seq_get(args, 0), size=seq_get(params, 0)
     52            ),
     53            "HISTOGRAM": lambda params, args: exp.Histogram(
     54                this=seq_get(args, 0), bins=seq_get(params, 0)
     55            ),
     56            "MAP": parse_var_map,
     57            "MATCH": exp.RegexpLike.from_arg_list,
     58            "QUANTILE": lambda params, args: exp.Quantile(this=args, quantile=params),
     59            "QUANTILES": lambda params, args: exp.Quantiles(parameters=params, expressions=args),
     60            "QUANTILEIF": lambda params, args: exp.QuantileIf(parameters=params, expressions=args),
     61        }
     62
     63        FUNCTION_PARSERS = parser.Parser.FUNCTION_PARSERS.copy()
     64        FUNCTION_PARSERS.pop("MATCH")
     65
     66        RANGE_PARSERS = {
     67            **parser.Parser.RANGE_PARSERS,
     68            TokenType.GLOBAL: lambda self, this: self._match(TokenType.IN)
     69            and self._parse_in(this, is_global=True),
     70        }
     71
     72        JOIN_KINDS = {*parser.Parser.JOIN_KINDS, TokenType.ANY, TokenType.ASOF}  # type: ignore
     73
     74        TABLE_ALIAS_TOKENS = {*parser.Parser.TABLE_ALIAS_TOKENS} - {TokenType.ANY}  # type: ignore
     75
     76        LOG_DEFAULTS_TO_LN = True
     77
     78        def _parse_in(
     79            self, this: t.Optional[exp.Expression], is_global: bool = False
     80        ) -> exp.Expression:
     81            this = super()._parse_in(this)
     82            this.set("is_global", is_global)
     83            return this
     84
     85        def _parse_table(
     86            self, schema: bool = False, alias_tokens: t.Optional[t.Collection[TokenType]] = None
     87        ) -> t.Optional[exp.Expression]:
     88            this = super()._parse_table(schema=schema, alias_tokens=alias_tokens)
     89
     90            if self._match(TokenType.FINAL):
     91                this = self.expression(exp.Final, this=this)
     92
     93            return this
     94
     95        def _parse_position(self, haystack_first: bool = False) -> exp.Expression:
     96            return super()._parse_position(haystack_first=True)
     97
     98        # https://clickhouse.com/docs/en/sql-reference/statements/select/with/
     99        def _parse_cte(self) -> exp.Expression:
    100            index = self._index
    101            try:
    102                # WITH <identifier> AS <subquery expression>
    103                return super()._parse_cte()
    104            except ParseError:
    105                # WITH <expression> AS <identifier>
    106                self._retreat(index)
    107                statement = self._parse_statement()
    108
    109                if statement and isinstance(statement.this, exp.Alias):
    110                    self.raise_error("Expected CTE to have alias")
    111
    112                return self.expression(exp.CTE, this=statement, alias=statement and statement.this)

Parser consumes a list of tokens produced by the `sqlglot.tokens.Tokenizer` and produces a parsed syntax tree.

###### Arguments:

- error_level: the desired error level. Default: ErrorLevel.RAISE
- error_message_context: determines the amount of context to capture from a query string when displaying the error message (in number of characters). Default: 50.
- index_offset: Index offset for arrays eg ARRAY[0] vs ARRAY[1] as the head of a list. Default: 0
- alias_post_tablesample: If the table alias comes after tablesample. Default: False
- max_errors: Maximum number of error messages to include in a raised ParseError. This is only relevant if error_level is ErrorLevel.RAISE. Default: 3
- null_ordering: Indicates the default null ordering method to use if not explicitly set. Options are "nulls_are_small", "nulls_are_large", "nulls_are_last". Default: "nulls_are_small"

##### Inherited Members

sqlglot.parser.Parser
  Parser
  reset
  parse
  parse_into
  check_errors
  raise_error
  expression
  validate_expression

