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# frozen_string_literal: true
class PrepareCiBuildsMetadataForPartitioningPrimaryKey < Gitlab::Database::Migration[2.0]
disable_ddl_transaction!
TABLE_NAME = 'ci_builds_metadata'
PRIMARY_KEY = 'ci_builds_metadata_pkey'
NEW_INDEX_NAME = 'index_ci_builds_metadata_on_id_partition_id_unique'
OLD_INDEX_NAME = 'index_ci_builds_metadata_on_id_unique'
def up
with_lock_retries(raise_on_exhaustion: true) do
execute("ALTER TABLE #{TABLE_NAME} DROP CONSTRAINT #{PRIMARY_KEY} CASCADE")
rename_index(TABLE_NAME, NEW_INDEX_NAME, PRIMARY_KEY)
execute("ALTER TABLE #{TABLE_NAME} ADD CONSTRAINT #{PRIMARY_KEY} " \
"PRIMARY KEY USING INDEX #{PRIMARY_KEY}")
end
end
# rolling back this migration is time consuming with the creation of these two indexes
def down
add_concurrent_index(TABLE_NAME, :id, unique: true, name: OLD_INDEX_NAME)
add_concurrent_index(TABLE_NAME, [:id, :partition_id], unique: true, name: NEW_INDEX_NAME)
with_lock_retries(raise_on_exhaustion: true) do
execute("ALTER TABLE #{TABLE_NAME} DROP CONSTRAINT #{PRIMARY_KEY} CASCADE")
rename_index(TABLE_NAME, OLD_INDEX_NAME, PRIMARY_KEY)
execute("ALTER TABLE #{TABLE_NAME} ADD CONSTRAINT #{PRIMARY_KEY} " \
"PRIMARY KEY USING INDEX #{PRIMARY_KEY}")
end
end
end
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