sqlglot.dialects.teradata API documentation

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# sqlglot.dialects.teradata

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      1from __future__ import annotations
      2
      3import typing as t
      4
      5from sqlglot import exp, generator, parser, tokens, transforms
      6from sqlglot.dialects.dialect import (
      7    Dialect,
      8    format_time_lambda,
      9    max_or_greatest,
     10    min_or_least,
     11)
     12from sqlglot.tokens import TokenType
     13
     14
     15class Teradata(Dialect):
     16    class Tokenizer(tokens.Tokenizer):
     17        # https://docs.teradata.com/r/Teradata-Database-SQL-Functions-Operators-Expressions-and-Predicates/March-2017/Comparison-Operators-and-Functions/Comparison-Operators/ANSI-Compliance
     18        KEYWORDS = {
     19            **tokens.Tokenizer.KEYWORDS,
     20            "BYTEINT": TokenType.SMALLINT,
     21            "SEL": TokenType.SELECT,
     22            "INS": TokenType.INSERT,
     23            "MOD": TokenType.MOD,
     24            "LT": TokenType.LT,
     25            "LE": TokenType.LTE,
     26            "GT": TokenType.GT,
     27            "GE": TokenType.GTE,
     28            "^=": TokenType.NEQ,
     29            "NE": TokenType.NEQ,
     30            "NOT=": TokenType.NEQ,
     31            "ST_GEOMETRY": TokenType.GEOMETRY,
     32        }
     33
     34        # teradata does not support % for modulus
     35        SINGLE_TOKENS = {**tokens.Tokenizer.SINGLE_TOKENS}
     36        SINGLE_TOKENS.pop("%")
     37
     38    class Parser(parser.Parser):
     39        CHARSET_TRANSLATORS = {
     40            "GRAPHIC_TO_KANJISJIS",
     41            "GRAPHIC_TO_LATIN",
     42            "GRAPHIC_TO_UNICODE",
     43            "GRAPHIC_TO_UNICODE_PadSpace",
     44            "KANJI1_KanjiEBCDIC_TO_UNICODE",
     45            "KANJI1_KanjiEUC_TO_UNICODE",
     46            "KANJI1_KANJISJIS_TO_UNICODE",
     47            "KANJI1_SBC_TO_UNICODE",
     48            "KANJISJIS_TO_GRAPHIC",
     49            "KANJISJIS_TO_LATIN",
     50            "KANJISJIS_TO_UNICODE",
     51            "LATIN_TO_GRAPHIC",
     52            "LATIN_TO_KANJISJIS",
     53            "LATIN_TO_UNICODE",
     54            "LOCALE_TO_UNICODE",
     55            "UNICODE_TO_GRAPHIC",
     56            "UNICODE_TO_GRAPHIC_PadGraphic",
     57            "UNICODE_TO_GRAPHIC_VarGraphic",
     58            "UNICODE_TO_KANJI1_KanjiEBCDIC",
     59            "UNICODE_TO_KANJI1_KanjiEUC",
     60            "UNICODE_TO_KANJI1_KANJISJIS",
     61            "UNICODE_TO_KANJI1_SBC",
     62            "UNICODE_TO_KANJISJIS",
     63            "UNICODE_TO_LATIN",
     64            "UNICODE_TO_LOCALE",
     65            "UNICODE_TO_UNICODE_FoldSpace",
     66            "UNICODE_TO_UNICODE_Fullwidth",
     67            "UNICODE_TO_UNICODE_Halfwidth",
     68            "UNICODE_TO_UNICODE_NFC",
     69            "UNICODE_TO_UNICODE_NFD",
     70            "UNICODE_TO_UNICODE_NFKC",
     71            "UNICODE_TO_UNICODE_NFKD",
     72        }
     73
     74        FUNC_TOKENS = {*parser.Parser.FUNC_TOKENS}
     75        FUNC_TOKENS.remove(TokenType.REPLACE)
     76
     77        STATEMENT_PARSERS = {
     78            **parser.Parser.STATEMENT_PARSERS,
     79            TokenType.REPLACE: lambda self: self._parse_create(),
     80        }
     81
     82        FUNCTION_PARSERS = {
     83            **parser.Parser.FUNCTION_PARSERS,
     84            "RANGE_N": lambda self: self._parse_rangen(),
     85            "TRANSLATE": lambda self: self._parse_translate(self.STRICT_CAST),
     86        }
     87
     88        def _parse_translate(self, strict: bool) -> exp.Expression:
     89            this = self._parse_conjunction()
     90
     91            if not self._match(TokenType.USING):
     92                self.raise_error("Expected USING in TRANSLATE")
     93
     94            if self._match_texts(self.CHARSET_TRANSLATORS):
     95                charset_split = self._prev.text.split("_TO_")
     96                to = self.expression(exp.CharacterSet, this=charset_split[1])
     97            else:
     98                self.raise_error("Expected a character set translator after USING in TRANSLATE")
     99
    100            return self.expression(exp.Cast if strict else exp.TryCast, this=this, to=to)
    101
    102        # FROM before SET in Teradata UPDATE syntax
