ClickHouse/dbms/tests/integration/test_merge_table_over_distributed/test.py

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from contextlib import contextmanager
import pytest
from helpers.cluster import ClickHouseCluster
cluster = ClickHouseCluster(__file__)
node1 = cluster.add_instance('node1', main_configs=['configs/remote_servers.xml'])
node2 = cluster.add_instance('node2', main_configs=['configs/remote_servers.xml'])
@pytest.fixture(scope="module")
def started_cluster():
try:
cluster.start()
for node in (node1, node2):
node.query('''
CREATE TABLE local_table(id UInt32, val String) ENGINE = TinyLog;
CREATE TABLE local_table_2(id UInt32, val String) ENGINE = TinyLog;
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''')
node1.query("INSERT INTO local_table VALUES (1, 'node1')")
node2.query("INSERT INTO local_table VALUES (2, 'node2')")
node1.query('''
CREATE TABLE distributed_table(id UInt32, val String) ENGINE = Distributed(test_cluster, default, local_table);
CREATE TABLE distributed_table_2(id UInt32, val String) ENGINE = Distributed(test_cluster, default, local_table_2);
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CREATE TABLE merge_table(id UInt32, val String) ENGINE = Merge(default, '^distributed_table')
''')
yield cluster
finally:
cluster.shutdown()
def test_global_in(started_cluster):
assert node1.query("SELECT val FROM distributed_table WHERE id GLOBAL IN (SELECT toUInt32(3 - id) FROM local_table)").rstrip() \
== 'node2'
assert node1.query("SELECT val FROM merge_table WHERE id GLOBAL IN (SELECT toUInt32(3 - id) FROM local_table)").rstrip() \
== 'node2'
def test_filtering(started_cluster):
assert node1.query("SELECT id, val FROM merge_table WHERE id = 1").rstrip() == '1\tnode1'
assert node1.query("SELECT id + 1, val FROM merge_table WHERE id = 1").rstrip() == '2\tnode1'
assert node1.query("SELECT id + 1 FROM merge_table WHERE val = 'node1'").rstrip() == '2'
def test_select_table_name_from_merge_over_distributed(started_cluster):
node1.query("INSERT INTO local_table_2 VALUES (1, 'node1')")
node2.query("INSERT INTO local_table_2 VALUES (2, 'node2')")
node1.query("select _table == 'distributed_table' from merge_table")
node1.query("select * from (select _table == 'distributed_table' from merge_table limit 1)")
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if __name__ == '__main__':
with contextmanager(started_cluster)() as cluster:
for name, instance in cluster.instances.items():
print name, instance.ip_address
raw_input("Cluster created, press any key to destroy...")