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from sqlglot import exp
from sqlglot.dialects.dialect import (
Dialect,
arrow_json_extract_scalar_sql,
arrow_json_extract_sql,
format_time_lambda,
no_paren_current_date_sql,
no_tablesample_sql,
no_trycast_sql,
)
from sqlglot.generator import Generator
from sqlglot.parser import Parser
from sqlglot.tokens import Tokenizer, TokenType
from sqlglot.transforms import delegate, preprocess
def _date_add_sql(kind):
def func(self, expression):
from sqlglot.optimizer.simplify import simplify
this = self.sql(expression, "this")
unit = self.sql(expression, "unit")
expression = simplify(expression.args["expression"])
if not isinstance(expression, exp.Literal):
self.unsupported("Cannot add non literal")
expression = expression.copy()
expression.args["is_string"] = True
expression = self.sql(expression)
return f"{this} {kind} INTERVAL {expression} {unit}"
return func
def _lateral_sql(self, expression):
this = self.sql(expression, "this")
if isinstance(expression.this, exp.Subquery):
return f"LATERAL{self.sep()}{this}"
alias = expression.args["alias"]
table = alias.name
table = f" {table}" if table else table
columns = self.expressions(alias, key="columns", flat=True)
columns = f" AS {columns}" if columns else ""
return f"LATERAL{self.sep()}{this}{table}{columns}"
def _substring_sql(self, expression):
this = self.sql(expression, "this")
start = self.sql(expression, "start")
length = self.sql(expression, "length")
from_part = f" FROM {start}" if start else ""
for_part = f" FOR {length}" if length else ""
return f"SUBSTRING({this}{from_part}{for_part})"
def _trim_sql(self, expression):
target = self.sql(expression, "this")
trim_type = self.sql(expression, "position")
remove_chars = self.sql(expression, "expression")
collation = self.sql(expression, "collation")
# Use TRIM/LTRIM/RTRIM syntax if the expression isn't postgres-specific
if not remove_chars and not collation:
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 ""
collation = f" COLLATE {collation}" if collation else ""
return f"TRIM({trim_type}{remove_chars}{from_part}{target}{collation})"
def _auto_increment_to_serial(expression):
auto = expression.find(exp.AutoIncrementColumnConstraint)
if auto:
expression = expression.copy()
expression.args["constraints"].remove(auto.parent)
kind = expression.args["kind"]
if kind.this == exp.DataType.Type.INT:
kind.replace(exp.DataType(this=exp.DataType.Type.SERIAL))
elif kind.this == exp.DataType.Type.SMALLINT:
kind.replace(exp.DataType(this=exp.DataType.Type.SMALLSERIAL))
elif kind.this == exp.DataType.Type.BIGINT:
kind.replace(exp.DataType(this=exp.DataType.Type.BIGSERIAL))
return expression
def _serial_to_generated(expression):
kind = expression.args["kind"]
if kind.this == exp.DataType.Type.SERIAL:
data_type = exp.DataType(this=exp.DataType.Type.INT)
elif kind.this == exp.DataType.Type.SMALLSERIAL:
data_type = exp.DataType(this=exp.DataType.Type.SMALLINT)
elif kind.this == exp.DataType.Type.BIGSERIAL:
data_type = exp.DataType(this=exp.DataType.Type.BIGINT)
else:
data_type = None
if data_type:
expression = expression.copy()