    103        # https://docs.teradata.com/r/Enterprise_IntelliFlex_VMware/Teradata-VantageTM-SQL-Data-Manipulation-Language-17.20/Statement-Syntax/UPDATE/UPDATE-Syntax-Basic-Form-FROM-Clause
    104        def _parse_update(self) -> exp.Expression:
    105            return self.expression(
    106                exp.Update,
    107                **{  # type: ignore
    108                    "this": self._parse_table(alias_tokens=self.UPDATE_ALIAS_TOKENS),
    109                    "from": self._parse_from(modifiers=True),
    110                    "expressions": self._match(TokenType.SET)
    111                    and self._parse_csv(self._parse_equality),
    112                    "where": self._parse_where(),
    113                },
    114            )
    115
    116        def _parse_rangen(self):
    117            this = self._parse_id_var()
    118            self._match(TokenType.BETWEEN)
    119
    120            expressions = self._parse_csv(self._parse_conjunction)
    121            each = self._match_text_seq("EACH") and self._parse_conjunction()
    122
    123            return self.expression(exp.RangeN, this=this, expressions=expressions, each=each)
    124
    125        def _parse_cast(self, strict: bool) -> exp.Expression:
    126            cast = t.cast(exp.Cast, super()._parse_cast(strict))
    127            if cast.to.this == exp.DataType.Type.DATE and self._match(TokenType.FORMAT):
    128                return format_time_lambda(exp.TimeToStr, "teradata")(
    129                    [cast.this, self._parse_string()]
    130                )
    131            return cast
    132
    133    class Generator(generator.Generator):
    134        JOIN_HINTS = False
    135        TABLE_HINTS = False
    136
    137        TYPE_MAPPING = {
    138            **generator.Generator.TYPE_MAPPING,
    139            exp.DataType.Type.GEOMETRY: "ST_GEOMETRY",
    140        }
    141
    142        PROPERTIES_LOCATION = {
    143            **generator.Generator.PROPERTIES_LOCATION,
    144            exp.OnCommitProperty: exp.Properties.Location.POST_INDEX,
    145            exp.PartitionedByProperty: exp.Properties.Location.POST_INDEX,
    146            exp.StabilityProperty: exp.Properties.Location.POST_CREATE,
    147        }
    148
    149        TRANSFORMS = {
    150            **generator.Generator.TRANSFORMS,
    151            exp.Max: max_or_greatest,
    152            exp.Min: min_or_least,
    153            exp.Select: transforms.preprocess([transforms.eliminate_distinct_on]),
    154            exp.TimeToStr: lambda self, e: f"CAST({self.sql(e, 'this')} AS DATE FORMAT {self.format_time(e)})",
    155            exp.ToChar: lambda self, e: self.function_fallback_sql(e),
    156        }
    157
    158        def partitionedbyproperty_sql(self, expression: exp.PartitionedByProperty) -> str:
    159            return f"PARTITION BY {self.sql(expression, 'this')}"
    160
    161        # FROM before SET in Teradata UPDATE syntax
    162        # https://docs.teradata.com/r/Enterprise_IntelliFlex_VMware/Teradata-VantageTM-SQL-Data-Manipulation-Language-17.20/Statement-Syntax/UPDATE/UPDATE-Syntax-Basic-Form-FROM-Clause
    163        def update_sql(self, expression: exp.Update) -> str:
    164            this = self.sql(expression, "this")
    165            from_sql = self.sql(expression, "from")
    166            set_sql = self.expressions(expression, flat=True)
    167            where_sql = self.sql(expression, "where")
    168            sql = f"UPDATE {this}{from_sql} SET {set_sql}{where_sql}"
    169            return self.prepend_ctes(expression, sql)
    170
    171        def mod_sql(self, expression: exp.Mod) -> str:
    172            return self.binary(expression, "MOD")
    173
    174        def datatype_sql(self, expression: exp.DataType) -> str:
    175            type_sql = super().datatype_sql(expression)
    176            prefix_sql = expression.args.get("prefix")
    177            return f"SYSUDTLIB.{type_sql}" if prefix_sql else type_sql
    178
    179        def rangen_sql(self, expression: exp.RangeN) -> str:
    180            this = self.sql(expression, "this")
    181            expressions_sql = self.expressions(expression)
    182            each_sql = self.sql(expression, "each")
    183            each_sql = f" EACH {each_sql}" if each_sql else ""
    184
    185            return f"RANGE_N({this} BETWEEN {expressions_sql}{each_sql})"

