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from __future__ import annotations
import typing as t
from sqlglot import exp, generator, parser, tokens, transforms
from sqlglot.dialects.dialect import (
Dialect,
format_time_lambda,
max_or_greatest,
min_or_least,
)
from sqlglot.tokens import TokenType
class Teradata(Dialect):
class Tokenizer(tokens.Tokenizer):
# https://docs.teradata.com/r/Teradata-Database-SQL-Functions-Operators-Expressions-and-Predicates/March-2017/Comparison-Operators-and-Functions/Comparison-Operators/ANSI-Compliance
KEYWORDS = {
**tokens.Tokenizer.KEYWORDS,
"BYTEINT": TokenType.SMALLINT,
"SEL": TokenType.SELECT,
"INS": TokenType.INSERT,
"MOD": TokenType.MOD,
"LT": TokenType.LT,
"LE": TokenType.LTE,
"GT": TokenType.GT,
"GE": TokenType.GTE,
"^=": TokenType.NEQ,
"NE": TokenType.NEQ,
"NOT=": TokenType.NEQ,
"ST_GEOMETRY": TokenType.GEOMETRY,
}
# teradata does not support % for modulus
SINGLE_TOKENS = {**tokens.Tokenizer.SINGLE_TOKENS}
SINGLE_TOKENS.pop("%")
class Parser(parser.Parser):
CHARSET_TRANSLATORS = {
"GRAPHIC_TO_KANJISJIS",
"GRAPHIC_TO_LATIN",
"GRAPHIC_TO_UNICODE",
"GRAPHIC_TO_UNICODE_PadSpace",
"KANJI1_KanjiEBCDIC_TO_UNICODE",
"KANJI1_KanjiEUC_TO_UNICODE",
"KANJI1_KANJISJIS_TO_UNICODE",
"KANJI1_SBC_TO_UNICODE",
"KANJISJIS_TO_GRAPHIC",
"KANJISJIS_TO_LATIN",
"KANJISJIS_TO_UNICODE",
"LATIN_TO_GRAPHIC",
"LATIN_TO_KANJISJIS",
"LATIN_TO_UNICODE",
"LOCALE_TO_UNICODE",
"UNICODE_TO_GRAPHIC",
"UNICODE_TO_GRAPHIC_PadGraphic",
"UNICODE_TO_GRAPHIC_VarGraphic",
"UNICODE_TO_KANJI1_KanjiEBCDIC",
"UNICODE_TO_KANJI1_KanjiEUC",
"UNICODE_TO_KANJI1_KANJISJIS",
"UNICODE_TO_KANJI1_SBC",
"UNICODE_TO_KANJISJIS",
"UNICODE_TO_LATIN",
"UNICODE_TO_LOCALE",
"UNICODE_TO_UNICODE_FoldSpace",
"UNICODE_TO_UNICODE_Fullwidth",
"UNICODE_TO_UNICODE_Halfwidth",
"UNICODE_TO_UNICODE_NFC",
"UNICODE_TO_UNICODE_NFD",
"UNICODE_TO_UNICODE_NFKC",
"UNICODE_TO_UNICODE_NFKD",
}
FUNC_TOKENS = {*parser.Parser.FUNC_TOKENS}
FUNC_TOKENS.remove(TokenType.REPLACE)
STATEMENT_PARSERS = {
**parser.Parser.STATEMENT_PARSERS,
TokenType.REPLACE: lambda self: self._parse_create(),
}
FUNCTION_PARSERS = {
**parser.Parser.FUNCTION_PARSERS,
"RANGE_N": lambda self: self._parse_rangen(),
"TRANSLATE": lambda self: self._parse_translate(self.STRICT_CAST),
}
def _parse_translate(self, strict: bool) -> exp.Expression:
this = self._parse_conjunction()
if not self._match(TokenType.USING):
self.raise_error("Expected USING in TRANSLATE")
if self._match_texts(self.CHARSET_TRANSLATORS):
charset_split = self._prev.text.split("_TO_")
to = self.expression(exp.CharacterSet, this=charset_split[1])
else:
self.raise_error("Expected a character set translator after USING in TRANSLATE")
return self.expression(exp.Cast if strict else exp.TryCast, this=this, to=to)
# FROM before SET in Teradata UPDATE syntax
# 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
def _parse_update(self) -> exp.Expression:
return self.expression(
exp.Update,
**{ # type: ignore
"this": self._parse_table(alias_tokens=self.UPDATE_ALIAS_TOKENS),
"from": self._parse_from(modifiers=True),
"expressions": self._match(TokenType.SET)
and self._parse_csv(self._parse_equality),
"where": self._parse_where(),
},
)
def _parse_rangen(self):
this = self._parse_id_var()
self._match(TokenType.BETWEEN)
expressions = self._parse_csv(self._parse_conjunction)
each = self._match_text_seq("EACH") and self._parse_conjunction()
return self.expression(exp.RangeN, this=this, expressions=expressions, each=each)
def _parse_cast(self, strict: bool) -> exp.Expression:
cast = t.cast(exp.Cast, super()._parse_cast(strict))
if cast.to.this == exp.DataType.Type.DATE and self._match(TokenType.FORMAT):
return format_time_lambda(exp.TimeToStr, "teradata")(
[cast.this, self._parse_string()]
)
return cast
class Generator(generator.Generator):
JOIN_HINTS = False
TABLE_HINTS = False
TYPE_MAPPING = {
**generator.Generator.TYPE_MAPPING,
exp.DataType.Type.GEOMETRY: "ST_GEOMETRY",
}
PROPERTIES_LOCATION = {
**generator.Generator.PROPERTIES_LOCATION,
exp.OnCommitProperty: exp.Properties.Location.POST_INDEX,
exp.PartitionedByProperty: exp.Properties.Location.POST_EXPRESSION,
exp.StabilityProperty: exp.Properties.Location.POST_CREATE,
}
TRANSFORMS = {
**generator.Generator.TRANSFORMS,
exp.Max: max_or_greatest,
exp.Min: min_or_least,
exp.Select: transforms.preprocess([transforms.eliminate_distinct_on]),
exp.TimeToStr: lambda self, e: f"CAST({self.sql(e, 'this')} AS DATE FORMAT {self.format_time(e)})",
exp.ToChar: lambda self, e: self.function_fallback_sql(e),
}
def partitionedbyproperty_sql(self, expression: exp.PartitionedByProperty) -> str:
return f"PARTITION BY {self.sql(expression, 'this')}"
# FROM before SET in Teradata UPDATE syntax
# 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
def update_sql(self, expression: exp.Update) -> str:
this = self.sql(expression, "this")
from_sql = self.sql(expression, "from")
set_sql = self.expressions(expression, flat=True)
where_sql = self.sql(expression, "where")
sql = f"UPDATE {this}{from_sql} SET {set_sql}{where_sql}"
return self.prepend_ctes(expression, sql)
def mod_sql(self, expression: exp.Mod) -> str:
return self.binary(expression, "MOD")
def datatype_sql(self, expression: exp.DataType) -> str:
type_sql = super().datatype_sql(expression)
prefix_sql = expression.args.get("prefix")
return f"SYSUDTLIB.{type_sql}" if prefix_sql else type_sql
def rangen_sql(self, expression: exp.RangeN) -> str:
this = self.sql(expression, "this")
expressions_sql = self.expressions(expression)
each_sql = self.sql(expression, "each")
each_sql = f" EACH {each_sql}" if each_sql else ""
return f"RANGE_N({this} BETWEEN {expressions_sql}{each_sql})"
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