/usr/lib/python3/dist-packages/gnocchi/indexer/alembic/versions/a54c57ada3f5_removes_useless_indexes.py is in python3-gnocchi 4.2.0-0ubuntu5.
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#
# 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.
#
"""merges primarykey and indexes
Revision ID: a54c57ada3f5
Revises: 1c2c61ac1f4c
Create Date: 2016-02-04 09:09:23.180955
"""
from alembic import op
# revision identifiers, used by Alembic.
revision = 'a54c57ada3f5'
down_revision = '1c2c61ac1f4c'
branch_labels = None
depends_on = None
resource_tables = [(t, "id") for t in [
"instance",
"instance_disk",
"instance_net_int",
"swift_account",
"volume",
"ceph_account",
"network",
"identity",
"ipmi",
"stack",
"image"
]]
history_tables = [("%s_history" % t, "revision")
for t, c in resource_tables]
other_tables = [("metric", "id"), ("archive_policy", "name"),
("archive_policy_rule", "name"),
("resource", "id"),
("resource_history", "id")]
def upgrade():
bind = op.get_bind()
# NOTE(sileht): mysql can't delete an index on a foreign key
# even this one is not the index used by the foreign key itself...
# In our case we have two indexes fk_resource_history_id_resource_id and
# and ix_resource_history_id, we want to delete only the second, but mysql
# can't do that with a simple DROP INDEX ix_resource_history_id...
# so we have to remove the constraint and put it back...
if bind.engine.name == "mysql":
op.drop_constraint("fk_resource_history_id_resource_id",
type_="foreignkey", table_name="resource_history")
for table, colname in resource_tables + history_tables + other_tables:
op.drop_index("ix_%s_%s" % (table, colname), table_name=table)
if bind.engine.name == "mysql":
op.create_foreign_key("fk_resource_history_id_resource_id",
"resource_history", "resource", ["id"], ["id"],
ondelete="CASCADE")
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