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

     16class Teradata(Dialect):
     17    class Tokenizer(tokens.Tokenizer):
     18        # https://docs.teradata.com/r/Teradata-Database-SQL-Functions-Operators-Expressions-and-Predicates/March-2017/Comparison-Operators-and-Functions/Comparison-Operators/ANSI-Compliance
     19        KEYWORDS = {
     20            **tokens.Tokenizer.KEYWORDS,
     21            "BYTEINT": TokenType.SMALLINT,
     22            "SEL": TokenType.SELECT,
     23            "INS": TokenType.INSERT,
     24            "MOD": TokenType.MOD,
     25            "LT": TokenType.LT,
     26            "LE": TokenType.LTE,
     27            "GT": TokenType.GT,
     28            "GE": TokenType.GTE,
     29            "^=": TokenType.NEQ,
     30            "NE": TokenType.NEQ,
     31            "NOT=": TokenType.NEQ,
     32            "ST_GEOMETRY": TokenType.GEOMETRY,
     33        }
     34
     35        # teradata does not support % for modulus
     36        SINGLE_TOKENS = {**tokens.Tokenizer.SINGLE_TOKENS}
     37        SINGLE_TOKENS.pop("%")
     38
     39    class Parser(parser.Parser):
     40        CHARSET_TRANSLATORS = {
     41            "GRAPHIC_TO_KANJISJIS",
     42            "GRAPHIC_TO_LATIN",
     43            "GRAPHIC_TO_UNICODE",
     44            "GRAPHIC_TO_UNICODE_PadSpace",
     45            "KANJI1_KanjiEBCDIC_TO_UNICODE",
     46            "KANJI1_KanjiEUC_TO_UNICODE",
     47            "KANJI1_KANJISJIS_TO_UNICODE",
     48            "KANJI1_SBC_TO_UNICODE",
     49            "KANJISJIS_TO_GRAPHIC",
     50            "KANJISJIS_TO_LATIN",
     51            "KANJISJIS_TO_UNICODE",
     52            "LATIN_TO_GRAPHIC",
     53            "LATIN_TO_KANJISJIS",
     54            "LATIN_TO_UNICODE",
     55            "LOCALE_TO_UNICODE",
     56            "UNICODE_TO_GRAPHIC",
     57            "UNICODE_TO_GRAPHIC_PadGraphic",
     58            "UNICODE_TO_GRAPHIC_VarGraphic",
     59            "UNICODE_TO_KANJI1_KanjiEBCDIC",
     60            "UNICODE_TO_KANJI1_KanjiEUC",
     61            "UNICODE_TO_KANJI1_KANJISJIS",
     62            "UNICODE_TO_KANJI1_SBC",
     63            "UNICODE_TO_KANJISJIS",
     64            "UNICODE_TO_LATIN",
     65            "UNICODE_TO_LOCALE",
     66            "UNICODE_TO_UNICODE_FoldSpace",
     67            "UNICODE_TO_UNICODE_Fullwidth",
     68            "UNICODE_TO_UNICODE_Halfwidth",
     69            "UNICODE_TO_UNICODE_NFC",
     70            "UNICODE_TO_UNICODE_NFD",
     71            "UNICODE_TO_UNICODE_NFKC",
     72            "UNICODE_TO_UNICODE_NFKD",
     73        }
     74
     75        FUNC_TOKENS = {*parser.Parser.FUNC_TOKENS}
     76        FUNC_TOKENS.remove(TokenType.REPLACE)
     77
     78        STATEMENT_PARSERS = {
     79            **parser.Parser.STATEMENT_PARSERS,
     80            TokenType.REPLACE: lambda self: self._parse_create(),
     81        }
     82
     83        FUNCTION_PARSERS = {
     84            **parser.Parser.FUNCTION_PARSERS,
     85            "RANGE_N": lambda self: self._parse_rangen(),
     86            "TRANSLATE": lambda self: self._parse_translate(self.STRICT_CAST),
     87        }
     88
     89        def _parse_translate(self, strict: bool) -> exp.Expression:
     90            this = self._parse_conjunction()
     91
     92            if not self._match(TokenType.USING):
     93                self.raise_error("Expected USING in TRANSLATE")
     94
     95            if self._match_texts(self.CHARSET_TRANSLATORS):
     96                charset_split = self._prev.text.split("_TO_")
     97                to = self.expression(exp.CharacterSet, this=charset_split[1])
     98            else:
     99                self.raise_error("Expected a character set translator after USING in TRANSLATE")
    100
    101            return self.expression(exp.Cast if strict else exp.TryCast, this=this, to=to)
    102
    103        # FROM before SET in Teradata UPDATE syntax
    104        # https://docs.teradata.com/r/Enterprise_IntelliFlex_VMware/Teradata-VantageTM-SQL-Data-Manipulation-Language-17.20/Statement-Syntax/UPDATE/UPDATE-Syntax-Basic-Form-FROM-Clause
    105        def _parse_update(self) -> exp.Expression:
