ClickHouse/tests/integration/test_distributed_over_distributed/test.py

# This test is a subset of the 01223_dist_on_dist.
# (just in case, with real separate instances).


import pytest
from helpers.cluster import ClickHouseCluster

cluster = ClickHouseCluster(__file__)

NODES = {
    "node"
    + str(i): cluster.add_instance(
        "node" + str(i),
        main_configs=["configs/remote_servers.xml"],
        user_configs=["configs/set_distributed_defaults.xml"],
    )
    for i in (1, 2)
}

CREATE_TABLES_SQL = """
CREATE TABLE
    base_table(
        node String,
        key Int32,
        value Int32
    )
ENGINE = Memory;

CREATE TABLE
    distributed_table
AS base_table
ENGINE = Distributed(test_cluster, default, base_table);

CREATE TABLE
    distributed_over_distributed_table
AS distributed_table
ENGINE = Distributed('test_cluster', default, distributed_table);
"""

INSERT_SQL_TEMPLATE = "INSERT INTO base_table VALUES ('{node_id}', {key}, {value})"


@pytest.fixture(scope="session")
def started_cluster():
    try:
        cluster.start()
        for node_index, (node_name, node) in enumerate(NODES.items()):
            node.query(CREATE_TABLES_SQL)
            for i in range(0, 2):
                node.query(
                    INSERT_SQL_TEMPLATE.format(
                        node_id=node_name, key=i, value=i + (node_index * 10)
                    )
                )
        yield cluster

    finally:
        cluster.shutdown()


@pytest.mark.parametrize(
    "node,source",
    [
        pytest.param(
            NODES["node1"], "distributed_over_distributed_table", id="dod_node1"
        ),
        pytest.param(
            NODES["node1"],
            "cluster('test_cluster', default, distributed_table)",
            id="cluster_node1",
        ),
        pytest.param(
            NODES["node2"], "distributed_over_distributed_table", id="dod_node2"
        ),
        pytest.param(
            NODES["node2"],
            "cluster('test_cluster', default, distributed_table)",
            id="cluster_node2",
        ),
    ],
)
class TestDistributedOverDistributedSuite:
    def test_select_with_order_by_node(self, started_cluster, node, source):
        assert (
            node.query(
                "SELECT * FROM {source} ORDER BY node, key".format(source=source)
            )
            == """node1	0	0
node1	0	0
node1	1	1
node1	1	1
node2	0	10
node2	0	10
node2	1	11
node2	1	11
"""
        )

    def test_select_with_order_by_key(self, started_cluster, node, source):
        assert (
            node.query(
                "SELECT * FROM {source} ORDER BY key, node".format(source=source)
            )
            == """node1	0	0
node1	0	0
node2	0	10
node2	0	10
node1	1	1
node1	1	1
node2	1	11
node2	1	11
"""
        )

    def test_select_with_group_by_node(self, started_cluster, node, source):
        assert (
            node.query(
                "SELECT node, SUM(value) FROM {source} GROUP BY node ORDER BY node".format(
                    source=source
                )
            )
            == "node1	2\nnode2	42\n"
        )

    def test_select_with_group_by_key(self, started_cluster, node, source):
        assert (
            node.query(
                "SELECT key, SUM(value) FROM {source} GROUP BY key ORDER BY key".format(
                    source=source
                )
            )
            == "0	20\n1	24\n"
        )

    def test_select_sum(self, started_cluster, node, source):
        assert (
            node.query("SELECT SUM(value) FROM {source}".format(source=source))
            == "44\n"
        )