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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,
format_time_lambda,
no_pivot_sql,
no_properties_sql,
no_safe_divide_sql,
no_tablesample_sql,
rename_func,
str_position_sql,
)
from sqlglot.helper import seq_get
from sqlglot.tokens import TokenType
def _unix_to_time(self, expression):
return f"TO_TIMESTAMP(CAST({self.sql(expression, 'this')} AS BIGINT))"
def _str_to_time_sql(self, expression):
return f"STRPTIME({self.sql(expression, 'this')}, {self.format_time(expression)})"
def _ts_or_ds_add(self, expression):
this = self.sql(expression, "this")
e = self.sql(expression, "expression")
unit = self.sql(expression, "unit").strip("'") or "DAY"
return f"CAST({this} AS DATE) + INTERVAL {e} {unit}"
def _ts_or_ds_to_date_sql(self, expression):
time_format = self.format_time(expression)
if time_format and time_format not in (DuckDB.time_format, DuckDB.date_format):
return f"CAST({_str_to_time_sql(self, expression)} AS DATE)"
return f"CAST({self.sql(expression, 'this')} AS DATE)"
def _date_add(self, expression):
this = self.sql(expression, "this")
e = self.sql(expression, "expression")
unit = self.sql(expression, "unit").strip("'") or "DAY"
return f"{this} + INTERVAL {e} {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_pack_sql(self, expression):
args = [
self.binary(e, ":=") if isinstance(e, exp.EQ) else self.sql(e)
for e in expression.expressions
]
return f"STRUCT_PACK({', '.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)
class DuckDB(Dialect):
class Tokenizer(tokens.Tokenizer):
KEYWORDS = {
**tokens.Tokenizer.KEYWORDS,
":=": TokenType.EQ,
}
class Parser(parser.Parser):
FUNCTIONS = {
**parser.Parser.FUNCTIONS,
"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.TimeStrToTime.from_arg_list,
"UNNEST": exp.Explode.from_arg_list,
}
class Generator(generator.Generator):
STRUCT_DELIMITER = ("(", ")")
TRANSFORMS = {
**generator.Generator.TRANSFORMS,
exp.ApproxDistinct: approx_count_distinct_sql,
exp.Array: rename_func("LIST_VALUE"),
exp.ArraySize: rename_func("ARRAY_LENGTH"),
exp.ArraySort: _array_sort_sql,
exp.ArraySum: rename_func("LIST_SUM"),
exp.DataType: _datatype_sql,
exp.DateAdd: _date_add,
exp.DateDiff: lambda self, e: f"""DATE_DIFF({self.format_args(e.args.get("unit") or "'day'", e.expression, e.this)})""",
exp.DateStrToDate: lambda self, e: f"CAST({self.sql(e, 'this')} AS DATE)",
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.Pivot: no_pivot_sql,
exp.Properties: no_properties_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_pack_sql,
exp.TableSample: no_tablesample_sql,
exp.TimeStrToDate: lambda self, e: f"CAST({self.sql(e, 'this')} AS DATE)",
exp.TimeStrToTime: lambda self, e: f"CAST({self.sql(e, 'this')} AS TIMESTAMP)",
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,
exp.UnixToStr: lambda self, e: f"STRFTIME({_unix_to_time(self, e)}, {self.format_time(e)})",
exp.UnixToTime: _unix_to_time,
exp.UnixToTimeStr: lambda self, e: f"CAST({_unix_to_time(self, e)} AS TEXT)",
}
TYPE_MAPPING = {
**generator.Generator.TYPE_MAPPING,
exp.DataType.Type.VARCHAR: "TEXT",
exp.DataType.Type.NVARCHAR: "TEXT",
}
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