    106            return self.expression(
    107                exp.Update,
    108                **{  # type: ignore
    109                    "this": self._parse_table(alias_tokens=self.UPDATE_ALIAS_TOKENS),
    110                    "from": self._parse_from(modifiers=True),
    111                    "expressions": self._match(TokenType.SET)
    112                    and self._parse_csv(self._parse_equality),
    113                    "where": self._parse_where(),
    114                },
    115            )
    116
    117        def _parse_rangen(self):
    118            this = self._parse_id_var()
    119            self._match(TokenType.BETWEEN)
    120
    121            expressions = self._parse_csv(self._parse_conjunction)
    122            each = self._match_text_seq("EACH") and self._parse_conjunction()
    123
    124            return self.expression(exp.RangeN, this=this, expressions=expressions, each=each)
    125
    126        def _parse_cast(self, strict: bool) -> exp.Expression:
    127            cast = t.cast(exp.Cast, super()._parse_cast(strict))
    128            if cast.to.this == exp.DataType.Type.DATE and self._match(TokenType.FORMAT):
    129                return format_time_lambda(exp.TimeToStr, "teradata")(
    130                    [cast.this, self._parse_string()]
    131                )
    132            return cast
    133
    134    class Generator(generator.Generator):
    135        JOIN_HINTS = False
    136        TABLE_HINTS = False
    137
    138        TYPE_MAPPING = {
    139            **generator.Generator.TYPE_MAPPING,
    140            exp.DataType.Type.GEOMETRY: "ST_GEOMETRY",
    141        }
    142
    143        PROPERTIES_LOCATION = {
    144            **generator.Generator.PROPERTIES_LOCATION,
    145            exp.OnCommitProperty: exp.Properties.Location.POST_INDEX,
    146            exp.PartitionedByProperty: exp.Properties.Location.POST_INDEX,
    147            exp.StabilityProperty: exp.Properties.Location.POST_CREATE,
    148        }
    149
    150        TRANSFORMS = {
    151            **generator.Generator.TRANSFORMS,
    152            exp.Max: max_or_greatest,
    153            exp.Min: min_or_least,
    154            exp.Select: transforms.preprocess([transforms.eliminate_distinct_on]),
    155            exp.TimeToStr: lambda self, e: f"CAST({self.sql(e, 'this')} AS DATE FORMAT {self.format_time(e)})",
    156            exp.ToChar: lambda self, e: self.function_fallback_sql(e),
    157        }
    158
    159        def partitionedbyproperty_sql(self, expression: exp.PartitionedByProperty) -> str:
    160            return f"PARTITION BY {self.sql(expression, 'this')}"
    161
    162        # FROM before SET in Teradata UPDATE syntax
    163        # https://docs.teradata.com/r/Enterprise_IntelliFlex_VMware/Teradata-VantageTM-SQL-Data-Manipulation-Language-17.20/Statement-Syntax/UPDATE/UPDATE-Syntax-Basic-Form-FROM-Clause
    164        def update_sql(self, expression: exp.Update) -> str:
    165            this = self.sql(expression, "this")
    166            from_sql = self.sql(expression, "from")
    167            set_sql = self.expressions(expression, flat=True)
    168            where_sql = self.sql(expression, "where")
    169            sql = f"UPDATE {this}{from_sql} SET {set_sql}{where_sql}"
    170            return self.prepend_ctes(expression, sql)
    171
    172        def mod_sql(self, expression: exp.Mod) -> str:
    173            return self.binary(expression, "MOD")
    174
    175        def datatype_sql(self, expression: exp.DataType) -> str:
    176            type_sql = super().datatype_sql(expression)
    177            prefix_sql = expression.args.get("prefix")
    178            return f"SYSUDTLIB.{type_sql}" if prefix_sql else type_sql
    179
    180        def rangen_sql(self, expression: exp.RangeN) -> str:
    181            this = self.sql(expression, "this")
    182            expressions_sql = self.expressions(expression)
    183            each_sql = self.sql(expression, "each")
    184            each_sql = f" EACH {each_sql}" if each_sql else ""
    185
    186            return f"RANGE_N({this} BETWEEN {expressions_sql}{each_sql})"

