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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
from __future__ import annotations
from sqlglot import exp, generator, parser, tokens
from sqlglot.dialects.dialect import (
Dialect,
approx_count_distinct_sql,
arrow_json_extract_scalar_sql,
arrow_json_extract_sql,
datestrtodate_sql,
format_time_lambda,
no_pivot_sql,
no_properties_sql,
no_safe_divide_sql,
rename_func,
str_position_sql,
str_to_time_sql,
timestamptrunc_sql,
timestrtotime_sql,
ts_or_ds_to_date_sql,
)
from sqlglot.helper import seq_get
from sqlglot.tokens import TokenType
def _ts_or_ds_add(self, expression):
this = expression.args.get("this")
unit = self.sql(expression, "unit").strip("'") or "DAY"
return f"CAST({this} AS DATE) + {self.sql(exp.Interval(this=expression.expression, unit=unit))}"
def _date_add(self, expression):
this = self.sql(expression, "this")
unit = self.sql(expression, "unit").strip("'") or "DAY"
return f"{this} + {self.sql(exp.Interval(this=expression.expression, unit=unit))}"
def _array_sort_sql(self, expression):
if expression.expression:
self.unsupported("DUCKDB ARRAY_SORT does not support a comparator")
return f"ARRAY_SORT({self.sql(expression, 'this')})"
def _sort_array_sql(self, expression):
this = self.sql(expression, "this")
if expression.args.get("asc") == exp.false():
return f"ARRAY_REVERSE_SORT({this})"
return f"ARRAY_SORT({this})"
def _sort_array_reverse(args):
return exp.SortArray(this=seq_get(args, 0), asc=exp.false())
def _struct_sql(self, expression):
args = [
f"'{e.name or e.this.name}': {self.sql(e, 'expression')}" for e in expression.expressions
]
return f"{{{', '.join(args)}}}"
def _datatype_sql(self, expression):
if expression.this == exp.DataType.Type.ARRAY:
return f"{self.expressions(expression, flat=True)}[]"
return self.datatype_sql(expression)
def _regexp_extract_sql(self, expression):
bad_args = list(filter(expression.args.get, ("position", "occurrence")))
if bad_args:
self.unsupported(f"REGEXP_EXTRACT does not support arg(s) {bad_args}")
return self.func(
"REGEXP_EXTRACT",
expression.args.get("this"),
expression.args.get("expression"),
expression.args.get("group"),
)
class DuckDB(Dialect):
class Tokenizer(tokens.Tokenizer):
KEYWORDS = {
**tokens.Tokenizer.KEYWORDS,
"~": TokenType.RLIKE,
":=": TokenType.EQ,
"ATTACH": TokenType.COMMAND,
"BINARY": TokenType.VARBINARY,
"BPCHAR": TokenType.TEXT,
"BITSTRING": TokenType.BIT,
"CHAR": TokenType.TEXT,
"CHARACTER VARYING": TokenType.TEXT,
"EXCLUDE": TokenType.EXCEPT,
"INT1": TokenType.TINYINT,
"LOGICAL": TokenType.BOOLEAN,
"NUMERIC": TokenType.DOUBLE,
"SIGNED": TokenType.INT,
"STRING": TokenType.VARCHAR,
"UBIGINT": TokenType.UBIGINT,
"UINTEGER": TokenType.UINT,
"USMALLINT": TokenType.USMALLINT,
"UTINYINT": TokenType.UTINYINT,
}
class Parser(parser.Parser):
FUNCTIONS = {
**parser.Parser.FUNCTIONS, # type: ignore
"APPROX_COUNT_DISTINCT": exp.ApproxDistinct.from_arg_list,
"ARRAY_LENGTH": exp.ArraySize.from_arg_list,
"ARRAY_SORT": exp.SortArray.from_arg_list,
"ARRAY_REVERSE_SORT": _sort_array_reverse,
"EPOCH": exp.TimeToUnix.from_arg_list,
"EPOCH_MS": lambda args: exp.UnixToTime(
this=exp.Div(
this=seq_get(args, 0),
expression=exp.Literal.number(1000),
)
),
"LIST_SORT": exp.SortArray.from_arg_list,
"LIST_REVERSE_SORT": _sort_array_reverse,
"LIST_VALUE": exp.Array.from_arg_list,
"REGEXP_MATCHES": exp.RegexpLike.from_arg_list,
"STRFTIME": format_time_lambda(exp.TimeToStr, "duckdb"),
"STRPTIME": format_time_lambda(exp.StrToTime, "duckdb"),
"STR_SPLIT": exp.Split.from_arg_list,
"STRING_SPLIT": exp.Split.from_arg_list,
"STRING_TO_ARRAY": exp.Split.from_arg_list,
"STR_SPLIT_REGEX": exp.RegexpSplit.from_arg_list,
