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# frozen_string_literal: true
class AddPostgresIndexView < ActiveRecord::Migration[6.0]
DOWNTIME = false
def up
execute(<<~SQL)
CREATE VIEW postgres_indexes AS
SELECT
pg_namespace.nspname || '.' || pg_class.relname as identifier,
pg_index.indexrelid,
pg_namespace.nspname as schema,
pg_class.relname as name,
pg_index.indisunique as unique,
pg_index.indisvalid as valid_index,
pg_class.relispartition as partitioned,
pg_index.indisexclusion as exclusion,
pg_indexes.indexdef as definition,
pg_relation_size(pg_class.oid) as ondisk_size_bytes
FROM pg_index
INNER JOIN pg_class ON pg_class.oid = pg_index.indexrelid
INNER JOIN pg_namespace ON pg_class.relnamespace = pg_namespace.oid
INNER JOIN pg_indexes ON pg_class.relname = pg_indexes.indexname
WHERE pg_namespace.nspname <> 'pg_catalog'
SQL
end
def down
execute(<<~SQL)
DROP VIEW postgres_indexes
SQL
end
end
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