##### Inherited Members

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

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

    17    class Tokenizer(tokens.Tokenizer):
    18        # https://docs.teradata.com/r/Teradata-Database-SQL-Functions-Operators-Expressions-and-Predicates/March-2017/Comparison-Operators-and-Functions/Comparison-Operators/ANSI-Compliance
    19        KEYWORDS = {
    20            **tokens.Tokenizer.KEYWORDS,
    21            "BYTEINT": TokenType.SMALLINT,
    22            "SEL": TokenType.SELECT,
    23            "INS": TokenType.INSERT,
    24            "MOD": TokenType.MOD,
    25            "LT": TokenType.LT,
    26            "LE": TokenType.LTE,
    27            "GT": TokenType.GT,
    28            "GE": TokenType.GTE,
    29            "^=": TokenType.NEQ,
    30            "NE": TokenType.NEQ,
    31            "NOT=": TokenType.NEQ,
    32            "ST_GEOMETRY": TokenType.GEOMETRY,
    33        }
    34
    35        # teradata does not support % for modulus
    36        SINGLE_TOKENS = {**tokens.Tokenizer.SINGLE_TOKENS}
    37        SINGLE_TOKENS.pop("%")

##### Inherited Members

sqlglot.tokens.Tokenizer
  reset
  tokenize

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

     39    class Parser(parser.Parser):
     40        CHARSET_TRANSLATORS = {
     41            "GRAPHIC_TO_KANJISJIS",
     42            "GRAPHIC_TO_LATIN",
     43            "GRAPHIC_TO_UNICODE",
     44            "GRAPHIC_TO_UNICODE_PadSpace",
     45            "KANJI1_KanjiEBCDIC_TO_UNICODE",
     46            "KANJI1_KanjiEUC_TO_UNICODE",
     47            "KANJI1_KANJISJIS_TO_UNICODE",
     48            "KANJI1_SBC_TO_UNICODE",
     49            "KANJISJIS_TO_GRAPHIC",
     50            "KANJISJIS_TO_LATIN",
     51            "KANJISJIS_TO_UNICODE",
     52            "LATIN_TO_GRAPHIC",
     53            "LATIN_TO_KANJISJIS",
     54            "LATIN_TO_UNICODE",
     55            "LOCALE_TO_UNICODE",
     56            "UNICODE_TO_GRAPHIC",
     57            "UNICODE_TO_GRAPHIC_PadGraphic",
     58            "UNICODE_TO_GRAPHIC_VarGraphic",
     59            "UNICODE_TO_KANJI1_KanjiEBCDIC",
     60            "UNICODE_TO_KANJI1_KanjiEUC",
     61            "UNICODE_TO_KANJI1_KANJISJIS",
     62            "UNICODE_TO_KANJI1_SBC",
     63            "UNICODE_TO_KANJISJIS",
     64            "UNICODE_TO_LATIN",
     65            "UNICODE_TO_LOCALE",
     66            "UNICODE_TO_UNICODE_FoldSpace",
     67            "UNICODE_TO_UNICODE_Fullwidth",
     68            "UNICODE_TO_UNICODE_Halfwidth",
     69            "UNICODE_TO_UNICODE_NFC",
     70            "UNICODE_TO_UNICODE_NFD",
     71            "UNICODE_TO_UNICODE_NFKC",
     72            "UNICODE_TO_UNICODE_NFKD",
     73        }
     74
     75        FUNC_TOKENS = {*parser.Parser.FUNC_TOKENS}
     76        FUNC_TOKENS.remove(TokenType.REPLACE)
