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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
from sqlglot import exp
from sqlglot.dialects.dialect import (
Dialect,
no_ilike_sql,
no_paren_current_date_sql,
no_tablesample_sql,
no_trycast_sql,
)
from sqlglot.generator import Generator
from sqlglot.helper import list_get
from sqlglot.parser import Parser
from sqlglot.tokens import Tokenizer, TokenType
def _date_trunc_sql(self, expression):
unit = expression.text("unit").lower()
this = self.sql(expression.this)
if unit == "day":
return f"DATE({this})"
if unit == "week":
concat = f"CONCAT(YEAR({this}), ' ', WEEK({this}, 1), ' 1')"
date_format = "%Y %u %w"
elif unit == "month":
concat = f"CONCAT(YEAR({this}), ' ', MONTH({this}), ' 1')"
date_format = "%Y %c %e"
elif unit == "quarter":
concat = f"CONCAT(YEAR({this}), ' ', QUARTER({this}) * 3 - 2, ' 1')"
date_format = "%Y %c %e"
elif unit == "year":
concat = f"CONCAT(YEAR({this}), ' 1 1')"
date_format = "%Y %c %e"
else:
self.unsupported("Unexpected interval unit: {unit}")
return f"DATE({this})"
return f"STR_TO_DATE({concat}, '{date_format}')"
def _str_to_date(args):
date_format = MySQL.format_time(list_get(args, 1))
return exp.StrToDate(this=list_get(args, 0), format=date_format)
def _str_to_date_sql(self, expression):
date_format = self.format_time(expression)
return f"STR_TO_DATE({self.sql(expression.this)}, {date_format})"
def _trim_sql(self, expression):
target = self.sql(expression, "this")
trim_type = self.sql(expression, "position")
remove_chars = self.sql(expression, "expression")
# Use TRIM/LTRIM/RTRIM syntax if the expression isn't mysql-specific
if not remove_chars:
return self.trim_sql(expression)
trim_type = f"{trim_type} " if trim_type else ""
remove_chars = f"{remove_chars} " if remove_chars else ""
from_part = "FROM " if trim_type or remove_chars else ""
return f"TRIM({trim_type}{remove_chars}{from_part}{target})"
def _date_add(expression_class):
def func(args):
interval = list_get(args, 1)
return expression_class(
this=list_get(args, 0),
expression=interval.this,
unit=exp.Literal.string(interval.text("unit").lower()),
)
return func
def _date_add_sql(kind):
def func(self, expression):
this = self.sql(expression, "this")
unit = expression.text("unit").upper() or "DAY"
expression = self.sql(expression, "expression")
return f"DATE_{kind}({this}, INTERVAL {expression} {unit})"
return func
class MySQL(Dialect):
# https://prestodb.io/docs/current/functions/datetime.html#mysql-date-functions
time_mapping = {
"%M": "%B",
"%c": "%-m",
"%e": "%-d",
"%h": "%I",
"%i": "%M",
"%s": "%S",
"%S": "%S",
"%u": "%W",
}
class Tokenizer(Tokenizer):
QUOTES = ["'", '"']
COMMENTS = ["--", "#", ("/*", "*/")]
IDENTIFIERS = ["`"]
BIT_STRINGS = [("b'", "'"), ("B'", "'"), ("0b", "")]
HEX_STRINGS = [("x'", "'"), ("X'", "'"), ("0x", "")]
KEYWORDS = {
**Tokenizer.KEYWORDS,
"SEPARATOR": TokenType.SEPARATOR,
"_ARMSCII8": TokenType.INTRODUCER,
"_ASCII": TokenType.INTRODUCER,
"_BIG5": TokenType.INTRODUCER,
"_BINARY": TokenType.INTRODUCER,
"_CP1250": TokenType.INTRODUCER,
"_CP1251": TokenType.INTRODUCER,
"_CP1256": TokenType.INTRODUCER,
"_CP1257": TokenType.INTRODUCER,
"_CP850": TokenType.INTRODUCER,
"_CP852": TokenType.INTRODUCER,
"_CP866": TokenType.INTRODUCER,
"_CP932": TokenType.INTRODUCER,
"_DEC8": TokenType.INTRODUCER,
"_EUCJPMS": TokenType.INTRODUCER,
"_EUCKR": TokenType.INTRODUCER,
"_GB18030": TokenType.INTRODUCER,
"_GB2312": TokenType.INTRODUCER,
"_GBK": TokenType.INTRODUCER,
"_GEOSTD8": TokenType.INTRODUCER,
"_GREEK": TokenType.INTRODUCER,
"_HEBREW": TokenType.INTRODUCER,
"_HP8": TokenType.INTRODUCER,
"_KEYBCS2": TokenType.INTRODUCER,
"_KOI8R": TokenType.INTRODUCER,
"_KOI8U": TokenType.INTRODUCER,
"_LATIN1": TokenType.INTRODUCER,
"_LATIN2": TokenType.INTRODUCER,
"_LATIN5": TokenType.INTRODUCER,
"_LATIN7": TokenType.INTRODUCER,
"_MACCE": TokenType.INTRODUCER,
"_MACROMAN": TokenType.INTRODUCER,
"_SJIS": TokenType.INTRODUCER,
"_SWE7": TokenType.INTRODUCER,
"_TIS620": TokenType.INTRODUCER,
"_UCS2": TokenType.INTRODUCER,
"_UJIS": TokenType.INTRODUCER,
"_UTF8": TokenType.INTRODUCER,
"_UTF16": TokenType.INTRODUCER,
"_UTF16LE": TokenType.INTRODUCER,
"_UTF32": TokenType.INTRODUCER,
"_UTF8MB3": TokenType.INTRODUCER,
"_UTF8MB4": TokenType.INTRODUCER,
}
class Parser(Parser):
STRICT_CAST = False
FUNCTIONS = {
**Parser.FUNCTIONS,
"DATE_ADD": _date_add(exp.DateAdd),
"DATE_SUB": _date_add(exp.DateSub),
"STR_TO_DATE": _str_to_date,
}
FUNCTION_PARSERS = {
**Parser.FUNCTION_PARSERS,
"GROUP_CONCAT": lambda self: self.expression(
exp.GroupConcat,
this=self._parse_lambda(),
separator=self._match(TokenType.SEPARATOR) and self._parse_field(),
),
}
class Generator(Generator):
NULL_ORDERING_SUPPORTED = False
TRANSFORMS = {
**Generator.TRANSFORMS,
exp.CurrentDate: no_paren_current_date_sql,
exp.CurrentTimestamp: lambda *_: "CURRENT_TIMESTAMP",
exp.ILike: no_ilike_sql,
exp.TableSample: no_tablesample_sql,
exp.TryCast: no_trycast_sql,
exp.DateAdd: _date_add_sql("ADD"),
exp.DateSub: _date_add_sql("SUB"),
exp.DateTrunc: _date_trunc_sql,
exp.GroupConcat: lambda self, e: f"""GROUP_CONCAT({self.sql(e, "this")} SEPARATOR {self.sql(e, "separator") or "','"})""",
exp.StrToDate: _str_to_date_sql,
exp.StrToTime: _str_to_date_sql,
exp.Trim: _trim_sql,
}
|
