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from sqlglot import exp
from sqlglot.dialects.dialect import (
Dialect,
inline_array_sql,
no_ilike_sql,
rename_func,
)
from sqlglot.generator import Generator
from sqlglot.helper import list_get
from sqlglot.parser import Parser
from sqlglot.tokens import Tokenizer, TokenType
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=interval.args.get("unit"),
)
return func
def _date_add_sql(data_type, kind):
def func(self, expression):
this = self.sql(expression, "this")
unit = self.sql(expression, "unit") or "'day'"
expression = self.sql(expression, "expression")
return f"{data_type}_{kind}({this}, INTERVAL {expression} {unit})"
return func
def _subquery_to_unnest_if_values(self, expression):
if not isinstance(expression.this, exp.Values):
return self.subquery_sql(expression)
rows = [list(tuple_exp.find_all(exp.Literal)) for tuple_exp in expression.this.find_all(exp.Tuple)]
structs = []
for row in rows:
aliases = [
exp.alias_(value, column_name) for value, column_name in zip(row, expression.args["alias"].args["columns"])
]
structs.append(exp.Struct(expressions=aliases))
unnest_exp = exp.Unnest(expressions=[exp.Array(expressions=structs)])
return self.unnest_sql(unnest_exp)
def _returnsproperty_sql(self, expression):
value = expression.args.get("value")
if isinstance(value, exp.Schema):
value = f"{value.this} <{self.expressions(value)}>"
else:
value = self.sql(value)
return f"RETURNS {value}"
def _create_sql(self, expression):
kind = expression.args.get("kind")
returns = expression.find(exp.ReturnsProperty)
if kind.upper() == "FUNCTION" and returns and returns.args.get("is_table"):
expression = expression.copy()
expression.set("kind", "TABLE FUNCTION")
if isinstance(
expression.expression,
(
exp.Subquery,
exp.Literal,
),
):
expression.set("expression", expression.expression.this)
return self.create_sql(expression)
return self.create_sql(expression)
class BigQuery(Dialect):
unnest_column_only = True
class Tokenizer(Tokenizer):
QUOTES = [
(prefix + quote, quote) if prefix else quote
for quote in ["'", '"', '"""', "'''"]
for prefix in ["", "r", "R"]
]
IDENTIFIERS = ["`"]
ESCAPE = "\\"
HEX_STRINGS = [("0x", ""), ("0X", "")]
KEYWORDS = {
**Tokenizer.KEYWORDS,
"CURRENT_DATETIME": TokenType.CURRENT_DATETIME,
"CURRENT_TIME": TokenType.CURRENT_TIME,
"GEOGRAPHY": TokenType.GEOGRAPHY,
"INT64": TokenType.BIGINT,
"FLOAT64": TokenType.DOUBLE,
"QUALIFY": TokenType.QUALIFY,
"UNKNOWN": TokenType.NULL,
"WINDOW": TokenType.WINDOW,
}
class Parser(Parser):
FUNCTIONS = {
**Parser.FUNCTIONS,
"DATE_ADD": _date_add(exp.DateAdd),
"DATETIME_ADD": _date_add(exp.DatetimeAdd),
"TIME_ADD": _date_add(exp.TimeAdd),
"TIMESTAMP_ADD": _date_add(exp.TimestampAdd),
"DATE_SUB": _date_add(exp.DateSub),
"DATETIME_SUB": _date_add(exp.DatetimeSub),
"TIME_SUB": _date_add(exp.TimeSub),
"TIMESTAMP_SUB": _date_add(exp.TimestampSub),
}
NO_PAREN_FUNCTIONS = {
**Parser.NO_PAREN_FUNCTIONS,
TokenType.CURRENT_DATETIME: exp.CurrentDatetime,
TokenType.CURRENT_TIME: exp.CurrentTime,
}
NESTED_TYPE_TOKENS = {
*Parser.NESTED_TYPE_TOKENS,
TokenType.TABLE,
}
class Generator(Generator):
TRANSFORMS = {
**Generator.TRANSFORMS,
exp.Array: inline_array_sql,
exp.ArraySize: rename_func("ARRAY_LENGTH"),
exp.DateAdd: _date_add_sql("DATE", "ADD"),
exp.DateSub: _date_add_sql("DATE", "SUB"),
exp.DatetimeAdd: _date_add_sql("DATETIME", "ADD"),
exp.DatetimeSub: _date_add_sql("DATETIME", "SUB"),
exp.ILike: no_ilike_sql,
exp.TimeAdd: _date_add_sql("TIME", "ADD"),
exp.TimeSub: _date_add_sql("TIME", "SUB"),
exp.TimestampAdd: _date_add_sql("TIMESTAMP", "ADD"),
exp.TimestampSub: _date_add_sql("TIMESTAMP", "SUB"),
exp.VariancePop: rename_func("VAR_POP"),
exp.Subquery: _subquery_to_unnest_if_values,
exp.ReturnsProperty: _returnsproperty_sql,
exp.Create: _create_sql,
}
TYPE_MAPPING = {
**Generator.TYPE_MAPPING,
exp.DataType.Type.TINYINT: "INT64",
exp.DataType.Type.SMALLINT: "INT64",
exp.DataType.Type.INT: "INT64",
exp.DataType.Type.BIGINT: "INT64",
exp.DataType.Type.DECIMAL: "NUMERIC",
exp.DataType.Type.FLOAT: "FLOAT64",
exp.DataType.Type.DOUBLE: "FLOAT64",
exp.DataType.Type.BOOLEAN: "BOOL",
exp.DataType.Type.TEXT: "STRING",
exp.DataType.Type.VARCHAR: "STRING",
exp.DataType.Type.NVARCHAR: "STRING",
}
def in_unnest_op(self, unnest):
return self.sql(unnest)
def union_op(self, expression):
return f"UNION{' DISTINCT' if expression.args.get('distinct') else ' ALL'}"
def except_op(self, expression):
if not expression.args.get("distinct", False):
self.unsupported("EXCEPT without DISTINCT is not supported in BigQuery")
return f"EXCEPT{' DISTINCT' if expression.args.get('distinct') else ' ALL'}"
def intersect_op(self, expression):
if not expression.args.get("distinct", False):
self.unsupported("INTERSECT without DISTINCT is not supported in BigQuery")
return f"INTERSECT{' DISTINCT' if expression.args.get('distinct') else ' ALL'}"
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