     77
     78        STATEMENT_PARSERS = {
     79            **parser.Parser.STATEMENT_PARSERS,
     80            TokenType.REPLACE: lambda self: self._parse_create(),
     81        }
     82
     83        FUNCTION_PARSERS = {
     84            **parser.Parser.FUNCTION_PARSERS,
     85            "RANGE_N": lambda self: self._parse_rangen(),
     86            "TRANSLATE": lambda self: self._parse_translate(self.STRICT_CAST),
     87        }
     88
     89        def _parse_translate(self, strict: bool) -> exp.Expression:
     90            this = self._parse_conjunction()
     91
     92            if not self._match(TokenType.USING):
     93                self.raise_error("Expected USING in TRANSLATE")
     94
     95            if self._match_texts(self.CHARSET_TRANSLATORS):
     96                charset_split = self._prev.text.split("_TO_")
     97                to = self.expression(exp.CharacterSet, this=charset_split[1])
     98            else:
     99                self.raise_error("Expected a character set translator after USING in TRANSLATE")
    100
    101            return self.expression(exp.Cast if strict else exp.TryCast, this=this, to=to)
    102
    103        # FROM before SET in Teradata UPDATE syntax
    104        # https://docs.teradata.com/r/Enterprise_IntelliFlex_VMware/Teradata-VantageTM-SQL-Data-Manipulation-Language-17.20/Statement-Syntax/UPDATE/UPDATE-Syntax-Basic-Form-FROM-Clause
    105        def _parse_update(self) -> exp.Expression:
    106            return self.expression(
    107                exp.Update,
    108                **{  # type: ignore
    109                    "this": self._parse_table(alias_tokens=self.UPDATE_ALIAS_TOKENS),
    110                    "from": self._parse_from(modifiers=True),
    111                    "expressions": self._match(TokenType.SET)
    112                    and self._parse_csv(self._parse_equality),
    113                    "where": self._parse_where(),
    114                },
    115            )
    116
    117        def _parse_rangen(self):
    118            this = self._parse_id_var()
    119            self._match(TokenType.BETWEEN)
    120
    121            expressions = self._parse_csv(self._parse_conjunction)
    122            each = self._match_text_seq("EACH") and self._parse_conjunction()
    123
    124            return self.expression(exp.RangeN, this=this, expressions=expressions, each=each)
    125
    126        def _parse_cast(self, strict: bool) -> exp.Expression:
    127            cast = t.cast(exp.Cast, super()._parse_cast(strict))
    128            if cast.to.this == exp.DataType.Type.DATE and self._match(TokenType.FORMAT):
    129                return format_time_lambda(exp.TimeToStr, "teradata")(
    130                    [cast.this, self._parse_string()]
    131                )
    132            return cast

