Cover tmp_policy

dbms/tests/integration/test_tmp_policy/configs/config.d/storage_configuration.xml

@@ -0,0 +1,25 @@
+<yandex>
+    <storage_configuration>
+        <disks>
+            <disk1>
+                <path>/disk1/</path>
+            </disk1>
+            <disk2>
+                <path>/disk2/</path>
+            </disk2>
+        </disks>
+
+        <policies>
+            <tmp>
+                <volumes>
+                    <main>
+                        <disk>disk1</disk>
+                        <disk>disk2</disk>
+                    </main>
+                </volumes>
+            </tmp>
+        </policies>
+    </storage_configuration>
+
+    <tmp_policy>tmp</tmp_policy>
+</yandex>

dbms/tests/integration/test_tmp_policy/test.py

@@ -0,0 +1,34 @@
+# pylint: disable=unused-argument
+# pylint: disable=redefined-outer-name
+
+import pytest
+
+from helpers.cluster import ClickHouseCluster
+
+cluster = ClickHouseCluster(__file__)
+
+node = cluster.add_instance('node',
+            config_dir='configs',
+            tmpfs=['/disk1:size=100M', '/disk2:size=100M'])
+
+@pytest.fixture(scope='module')
+def start_cluster():
+    try:
+        cluster.start()
+        yield cluster
+    finally:
+        cluster.shutdown()
+
+def test_different_versions(start_cluster):
+    query = 'SELECT count(ignore(*)) FROM (SELECT * FROM system.numbers LIMIT 1e7) GROUP BY number'
+    settings = {
+        'max_bytes_before_external_group_by': 1<<20,
+        'max_bytes_before_external_sort':     1<<20,
+    }
+
+    assert node.contains_in_log('Setting up /disk1/ to store temporary data in it')
+    assert node.contains_in_log('Setting up /disk2/ to store temporary data in it')
+
+    node.query(query, settings=settings)
+    assert node.contains_in_log('Writing part of aggregation data into temporary file /disk1/')
+    assert node.contains_in_log('Writing part of aggregation data into temporary file /disk2/')