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52 lines
1.7 KiB
Python
52 lines
1.7 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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"""drop tables constraint
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Revision ID: 31b2a1039d4a
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Revises: ae1ed299413b
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Create Date: 2021-07-27 08:25:20.755453
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"""
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from alembic import op
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from sqlalchemy import engine
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from superset.utils.core import generic_find_uq_constraint_name
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# revision identifiers, used by Alembic.
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revision = "31b2a1039d4a"
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down_revision = "ae1ed299413b"
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conv = {"uq": "uq_%(table_name)s_%(column_0_name)s"}
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def upgrade():
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bind = op.get_bind()
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insp = engine.reflection.Inspector.from_engine(bind)
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# Drop the uniqueness constraint if it exists.
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if constraint := generic_find_uq_constraint_name("tables", {"table_name"}, insp):
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with op.batch_alter_table("tables", naming_convention=conv) as batch_op:
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batch_op.drop_constraint(constraint, type_="unique")
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def downgrade():
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# One cannot simply re-add the uniqueness constraint as it may not have previously
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# existed.
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pass
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