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 Teradata.Generator(sqlglot.generator.Generator): View Source

    134    class Generator(generator.Generator):
    135        JOIN_HINTS = False
    136        TABLE_HINTS = False
    137
    138        TYPE_MAPPING = {
    139            **generator.Generator.TYPE_MAPPING,
    140            exp.DataType.Type.GEOMETRY: "ST_GEOMETRY",
    141        }
    142
    143        PROPERTIES_LOCATION = {
    144            **generator.Generator.PROPERTIES_LOCATION,
    145            exp.OnCommitProperty: exp.Properties.Location.POST_INDEX,
    146            exp.PartitionedByProperty: exp.Properties.Location.POST_INDEX,
    147            exp.StabilityProperty: exp.Properties.Location.POST_CREATE,
    148        }
    149
    150        TRANSFORMS = {
    151            **generator.Generator.TRANSFORMS,
    152            exp.Max: max_or_greatest,
    153            exp.Min: min_or_least,
    154            exp.Select: transforms.preprocess([transforms.eliminate_distinct_on]),
    155            exp.TimeToStr: lambda self, e: f"CAST({self.sql(e, 'this')} AS DATE FORMAT {self.format_time(e)})",
    156            exp.ToChar: lambda self, e: self.function_fallback_sql(e),
    157        }
    158
    159        def partitionedbyproperty_sql(self, expression: exp.PartitionedByProperty) -> str:
    160            return f"PARTITION BY {self.sql(expression, 'this')}"
    161
    162        # FROM before SET in Teradata UPDATE syntax
    163        # https://docs.teradata.com/r/Enterprise_IntelliFlex_VMware/Teradata-VantageTM-SQL-Data-Manipulation-Language-17.20/Statement-Syntax/UPDATE/UPDATE-Syntax-Basic-Form-FROM-Clause
    164        def update_sql(self, expression: exp.Update) -> str:
    165            this = self.sql(expression, "this")
    166            from_sql = self.sql(expression, "from")
    167            set_sql = self.expressions(expression, flat=True)
    168            where_sql = self.sql(expression, "where")
    169            sql = f"UPDATE {this}{from_sql} SET {set_sql}{where_sql}"
    170            return self.prepend_ctes(expression, sql)
    171
    172        def mod_sql(self, expression: exp.Mod) -> str:
    173            return self.binary(expression, "MOD")
    174
    175        def datatype_sql(self, expression: exp.DataType) -> str:
    176            type_sql = super().datatype_sql(expression)
    177            prefix_sql = expression.args.get("prefix")
    178            return f"SYSUDTLIB.{type_sql}" if prefix_sql else type_sql
    179
    180        def rangen_sql(self, expression: exp.RangeN) -> str:
    181            this = self.sql(expression, "this")
    182            expressions_sql = self.expressions(expression)
    183            each_sql = self.sql(expression, "each")
    184            each_sql = f" EACH {each_sql}" if each_sql else ""
    185
    186            return f"RANGE_N({this} BETWEEN {expressions_sql}{each_sql})"