class ClickHouse.Generator(sqlglot.generator.Generator): View Source

    114    class Generator(generator.Generator):
    115        STRUCT_DELIMITER = ("(", ")")
    116
    117        TYPE_MAPPING = {
    118            **generator.Generator.TYPE_MAPPING,  # type: ignore
    119            exp.DataType.Type.NULLABLE: "Nullable",
    120            exp.DataType.Type.DATETIME: "DateTime64",
    121            exp.DataType.Type.MAP: "Map",
    122            exp.DataType.Type.ARRAY: "Array",
    123            exp.DataType.Type.STRUCT: "Tuple",
    124            exp.DataType.Type.TINYINT: "Int8",
    125            exp.DataType.Type.SMALLINT: "Int16",
    126            exp.DataType.Type.INT: "Int32",
    127            exp.DataType.Type.BIGINT: "Int64",
    128            exp.DataType.Type.FLOAT: "Float32",
    129            exp.DataType.Type.DOUBLE: "Float64",
    130        }
    131
    132        TRANSFORMS = {
    133            **generator.Generator.TRANSFORMS,  # type: ignore
    134            exp.Array: inline_array_sql,
    135            exp.ExponentialTimeDecayedAvg: lambda self, e: f"exponentialTimeDecayedAvg{self._param_args_sql(e, 'decay', ['this', 'time'])}",
    136            exp.Final: lambda self, e: f"{self.sql(e, 'this')} FINAL",
    137            exp.GroupUniqArray: lambda self, e: f"groupUniqArray{self._param_args_sql(e, 'size', 'this')}",
    138            exp.Histogram: lambda self, e: f"histogram{self._param_args_sql(e, 'bins', 'this')}",
    139            exp.Map: lambda self, e: _lower_func(var_map_sql(self, e)),
    140            exp.Quantile: lambda self, e: f"quantile{self._param_args_sql(e, 'quantile', 'this')}",
    141            exp.Quantiles: lambda self, e: f"quantiles{self._param_args_sql(e, 'parameters', 'expressions')}",
    142            exp.QuantileIf: lambda self, e: f"quantileIf{self._param_args_sql(e, 'parameters', 'expressions')}",
    143            exp.RegexpLike: lambda self, e: f"match({self.format_args(e.this, e.expression)})",
    144            exp.StrPosition: lambda self, e: f"position({self.format_args(e.this, e.args.get('substr'), e.args.get('position'))})",
    145            exp.VarMap: lambda self, e: _lower_func(var_map_sql(self, e)),
    146        }
    147
    148        PROPERTIES_LOCATION = {
    149            **generator.Generator.PROPERTIES_LOCATION,  # type: ignore
    150            exp.VolatileProperty: exp.Properties.Location.UNSUPPORTED,
    151        }
    152
    153        JOIN_HINTS = False
    154        TABLE_HINTS = False
    155        EXPLICIT_UNION = True
    156
    157        def _param_args_sql(
    158            self,
    159            expression: exp.Expression,
    160            param_names: str | t.List[str],
    161            arg_names: str | t.List[str],
    162        ) -> str:
    163            params = self.format_args(
    164                *(
    165                    arg
    166                    for name in ensure_list(param_names)
    167                    for arg in ensure_list(expression.args.get(name))
    168                )
    169            )
    170            args = self.format_args(
    171                *(
    172                    arg
    173                    for name in ensure_list(arg_names)
    174                    for arg in ensure_list(expression.args.get(name))
    175                )
    176            )
    177            return f"({params})({args})"
    178
    179        def cte_sql(self, expression: exp.CTE) -> str:
    180            if isinstance(expression.this, exp.Alias):
    181                return self.sql(expression, "this")
    182
    183            return super().cte_sql(expression)

Generator interprets the given syntax tree and produces a SQL string as an output.

###### Arguments:

- time_mapping (dict): the dictionary of custom time mappings in which the key represents a python time format and the output the target time format
- time_trie (trie): a trie of the time_mapping keys
- pretty (bool): if set to True the returned string will be formatted. Default: False.
- quote_start (str): specifies which starting character to use to delimit quotes. Default: '.
- quote_end (str): specifies which ending character to use to delimit quotes. Default: '.
- identifier_start (str): specifies which starting character to use to delimit identifiers. Default: ".
- identifier_end (str): specifies which ending character to use to delimit identifiers. Default: ".
- identify (bool | str): 'always': always quote, 'safe': quote identifiers if they don't contain an upcase, True defaults to always.
- normalize (bool): if set to True all identifiers will lower cased
- string_escape (str): specifies a string escape character. Default: '.
- identifier_escape (str): specifies an identifier escape character. Default: ".
- pad (int): determines padding in a formatted string. Default: 2.
- indent (int): determines the size of indentation in a formatted string. Default: 4.
- unnest_column_only (bool): if true unnest table aliases are considered only as column aliases
- normalize_functions (str): normalize function names, "upper", "lower", or None Default: "upper"
- alias_post_tablesample (bool): if the table alias comes after tablesample Default: False
- unsupported_level (ErrorLevel): determines the generator's behavior when it encounters unsupported expressions. Default ErrorLevel.WARN.
- null_ordering (str): Indicates the default null ordering method to use if not explicitly set. Options are "nulls_are_small", "nulls_are_large", "nulls_are_last". Default: "nulls_are_small"
- max_unsupported (int): Maximum number of unsupported messages to include in a raised UnsupportedError. This is only relevant if unsupported_level is ErrorLevel.RAISE. Default: 3
- leading_comma (bool): if the the comma is leading or trailing in select statements Default: False
- max_text_width: The max number of characters in a segment before creating new lines in pretty mode. The default is on the smaller end because the length only represents a segment and not the true line length. Default: 80
- comments: Whether or not to preserve comments in the output SQL code. Default: True

def cte_sql(self, expression: sqlglot.expressions.CTE) -> str: View Source

    179        def cte_sql(self, expression: exp.CTE) -> str:
    180            if isinstance(expression.this, exp.Alias):
    181                return self.sql(expression, "this")
    182
    183            return super().cte_sql(expression)

