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from __future__ import annotations
import re
from sqlglot import exp, generator, parser, tokens
from sqlglot.dialects.dialect import (
Dialect,
create_with_partitions_sql,
format_time_lambda,
no_pivot_sql,
no_trycast_sql,
rename_func,
str_position_sql,
)
from sqlglot.dialects.postgres import _lateral_sql
def _to_timestamp(args):
# TO_TIMESTAMP accepts either a single double argument or (text, text)
if len(args) == 1 and args[0].is_number:
return exp.UnixToTime.from_arg_list(args)
return format_time_lambda(exp.StrToTime, "drill")(args)
def _str_to_time_sql(self, expression):
return f"STRPTIME({self.sql(expression, 'this')}, {self.format_time(expression)})"
def _ts_or_ds_to_date_sql(self, expression):
time_format = self.format_time(expression)
if time_format and time_format not in (Drill.time_format, Drill.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_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
def if_sql(self, expression):
"""
Drill requires backticks around certain SQL reserved words, IF being one of them, This function
adds the backticks around the keyword IF.
Args:
self: The Drill dialect
expression: The input IF expression
Returns: The expression with IF in backticks.
"""
expressions = self.format_args(
expression.this, expression.args.get("true"), expression.args.get("false")
)
return f"`IF`({expressions})"
def _str_to_date(self, expression):
this = self.sql(expression, "this")
time_format = self.format_time(expression)
if time_format == Drill.date_format:
return f"CAST({this} AS DATE)"
return f"TO_DATE({this}, {time_format})"
class Drill(Dialect):
normalize_functions = None
null_ordering = "nulls_are_last"
date_format = "'yyyy-MM-dd'"
dateint_format = "'yyyyMMdd'"
time_format = "'yyyy-MM-dd HH:mm:ss'"
time_mapping = {
"y": "%Y",
"Y": "%Y",
"YYYY": "%Y",
"yyyy": "%Y",
"YY": "%y",
"yy": "%y",
"MMMM": "%B",
"MMM": "%b",
"MM": "%m",
"M": "%-m",
"dd": "%d",
"d": "%-d",
"HH": "%H",
"H": "%-H",
"hh": "%I",
"h": "%-I",
"mm": "%M",
"m": "%-M",
"ss": "%S",
"s": "%-S",
"SSSSSS": "%f",
"a": "%p",
"DD": "%j",
"D": "%-j",
"E": "%a",
"EE": "%a",
"EEE": "%a",
"EEEE": "%A",
"''T''": "T",
}
class Tokenizer(tokens.Tokenizer):
QUOTES = ["'"]
IDENTIFIERS = ["`"]
ESCAPES = ["\\"]
ENCODE = "utf-8"
class Parser(parser.Parser):
STRICT_CAST = False
FUNCTIONS = {
**parser.Parser.FUNCTIONS,
"TO_TIMESTAMP": exp.TimeStrToTime.from_arg_list,
"TO_CHAR": format_time_lambda(exp.TimeToStr, "drill"),
}
class Generator(generator.Generator):
TYPE_MAPPING = {
**generator.Generator.TYPE_MAPPING,
exp.DataType.Type.INT: "INTEGER",
exp.DataType.Type.SMALLINT: "INTEGER",
exp.DataType.Type.TINYINT: "INTEGER",
exp.DataType.Type.BINARY: "VARBINARY",
exp.DataType.Type.TEXT: "VARCHAR",
exp.DataType.Type.NCHAR: "VARCHAR",
exp.DataType.Type.TIMESTAMPLTZ: "TIMESTAMP",
exp.DataType.Type.TIMESTAMPTZ: "TIMESTAMP",
exp.DataType.Type.DATETIME: "TIMESTAMP",
}
ROOT_PROPERTIES = {exp.PartitionedByProperty}
TRANSFORMS = {
**generator.Generator.TRANSFORMS,
exp.CurrentTimestamp: lambda *_: "CURRENT_TIMESTAMP",
exp.Lateral: _lateral_sql,
exp.ArrayContains: rename_func("REPEATED_CONTAINS"),
exp.ArraySize: rename_func("REPEATED_COUNT"),
exp.Create: create_with_partitions_sql,
exp.DateAdd: _date_add_sql("ADD"),
exp.DateStrToDate: lambda self, e: f"CAST({self.sql(e, 'this')} AS DATE)",
exp.DateSub: _date_add_sql("SUB"),
exp.DateToDi: lambda self, e: f"CAST(TO_DATE({self.sql(e, 'this')}, {Drill.dateint_format}) AS INT)",
exp.DiToDate: lambda self, e: f"TO_DATE(CAST({self.sql(e, 'this')} AS VARCHAR), {Drill.dateint_format})",
exp.If: if_sql,
exp.ILike: lambda self, e: f" {self.sql(e, 'this')} `ILIKE` {self.sql(e, 'expression')}",
exp.Levenshtein: rename_func("LEVENSHTEIN_DISTANCE"),
exp.PartitionedByProperty: lambda self, e: f"PARTITION BY {self.sql(e, 'value')}",
exp.Pivot: no_pivot_sql,
exp.RegexpLike: rename_func("REGEXP_MATCHES"),
exp.StrPosition: str_position_sql,
exp.StrToDate: _str_to_date,
exp.StrToTime: lambda self, e: f"TO_TIMESTAMP({self.sql(e, 'this')}, {self.format_time(e)})",
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: rename_func("UNIX_TIMESTAMP"),
exp.TimeToStr: lambda self, e: f"TO_CHAR({self.sql(e, 'this')}, {self.format_time(e)})",
exp.TimeToUnix: rename_func("UNIX_TIMESTAMP"),
exp.TryCast: no_trycast_sql,
exp.TsOrDsAdd: lambda self, e: f"DATE_ADD(CAST({self.sql(e, 'this')} AS DATE), INTERVAL '{self.sql(e, 'expression')}' DAY)",
exp.TsOrDsToDate: _ts_or_ds_to_date_sql,
exp.TsOrDiToDi: lambda self, e: f"CAST(SUBSTR(REPLACE(CAST({self.sql(e, 'this')} AS VARCHAR), '-', ''), 1, 8) AS INT)",
}
def normalize_func(self, name):
return name if re.match(exp.SAFE_IDENTIFIER_RE, name) else f"`{name}`"
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