fix: alembic migration fails by deleting non existent constraint on tables

superset/migrations/versions/18532d70ab98_fix_table_unique_constraint_in_mysql.py

@@ -1,42 +0,0 @@
-# Licensed to the Apache Software Foundation (ASF) under one
-# or more contributor license agreements.  See the NOTICE file
-# distributed with this work for additional information
-# regarding copyright ownership.  The ASF licenses this file
-# to you 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.
-"""Delete table_name unique constraint in mysql
-
-Revision ID: 18532d70ab98
-Revises: 3fbbc6e8d654
-Create Date: 2020-09-25 10:56:13.711182
-
-"""
-
-# revision identifiers, used by Alembic.
-revision = "18532d70ab98"
-down_revision = "3fbbc6e8d654"
-
-from alembic import op
-
-
-def upgrade():
-    try:
-        # index only exists in mysql db
-        with op.get_context().autocommit_block():
-            op.drop_constraint("table_name", "tables", type_="unique")
-    except Exception as ex:
-        print(ex)
-
-
-def downgrade():
-    pass