45 lines
1.4 KiB
Python
45 lines
1.4 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from oslo_log import log as logging
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from sqlalchemy import MetaData, Table, Index
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LOG = logging.getLogger(__name__)
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INDEX_COLUMNS = ['value']
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INDEX_NAME = 'aggregate_metadata_value_idx'
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TABLE_NAME = 'aggregate_metadata'
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def _get_table_index(migrate_engine):
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meta = MetaData()
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meta.bind = migrate_engine
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table = Table(TABLE_NAME, meta, autoload=True)
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for idx in table.indexes:
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if idx.columns.keys() == INDEX_COLUMNS:
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break
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else:
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idx = None
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return table, idx
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def upgrade(migrate_engine):
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table, index = _get_table_index(migrate_engine)
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if index:
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LOG.info('Skipped adding %s because an equivalent index'
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' already exists.', INDEX_NAME)
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return
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columns = [getattr(table.c, col_name) for col_name in INDEX_COLUMNS]
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index = Index(INDEX_NAME, *columns)
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index.create(migrate_engine)
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