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import unittest
from sqlglot import exp, parse_one
from sqlglot.expressions import Expression, Func
from sqlglot.parsers.snowflake import SnowflakeParser
import sqlglot.expressions.core as _core_module
_EXPRESSION_IS_COMPILED = getattr(_core_module, "__file__", "").endswith(".so")
class TestGenerator(unittest.TestCase):
@unittest.skipIf(_EXPRESSION_IS_COMPILED, "mypyc compiled expressions cannot be subclassed")
def test_fallback_function_sql(self):
class SpecialUdf(Expression, Func):
arg_types = {"a": True, "b": False}
SnowflakeParser.FUNCTIONS["SPECIAL_UDF"] = SpecialUdf.from_arg_list
try:
sql = "SELECT SPECIAL_UDF(a) FROM x"
expression = parse_one(sql, dialect="snowflake")
self.assertEqual(expression.sql(), "SELECT SPECIAL_UDF(a) FROM x")
finally:
del SnowflakeParser.FUNCTIONS["SPECIAL_UDF"]
@unittest.skipIf(_EXPRESSION_IS_COMPILED, "mypyc compiled expressions cannot be subclassed")
def test_fallback_function_var_args_sql(self):
class SpecialUdf(Expression, Func):
arg_types = {"a": True, "expressions": False}
is_var_len_args = True
SnowflakeParser.FUNCTIONS["SPECIAL_UDF"] = SpecialUdf.from_arg_list
try:
sql = "SELECT SPECIAL_UDF(a, b, c, d + 1) FROM x"
expression = parse_one(sql, dialect="snowflake")
self.assertEqual(expression.sql(), sql)
finally:
del SnowflakeParser.FUNCTIONS["SPECIAL_UDF"]
self.assertEqual(
exp.DateTrunc(this=exp.to_column("event_date"), unit=exp.var("MONTH")).sql(),
"DATE_TRUNC('MONTH', event_date)",
)
def test_identify(self):
self.assertEqual(parse_one("x").sql(identify=True), '"x"')
self.assertEqual(parse_one("x").sql(identify=False), "x")
self.assertEqual(parse_one("X").sql(identify=True), '"X"')
self.assertEqual(parse_one('"x"').sql(identify=False), '"x"')
self.assertEqual(parse_one("x").sql(identify="safe"), '"x"')
self.assertEqual(parse_one("X").sql(identify="safe"), "X")
self.assertEqual(parse_one("x as 1").sql(identify="safe"), '"x" AS "1"')
self.assertEqual(parse_one("X as 1").sql(identify="safe"), 'X AS "1"')
def test_generate_nested_binary(self):
sql = "SELECT 'foo'" + (" || 'foo'" * 1000)
self.assertEqual(parse_one(sql).sql(copy=False), sql)
def test_overlap_operator(self):
for op in ("&<", "&>"):
with self.subTest(op=op):
input_sql = f"SELECT '[1,10]'::int4range {op} '[5,15]'::int4range"
expected_sql = (
f"SELECT CAST('[1,10]' AS INT4RANGE) {op} CAST('[5,15]' AS INT4RANGE)"
)
ast = parse_one(input_sql, read="postgres")
self.assertEqual(ast.sql(), expected_sql)
self.assertEqual(ast.sql("postgres"), expected_sql)
def test_pretty_nested_types(self):
def assert_pretty_nested(
datatype: exp.DataType,
single_line: str,
pretty: str,
max_text_width: int = 10,
**kwargs,
) -> None:
self.assertEqual(datatype.sql(), single_line)
self.assertEqual(
datatype.sql(pretty=True, max_text_width=max_text_width, **kwargs), pretty
)
# STRUCT
type_str = "STRUCT<a INT, b TEXT>"
assert_pretty_nested(
exp.DataType.build(type_str),
type_str,
"STRUCT<\n a INT,\n b TEXT\n>",
)
# STRUCT - type def shorter than max text width so stays one line
assert_pretty_nested(
exp.DataType.build(type_str),
type_str,
"STRUCT<a INT, b TEXT>",
max_text_width=50,
)
# STRUCT, leading_comma = True
assert_pretty_nested(
exp.DataType.build(type_str),
type_str,
"STRUCT<\n a INT\n , b TEXT\n>",
leading_comma=True,
)
# ARRAY
type_str = "ARRAY<DECIMAL(38, 9)>"
assert_pretty_nested(
exp.DataType.build(type_str),
type_str,
"ARRAY<\n DECIMAL(38, 9)\n>",
)
# ARRAY nested STRUCT
type_str = "ARRAY<STRUCT<a INT, b TEXT>>"
assert_pretty_nested(
exp.DataType.build(type_str),
type_str,
"ARRAY<\n STRUCT<\n a INT,\n b TEXT\n >\n>",
)
# RANGE
type_str = "RANGE<DECIMAL(38, 9)>"
assert_pretty_nested(
exp.DataType.build(type_str),
type_str,
"RANGE<\n DECIMAL(38, 9)\n>",
)
# LIST
type_str = "LIST<INT, INT, TEXT>"
assert_pretty_nested(
exp.DataType.build(type_str),
type_str,
"LIST<\n INT,\n INT,\n TEXT\n>",
)
# MAP
type_str = "MAP<INT, DECIMAL(38, 9)>"
assert_pretty_nested(
exp.DataType.build(type_str),
type_str,
"MAP<\n INT,\n DECIMAL(38, 9)\n>",
)
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