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import json
import unittest
from sqlglot import exp, parse_one
from sqlglot.optimizer.annotate_types import annotate_types
from tests.helpers import load_sql_fixtures
class CustomExpression(exp.Expression):
...
class TestSerDe(unittest.TestCase):
def dump_load(self, expression):
return exp.Expression.load(json.loads(json.dumps(expression.dump())))
def test_serde(self):
for sql in load_sql_fixtures("identity.sql"):
with self.subTest(sql):
before = parse_one(sql)
after = self.dump_load(before)
self.assertEqual(before, after)
def test_custom_expression(self):
before = CustomExpression()
after = self.dump_load(before)
self.assertEqual(before, after)
def test_type_annotations(self):
before = annotate_types(parse_one("CAST('1' AS INT)"))
after = self.dump_load(before)
self.assertEqual(before.type, after.type)
self.assertEqual(before.this.type, after.this.type)
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