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: ".
- bit_start (str): specifies which starting character to use to delimit bit literals. Default: None.
- bit_end (str): specifies which ending character to use to delimit bit literals. Default: None.
- hex_start (str): specifies which starting character to use to delimit hex literals. Default: None.
- hex_end (str): specifies which ending character to use to delimit hex literals. Default: None.
- byte_start (str): specifies which starting character to use to delimit byte literals. Default: None.
- byte_end (str): specifies which ending character to use to delimit byte literals. Default: None.
- raw_start (str): specifies which starting character to use to delimit raw literals. Default: None.
- raw_end (str): specifies which ending character to use to delimit raw literals. Default: None.
- 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 partitionedbyproperty_sql(self, expression: sqlglot.expressions.PartitionedByProperty) -> str: View Source

    159        def partitionedbyproperty_sql(self, expression: exp.PartitionedByProperty) -> str:
    160            return f"PARTITION BY {self.sql(expression, 'this')}"

def update_sql(self, expression: sqlglot.expressions.Update) -> str: View Source

    164        def update_sql(self, expression: exp.Update) -> str:
    165            this = self.sql(expression, "this")
    166            from_sql = self.sql(expression, "from")
    167            set_sql = self.expressions(expression, flat=True)
    168            where_sql = self.sql(expression, "where")
    169            sql = f"UPDATE {this}{from_sql} SET {set_sql}{where_sql}"
    170            return self.prepend_ctes(expression, sql)

def mod_sql(self, expression: sqlglot.expressions.Mod) -> str: View Source

    172        def mod_sql(self, expression: exp.Mod) -> str:
    173            return self.binary(expression, "MOD")

def datatype_sql(self, expression: sqlglot.expressions.DataType) -> str: View Source

    175        def datatype_sql(self, expression: exp.DataType) -> str:
    176            type_sql = super().datatype_sql(expression)
    177            prefix_sql = expression.args.get("prefix")
    178            return f"SYSUDTLIB.{type_sql}" if prefix_sql else type_sql

def rangen_sql(self, expression: sqlglot.expressions.RangeN) -> str: View Source

    180        def rangen_sql(self, expression: exp.RangeN) -> str:
    181            this = self.sql(expression, "this")
    182            expressions_sql = self.expressions(expression)
    183            each_sql = self.sql(expression, "each")
    184            each_sql = f" EACH {each_sql}" if each_sql else ""
    185
    186            return f"RANGE_N({this} BETWEEN {expressions_sql}{each_sql})"

##### 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
  clone_sql
  describe_sql
  prepend_ctes
  with_sql
  cte_sql
  tablealias_sql
  bitstring_sql
  hexstring_sql
  bytestring_sql
  rawstring_sql
  datatypesize_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
  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
  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
  after_having_modifiers
  after_limit_modifiers
  select_sql
  schema_sql
  star_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
  openjsoncolumndef_sql
  openjson_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
  mergetreettlaction_sql
  mergetreettl_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
  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