ClickHouse/tests/integration/test_alter_update_cast_keep_nullable/test.py

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2021-08-07 08:11:40 +00:00
import pytest
from helpers.cluster import ClickHouseCluster
cluster = ClickHouseCluster(__file__)
node1 = cluster.add_instance('node1', user_configs=['configs/users.xml'], with_zookeeper=True)
@pytest.fixture(scope="module")
def started_cluster():
try:
cluster.start()
yield cluster
finally:
cluster.shutdown()
def test_cast_keep_nullable(started_cluster):
setting = node1.query("SELECT value FROM system.settings WHERE name='cast_keep_nullable'")
assert(setting.strip() == "1")
result = node1.query("""
DROP TABLE IF EXISTS t;
CREATE TABLE t (x UInt64) ENGINE = MergeTree ORDER BY tuple();
INSERT INTO t SELECT number FROM numbers(10);
SELECT * FROM t;
""")
assert(result.strip() == "0\n1\n2\n3\n4\n5\n6\n7\n8\n9")
error = node1.query_and_get_error("""
SET mutations_sync = 1;
ALTER TABLE t UPDATE x = x % 3 = 0 ? NULL : x WHERE x % 2 = 1; 
""")
assert("DB::Exception: Cannot convert NULL value to non-Nullable type" in error)
result = node1.query("SELECT * FROM t;")
assert(result.strip() == "0\n1\n2\n3\n4\n5\n6\n7\n8\n9")