"STRING_SPLIT_REGEX": exp.RegexpSplit.from_arg_list,
"STRUCT_PACK": exp.Struct.from_arg_list,
"TO_TIMESTAMP": exp.UnixToTime.from_arg_list,
"UNNEST": exp.Explode.from_arg_list,
}
TYPE_TOKENS = {
*parser.Parser.TYPE_TOKENS,
TokenType.UBIGINT,
TokenType.UINT,
TokenType.USMALLINT,
TokenType.UTINYINT,
}
class Generator(generator.Generator):
STRUCT_DELIMITER = ("(", ")")
TRANSFORMS = {
**generator.Generator.TRANSFORMS, # type: ignore
exp.ApproxDistinct: approx_count_distinct_sql,
exp.Array: lambda self, e: self.func("ARRAY", e.expressions[0])
if isinstance(seq_get(e.expressions, 0), exp.Select)
else rename_func("LIST_VALUE")(self, e),
exp.ArraySize: rename_func("ARRAY_LENGTH"),
exp.ArraySort: _array_sort_sql,
exp.ArraySum: rename_func("LIST_SUM"),
exp.DayOfMonth: rename_func("DAYOFMONTH"),
exp.DayOfWeek: rename_func("DAYOFWEEK"),
exp.DayOfYear: rename_func("DAYOFYEAR"),
exp.DataType: _datatype_sql,
exp.DateAdd: _date_add,
exp.DateDiff: lambda self, e: self.func(
"DATE_DIFF", e.args.get("unit") or exp.Literal.string("day"), e.expression, e.this
),
exp.DateStrToDate: datestrtodate_sql,
exp.DateToDi: lambda self, e: f"CAST(STRFTIME({self.sql(e, 'this')}, {DuckDB.dateint_format}) AS INT)",
exp.DiToDate: lambda self, e: f"CAST(STRPTIME(CAST({self.sql(e, 'this')} AS TEXT), {DuckDB.dateint_format}) AS DATE)",
exp.Explode: rename_func("UNNEST"),
exp.JSONExtract: arrow_json_extract_sql,
exp.JSONExtractScalar: arrow_json_extract_scalar_sql,
exp.JSONBExtract: arrow_json_extract_sql,
exp.JSONBExtractScalar: arrow_json_extract_scalar_sql,
exp.LogicalOr: rename_func("BOOL_OR"),
exp.LogicalAnd: rename_func("BOOL_AND"),
exp.Pivot: no_pivot_sql,
exp.Properties: no_properties_sql,
exp.RegexpExtract: _regexp_extract_sql,
exp.RegexpLike: rename_func("REGEXP_MATCHES"),
exp.RegexpSplit: rename_func("STR_SPLIT_REGEX"),
exp.SafeDivide: no_safe_divide_sql,
exp.Split: rename_func("STR_SPLIT"),
exp.SortArray: _sort_array_sql,
exp.StrPosition: str_position_sql,
exp.StrToDate: lambda self, e: f"CAST({str_to_time_sql(self, e)} AS DATE)",
exp.StrToTime: str_to_time_sql,
exp.StrToUnix: lambda self, e: f"EPOCH(STRPTIME({self.sql(e, 'this')}, {self.format_time(e)}))",
exp.Struct: _struct_sql,
exp.TimestampTrunc: timestamptrunc_sql,
exp.TimeStrToDate: lambda self, e: f"CAST({self.sql(e, 'this')} AS DATE)",
exp.TimeStrToTime: timestrtotime_sql,
exp.TimeStrToUnix: lambda self, e: f"EPOCH(CAST({self.sql(e, 'this')} AS TIMESTAMP))",
exp.TimeToStr: lambda self, e: f"STRFTIME({self.sql(e, 'this')}, {self.format_time(e)})",
exp.TimeToUnix: rename_func("EPOCH"),
exp.TsOrDiToDi: lambda self, e: f"CAST(SUBSTR(REPLACE(CAST({self.sql(e, 'this')} AS TEXT), '-', ''), 1, 8) AS INT)",
exp.TsOrDsAdd: _ts_or_ds_add,
exp.TsOrDsToDate: ts_or_ds_to_date_sql("duckdb"),
exp.UnixToStr: lambda self, e: f"STRFTIME(TO_TIMESTAMP({self.sql(e, 'this')}), {self.format_time(e)})",
exp.UnixToTime: rename_func("TO_TIMESTAMP"),
exp.UnixToTimeStr: lambda self, e: f"CAST(TO_TIMESTAMP({self.sql(e, 'this')}) AS TEXT)",
exp.WeekOfYear: rename_func("WEEKOFYEAR"),
}
TYPE_MAPPING = {
**generator.Generator.TYPE_MAPPING, # type: ignore
exp.DataType.Type.BINARY: "BLOB",
exp.DataType.Type.CHAR: "TEXT",
exp.DataType.Type.FLOAT: "REAL",
exp.DataType.Type.NCHAR: "TEXT",
exp.DataType.Type.NVARCHAR: "TEXT",
exp.DataType.Type.UINT: "UINTEGER",
exp.DataType.Type.VARBINARY: "BLOB",
exp.DataType.Type.VARCHAR: "TEXT",
}
STAR_MAPPING = {
**generator.Generator.STAR_MAPPING,
"except": "EXCLUDE",
}
LIMIT_FETCH = "LIMIT"
def tablesample_sql(self, expression: exp.TableSample, seed_prefix: str = "SEED") -> str:
return super().tablesample_sql(expression, seed_prefix="REPEATABLE")
|
