1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
from __future__ import annotations
import typing as t
from sqlglot import exp, generator, parser, tokens
from sqlglot.dialects.dialect import Dialect, inline_array_sql, var_map_sql
from sqlglot.errors import ParseError
from sqlglot.parser import parse_var_map
from sqlglot.tokens import TokenType
def _lower_func(sql):
index = sql.index("(")
return sql[:index].lower() + sql[index:]
class ClickHouse(Dialect):
normalize_functions = None
null_ordering = "nulls_are_last"
class Tokenizer(tokens.Tokenizer):
COMMENTS = ["--", "#", "#!", ("/*", "*/")]
IDENTIFIERS = ['"', "`"]
KEYWORDS = {
**tokens.Tokenizer.KEYWORDS,
"ASOF": TokenType.ASOF,
"GLOBAL": TokenType.GLOBAL,
"DATETIME64": TokenType.DATETIME,
"FINAL": TokenType.FINAL,
"FLOAT32": TokenType.FLOAT,
"FLOAT64": TokenType.DOUBLE,
"INT16": TokenType.SMALLINT,
"INT32": TokenType.INT,
"INT64": TokenType.BIGINT,
"INT8": TokenType.TINYINT,
"TUPLE": TokenType.STRUCT,
}
class Parser(parser.Parser):
FUNCTIONS = {
**parser.Parser.FUNCTIONS, # type: ignore
"MAP": parse_var_map,
"QUANTILE": lambda params, args: exp.Quantile(this=args, quantile=params),
"QUANTILES": lambda params, args: exp.Quantiles(parameters=params, expressions=args),
"QUANTILEIF": lambda params, args: exp.QuantileIf(parameters=params, expressions=args),
}
RANGE_PARSERS = {
**parser.Parser.RANGE_PARSERS,
TokenType.GLOBAL: lambda self, this: self._match(TokenType.IN)
and self._parse_in(this, is_global=True),
}
JOIN_KINDS = {*parser.Parser.JOIN_KINDS, TokenType.ANY, TokenType.ASOF} # type: ignore
TABLE_ALIAS_TOKENS = {*parser.Parser.TABLE_ALIAS_TOKENS} - {TokenType.ANY} # type: ignore
def _parse_in(
self, this: t.Optional[exp.Expression], is_global: bool = False
) -> exp.Expression:
this = super()._parse_in(this)
this.set("is_global", is_global)
return this
def _parse_table(
self, schema: bool = False, alias_tokens: t.Optional[t.Collection[TokenType]] = None
) -> t.Optional[exp.Expression]:
this = super()._parse_table(schema=schema, alias_tokens=alias_tokens)
if self._match(TokenType.FINAL):
this = self.expression(exp.Final, this=this)
return this
def _parse_position(self) -> exp.Expression:
this = super()._parse_position()
# clickhouse position args are swapped
substr = this.this
this.args["this"] = this.args.get("substr")
this.args["substr"] = substr
return this
# https://clickhouse.com/docs/en/sql-reference/statements/select/with/
def _parse_cte(self) -> exp.Expression:
index = self._index
try:
# WITH <identifier> AS <subquery expression>
return super()._parse_cte()
except ParseError:
# WITH <expression> AS <identifier>
self._retreat(index)
statement = self._parse_statement()
if statement and isinstance(statement.this, exp.Alias):
self.raise_error("Expected CTE to have alias")
return self.expression(exp.CTE, this=statement, alias=statement and statement.this)
class Generator(generator.Generator):
STRUCT_DELIMITER = ("(", ")")
TYPE_MAPPING = {
**generator.Generator.TYPE_MAPPING, # type: ignore
exp.DataType.Type.NULLABLE: "Nullable",
exp.DataType.Type.DATETIME: "DateTime64",
exp.DataType.Type.MAP: "Map",
exp.DataType.Type.ARRAY: "Array",
exp.DataType.Type.STRUCT: "Tuple",
exp.DataType.Type.TINYINT: "Int8",
exp.DataType.Type.SMALLINT: "Int16",
exp.DataType.Type.INT: "Int32",
exp.DataType.Type.BIGINT: "Int64",
exp.DataType.Type.FLOAT: "Float32",
exp.DataType.Type.DOUBLE: "Float64",
}
TRANSFORMS = {
**generator.Generator.TRANSFORMS, # type: ignore
exp.Array: inline_array_sql,
exp.StrPosition: lambda self, e: f"position({self.format_args(e.this, e.args.get('substr'), e.args.get('position'))})",
exp.Final: lambda self, e: f"{self.sql(e, 'this')} FINAL",
exp.Map: lambda self, e: _lower_func(var_map_sql(self, e)),
exp.VarMap: lambda self, e: _lower_func(var_map_sql(self, e)),
exp.Quantile: lambda self, e: f"quantile{self._param_args_sql(e, 'quantile', 'this')}",
exp.Quantiles: lambda self, e: f"quantiles{self._param_args_sql(e, 'parameters', 'expressions')}",
exp.QuantileIf: lambda self, e: f"quantileIf{self._param_args_sql(e, 'parameters', 'expressions')}",
}
EXPLICIT_UNION = True
def _param_args_sql(
self, expression: exp.Expression, params_name: str, args_name: str
) -> str:
params = self.format_args(self.expressions(expression, params_name))
args = self.format_args(self.expressions(expression, args_name))
return f"({params})({args})"
def cte_sql(self, expression: exp.CTE) -> str:
if isinstance(expression.this, exp.Alias):
return self.sql(expression, "this")
return super().cte_sql(expression)
|
