diff --git a/tests/integration/test_ttl_move/test.py b/tests/integration/test_ttl_move/test.py
index a4318df1658..26bd36b8cb6 100644
--- a/tests/integration/test_ttl_move/test.py
+++ b/tests/integration/test_ttl_move/test.py
@@ -61,7 +61,7 @@ def get_used_disks_for_table(node, table_name, partition=None):
 def check_used_disks_with_retry(node, table_name, expected_disks, retries):
     for _ in range(retries):
         used_disks = get_used_disks_for_table(node, table_name)
-        if set(used_disks) == expected_disks:
+        if set(used_disks).issubset(expected_disks):
             return True
         time.sleep(0.5)
     return False
@@ -830,7 +830,8 @@ def test_concurrent_alter_with_ttl_move(started_cluster, name, engine):
         def optimize_table(num):
             for i in range(num):
                 try: # optimize may throw after concurrent alter
-                    node1.query("OPTIMIZE TABLE {} FINAL".format(name))
+                    node1.query("OPTIMIZE TABLE {} FINAL".format(name), settings={'optimize_throw_if_noop': '1'})
+                    break
                 except:
                     pass
 
@@ -903,3 +904,93 @@ def test_double_move_while_select(started_cluster, name, positive):
 
     finally:
         node1.query("DROP TABLE IF EXISTS {name}".format(name=name))
+
+
+@pytest.mark.parametrize("name,engine,positive", [
+    ("mt_test_alter_with_merge_do_not_work","MergeTree()",0),
+    ("replicated_mt_test_alter_with_merge_do_not_work","ReplicatedMergeTree('/clickhouse/replicated_test_alter_with_merge_do_not_work', '1')",0),
+    ("mt_test_alter_with_merge_work","MergeTree()",1),
+    ("replicated_mt_test_alter_with_merge_work","ReplicatedMergeTree('/clickhouse/replicated_test_alter_with_merge_work', '1')",1),
+])
+def test_alter_with_merge_work(started_cluster, name, engine, positive):
+    """Copyright 2019, Altinity LTD
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License."""
+    """Check that TTL expressions are re-evaluated for
+    existing parts after ALTER command changes TTL expressions
+    and parts are merged.
+    """
+    try:
+        node1.query("""
+            CREATE TABLE {name} (
+                s1 String,
+                d1 DateTime
+            ) ENGINE = {engine}
+            ORDER BY tuple()
+            TTL d1 + INTERVAL 3000 SECOND TO DISK 'jbod2',
+                d1 + INTERVAL 6000 SECOND TO VOLUME 'external'
+            SETTINGS storage_policy='jbods_with_external', merge_with_ttl_timeout=0
+        """.format(name=name, engine=engine))
+
+
+        def optimize_table(num):
+            for i in range(num):
+                try: # optimize may throw after concurrent alter
+                    node1.query("OPTIMIZE TABLE {} FINAL".format(name), settings={'optimize_throw_if_noop': '1'})
+                    break
+                except:
+                    pass
+
+        for p in range(3):
+            data = [] # 6MB in total
+            now = time.time()
+            for i in range(2):
+                s1 = get_random_string(1024 * 1024) # 1MB
+                d1 = now - 1 if positive else now + 300
+                data.append("('{}', toDateTime({}))".format(s1, d1))
+            values = ",".join(data)
+            node1.query("INSERT INTO {name} (s1, d1) VALUES {values}".format(name=name, values=values))
+
+        used_disks = get_used_disks_for_table(node1, name)
+        assert set(used_disks) == {"jbod1", "jbod2"}
+
+        node1.query("SELECT count() FROM {name}".format(name=name)).splitlines() == ["6"]
+
+        node1.query("""
+            ALTER TABLE {name} MODIFY
+            TTL d1 + INTERVAL 0 SECOND TO DISK 'jbod2',
+                d1 + INTERVAL 5 SECOND TO VOLUME 'external',
+                d1 + INTERVAL 10 SECOND DELETE
+        """.format(name=name))
+
+        optimize_table(20)
+
+        assert node1.query("SELECT count() FROM system.parts WHERE table = '{name}' AND active = 1".format(name=name)) == "1\n"
+
+        time.sleep(5)
+
+        optimize_table(20)
+
+        if positive:
+            assert check_used_disks_with_retry(node1, name, set(["external"]), 50)
+        else:
+            assert check_used_disks_with_retry(node1, name, set(["jbod1", "jbod2"]), 50)
+
+        time.sleep(5)
+
+        optimize_table(20)
+
+        if positive:
+            assert node1.query("SELECT count() FROM {name}".format(name=name)) == "0\n"
+        else:
+            assert node1.query("SELECT count() FROM {name}".format(name=name)) == "6\n"
+
+    finally:
+        node1.query("DROP TABLE IF EXISTS {name}".format(name=name))