##### Inherited Members

sqlglot.generator.Generator
  Generator
  generate
  unsupported
  sep
  seg
  pad_comment
  maybe_comment
  wrap
  no_identify
  normalize_func
  indent
  sql
  uncache_sql
  cache_sql
  characterset_sql
  column_sql
  columnposition_sql
  columndef_sql
  columnconstraint_sql
  autoincrementcolumnconstraint_sql
  compresscolumnconstraint_sql
  generatedasidentitycolumnconstraint_sql
  notnullcolumnconstraint_sql
  primarykeycolumnconstraint_sql
  uniquecolumnconstraint_sql
  create_sql
  describe_sql
  prepend_ctes
  with_sql
  tablealias_sql
  bitstring_sql
  hexstring_sql
  bytestring_sql
  datatype_sql
  directory_sql
  delete_sql
  drop_sql
  except_sql
  except_op
  fetch_sql
  filter_sql
  hint_sql
  index_sql
  identifier_sql
  inputoutputformat_sql
  national_sql
  partition_sql
  properties_sql
  root_properties
  properties
  with_properties
  locate_properties
  property_sql
  likeproperty_sql
  fallbackproperty_sql
  journalproperty_sql
  freespaceproperty_sql
  afterjournalproperty_sql
  checksumproperty_sql
  mergeblockratioproperty_sql
  datablocksizeproperty_sql
  blockcompressionproperty_sql
  isolatedloadingproperty_sql
  lockingproperty_sql
  withdataproperty_sql
  insert_sql
  intersect_sql
  intersect_op
  introducer_sql
  pseudotype_sql
  onconflict_sql
  returning_sql
  rowformatdelimitedproperty_sql
  table_sql
  tablesample_sql
  pivot_sql
  tuple_sql
  update_sql
  values_sql
  var_sql
  into_sql
  from_sql
  group_sql
  having_sql
  join_sql
  lambda_sql
  lateral_sql
  limit_sql
  offset_sql
  setitem_sql
  set_sql
  pragma_sql
  lock_sql
  literal_sql
  loaddata_sql
  null_sql
  boolean_sql
  order_sql
  cluster_sql
  distribute_sql
  sort_sql
  ordered_sql
  matchrecognize_sql
  query_modifiers
  select_sql
  schema_sql
  star_sql
  structkwarg_sql
  parameter_sql
  sessionparameter_sql
  placeholder_sql
  subquery_sql
  qualify_sql
  union_sql
  union_op
  unnest_sql
  where_sql
  window_sql
  partition_by_sql
  windowspec_sql
  withingroup_sql
  between_sql
  bracket_sql
  all_sql
  any_sql
  exists_sql
  case_sql
  constraint_sql
  nextvaluefor_sql
  extract_sql
  trim_sql
  concat_sql
  check_sql
  foreignkey_sql
  primarykey_sql
  unique_sql
  if_sql
  matchagainst_sql
  jsonkeyvalue_sql
  jsonobject_sql
  in_sql
  in_unnest_op
  interval_sql
  return_sql
  reference_sql
  anonymous_sql
  paren_sql
  neg_sql
  not_sql
  alias_sql
  aliases_sql
  attimezone_sql
  add_sql
  and_sql
  connector_sql
  bitwiseand_sql
  bitwiseleftshift_sql
  bitwisenot_sql
  bitwiseor_sql
  bitwiserightshift_sql
  bitwisexor_sql
  cast_sql
  currentdate_sql
  collate_sql
  command_sql
  comment_sql
  transaction_sql
  commit_sql
  rollback_sql
  altercolumn_sql
  renametable_sql
  altertable_sql
  droppartition_sql
  addconstraint_sql
  distinct_sql
  ignorenulls_sql
  respectnulls_sql
  intdiv_sql
  dpipe_sql
  div_sql
  overlaps_sql
  distance_sql
  dot_sql
  eq_sql
  escape_sql
  glob_sql
  gt_sql
  gte_sql
  ilike_sql
  ilikeany_sql
  is_sql
  like_sql
  likeany_sql
  similarto_sql
  lt_sql
  lte_sql
  mod_sql
  mul_sql
  neq_sql
  nullsafeeq_sql
  nullsafeneq_sql
  or_sql
  slice_sql
  sub_sql
  trycast_sql
  use_sql
  binary
  function_fallback_sql
  func
  format_args
  text_width
  format_time
  expressions
  op_expressions
  naked_property
  set_operation
  tag_sql
  token_sql
  userdefinedfunction_sql
  joinhint_sql
  kwarg_sql
  when_sql
  merge_sql
  tochar_sql