expression.args["kind"].replace(data_type)
constraints = expression.args["constraints"]
generated = exp.ColumnConstraint(kind=exp.GeneratedAsIdentityColumnConstraint(this=False))
notnull = exp.ColumnConstraint(kind=exp.NotNullColumnConstraint())
if notnull not in constraints:
constraints.insert(0, notnull)
if generated not in constraints:
constraints.insert(0, generated)
return expression
class Postgres(Dialect):
null_ordering = "nulls_are_large"
time_format = "'YYYY-MM-DD HH24:MI:SS'"
time_mapping = {
"AM": "%p",
"PM": "%p",
"D": "%w", # 1-based day of week
"DD": "%d", # day of month
"DDD": "%j", # zero padded day of year
"FMDD": "%-d", # - is no leading zero for Python; same for FM in postgres
"FMDDD": "%-j", # day of year
"FMHH12": "%-I", # 9
"FMHH24": "%-H", # 9
"FMMI": "%-M", # Minute
"FMMM": "%-m", # 1
"FMSS": "%-S", # Second
"HH12": "%I", # 09
"HH24": "%H", # 09
"MI": "%M", # zero padded minute
"MM": "%m", # 01
"OF": "%z", # utc offset
"SS": "%S", # zero padded second
"TMDay": "%A", # TM is locale dependent
"TMDy": "%a",
"TMMon": "%b", # Sep
"TMMonth": "%B", # September
"TZ": "%Z", # uppercase timezone name
"US": "%f", # zero padded microsecond
"WW": "%U", # 1-based week of year
"YY": "%y", # 15
"YYYY": "%Y", # 2015
}
class Tokenizer(Tokenizer):
BIT_STRINGS = [("b'", "'"), ("B'", "'")]
HEX_STRINGS = [("x'", "'"), ("X'", "'")]
KEYWORDS = {
**Tokenizer.KEYWORDS,
"ALWAYS": TokenType.ALWAYS,
"BY DEFAULT": TokenType.BY_DEFAULT,
"IDENTITY": TokenType.IDENTITY,
"FOR": TokenType.FOR,
"GENERATED": TokenType.GENERATED,
"DOUBLE PRECISION": TokenType.DOUBLE,
"BIGSERIAL": TokenType.BIGSERIAL,
"SERIAL": TokenType.SERIAL,
"SMALLSERIAL": TokenType.SMALLSERIAL,
"UUID": TokenType.UUID,
}
class Parser(Parser):
STRICT_CAST = False
FUNCTIONS = {
**Parser.FUNCTIONS,
"TO_TIMESTAMP": format_time_lambda(exp.StrToTime, "postgres"),
"TO_CHAR": format_time_lambda(exp.TimeToStr, "postgres"),
}
class Generator(Generator):
TYPE_MAPPING = {
**Generator.TYPE_MAPPING,
exp.DataType.Type.TINYINT: "SMALLINT",
exp.DataType.Type.FLOAT: "REAL",
exp.DataType.Type.DOUBLE: "DOUBLE PRECISION",
exp.DataType.Type.BINARY: "BYTEA",
exp.DataType.Type.DATETIME: "TIMESTAMP",
}
TRANSFORMS = {
**Generator.TRANSFORMS,
exp.ColumnDef: preprocess(
[
_auto_increment_to_serial,
_serial_to_generated,
],
delegate("columndef_sql"),
),
exp.JSONExtract: arrow_json_extract_sql,
exp.JSONExtractScalar: arrow_json_extract_scalar_sql,
exp.JSONBExtract: lambda self, e: f"{self.sql(e, 'this')}#>{self.sql(e, 'path')}",
exp.JSONBExtractScalar: lambda self, e: f"{self.sql(e, 'this')}#>>{self.sql(e, 'path')}",
exp.CurrentDate: no_paren_current_date_sql,
exp.CurrentTimestamp: lambda *_: "CURRENT_TIMESTAMP",
exp.DateAdd: _date_add_sql("+"),
exp.DateSub: _date_add_sql("-"),
exp.Lateral: _lateral_sql,
exp.StrToTime: lambda self, e: f"TO_TIMESTAMP({self.sql(e, 'this')}, {self.format_time(e)})",
exp.Substring: _substring_sql,
exp.TimeToStr: lambda self, e: f"TO_CHAR({self.sql(e, 'this')}, {self.format_time(e)})",
exp.TableSample: no_tablesample_sql,
exp.Trim: _trim_sql,
exp.TryCast: no_trycast_sql,
}
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