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
|
from __future__ import annotations
from sqlglot import exp, generator, parser, tokens
from sqlglot.dialects.dialect import Dialect, inline_array_sql, var_map_sql
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,
"FINAL": TokenType.FINAL,
"DATETIME64": TokenType.DATETIME,
"INT8": TokenType.TINYINT,
"INT16": TokenType.SMALLINT,
"INT32": TokenType.INT,
"INT64": TokenType.BIGINT,
"FLOAT32": TokenType.FLOAT,
"FLOAT64": TokenType.DOUBLE,
"TUPLE": TokenType.STRUCT,
}
class Parser(parser.Parser):
FUNCTIONS = {
**parser.Parser.FUNCTIONS,
"MAP": parse_var_map,
}
def _parse_table(self, schema=False):
this = super()._parse_table(schema)
if self._match(TokenType.FINAL):
this = self.expression(exp.Final, this=this)
return this
class Generator(generator.Generator):
STRUCT_DELIMITER = ("(", ")")
TYPE_MAPPING = {
**generator.Generator.TYPE_MAPPING,
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,
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)),
}
EXPLICIT_UNION = True
|
