138 lines
5.4 KiB
Python
138 lines
5.4 KiB
Python
from __future__ import annotations
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import typing as t
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from sqlglot import exp, generator, parser, tokens
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from sqlglot.dialects.dialect import Dialect, inline_array_sql, var_map_sql
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from sqlglot.errors import ParseError
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from sqlglot.parser import parse_var_map
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from sqlglot.tokens import TokenType
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def _lower_func(sql):
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index = sql.index("(")
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return sql[:index].lower() + sql[index:]
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class ClickHouse(Dialect):
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normalize_functions = None
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null_ordering = "nulls_are_last"
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class Tokenizer(tokens.Tokenizer):
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COMMENTS = ["--", "#", "#!", ("/*", "*/")]
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IDENTIFIERS = ['"', "`"]
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KEYWORDS = {
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**tokens.Tokenizer.KEYWORDS,
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"ASOF": TokenType.ASOF,
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"GLOBAL": TokenType.GLOBAL,
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"DATETIME64": TokenType.DATETIME,
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"FINAL": TokenType.FINAL,
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"FLOAT32": TokenType.FLOAT,
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"FLOAT64": TokenType.DOUBLE,
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"INT16": TokenType.SMALLINT,
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"INT32": TokenType.INT,
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"INT64": TokenType.BIGINT,
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"INT8": TokenType.TINYINT,
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"TUPLE": TokenType.STRUCT,
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}
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class Parser(parser.Parser):
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FUNCTIONS = {
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**parser.Parser.FUNCTIONS, # type: ignore
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"MAP": parse_var_map,
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"QUANTILE": lambda params, args: exp.Quantile(this=args, quantile=params),
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"QUANTILES": lambda params, args: exp.Quantiles(parameters=params, expressions=args),
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"QUANTILEIF": lambda params, args: exp.QuantileIf(parameters=params, expressions=args),
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}
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RANGE_PARSERS = {
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**parser.Parser.RANGE_PARSERS,
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TokenType.GLOBAL: lambda self, this: self._match(TokenType.IN)
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and self._parse_in(this, is_global=True),
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}
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JOIN_KINDS = {*parser.Parser.JOIN_KINDS, TokenType.ANY, TokenType.ASOF} # type: ignore
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TABLE_ALIAS_TOKENS = {*parser.Parser.TABLE_ALIAS_TOKENS} - {TokenType.ANY} # type: ignore
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def _parse_in(
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self, this: t.Optional[exp.Expression], is_global: bool = False
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) -> exp.Expression:
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this = super()._parse_in(this)
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this.set("is_global", is_global)
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return this
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def _parse_table(
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self, schema: bool = False, alias_tokens: t.Optional[t.Collection[TokenType]] = None
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) -> t.Optional[exp.Expression]:
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this = super()._parse_table(schema=schema, alias_tokens=alias_tokens)
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if self._match(TokenType.FINAL):
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this = self.expression(exp.Final, this=this)
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return this
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def _parse_position(self, haystack_first: bool = False) -> exp.Expression:
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return super()._parse_position(haystack_first=True)
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# https://clickhouse.com/docs/en/sql-reference/statements/select/with/
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def _parse_cte(self) -> exp.Expression:
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index = self._index
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try:
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# WITH <identifier> AS <subquery expression>
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return super()._parse_cte()
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except ParseError:
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# WITH <expression> AS <identifier>
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self._retreat(index)
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statement = self._parse_statement()
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if statement and isinstance(statement.this, exp.Alias):
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self.raise_error("Expected CTE to have alias")
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return self.expression(exp.CTE, this=statement, alias=statement and statement.this)
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class Generator(generator.Generator):
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STRUCT_DELIMITER = ("(", ")")
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TYPE_MAPPING = {
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**generator.Generator.TYPE_MAPPING, # type: ignore
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exp.DataType.Type.NULLABLE: "Nullable",
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exp.DataType.Type.DATETIME: "DateTime64",
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exp.DataType.Type.MAP: "Map",
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exp.DataType.Type.ARRAY: "Array",
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exp.DataType.Type.STRUCT: "Tuple",
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exp.DataType.Type.TINYINT: "Int8",
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exp.DataType.Type.SMALLINT: "Int16",
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exp.DataType.Type.INT: "Int32",
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exp.DataType.Type.BIGINT: "Int64",
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exp.DataType.Type.FLOAT: "Float32",
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exp.DataType.Type.DOUBLE: "Float64",
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}
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TRANSFORMS = {
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**generator.Generator.TRANSFORMS, # type: ignore
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exp.Array: inline_array_sql,
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exp.StrPosition: lambda self, e: f"position({self.format_args(e.this, e.args.get('substr'), e.args.get('position'))})",
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exp.Final: lambda self, e: f"{self.sql(e, 'this')} FINAL",
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exp.Map: lambda self, e: _lower_func(var_map_sql(self, e)),
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exp.VarMap: lambda self, e: _lower_func(var_map_sql(self, e)),
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exp.Quantile: lambda self, e: f"quantile{self._param_args_sql(e, 'quantile', 'this')}",
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exp.Quantiles: lambda self, e: f"quantiles{self._param_args_sql(e, 'parameters', 'expressions')}",
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exp.QuantileIf: lambda self, e: f"quantileIf{self._param_args_sql(e, 'parameters', 'expressions')}",
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}
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EXPLICIT_UNION = True
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def _param_args_sql(
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self, expression: exp.Expression, params_name: str, args_name: str
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) -> str:
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params = self.format_args(self.expressions(expression, params_name))
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args = self.format_args(self.expressions(expression, args_name))
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return f"({params})({args})"
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def cte_sql(self, expression: exp.CTE) -> str:
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if isinstance(expression.this, exp.Alias):
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return self.sql(expression, "this")
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return super().cte_sql(expression)
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