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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class ReworkRedirectRoutesIndexes < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
disable_ddl_transaction!
INDEX_NAME_UNIQUE = "index_redirect_routes_on_path_unique_text_pattern_ops"
INDEX_NAME_PERM = "index_redirect_routes_on_path_text_pattern_ops_where_permanent"
INDEX_NAME_TEMP = "index_redirect_routes_on_path_text_pattern_ops_where_temporary"
OLD_INDEX_NAME_PATH_TPOPS = "index_redirect_routes_on_path_text_pattern_ops"
OLD_INDEX_NAME_PATH_LOWER = "index_on_redirect_routes_lower_path"
def up
disable_statement_timeout do
# this is a plain btree on a single boolean column. It'll never be
# selective enough to be valuable.
if index_exists?(:redirect_routes, :permanent)
remove_concurrent_index(:redirect_routes, :permanent)
end
if_not_exists = Gitlab::Database.version.to_f >= 9.5 ? "IF NOT EXISTS" : ""
# Unique index on lower(path) across both types of redirect_routes:
execute("CREATE UNIQUE INDEX CONCURRENTLY #{if_not_exists} #{INDEX_NAME_UNIQUE} ON redirect_routes (lower(path) varchar_pattern_ops);")
# Make two indexes on path -- one for permanent and one for temporary routes:
execute("CREATE INDEX CONCURRENTLY #{if_not_exists} #{INDEX_NAME_PERM} ON redirect_routes (lower(path) varchar_pattern_ops) where (permanent);")
execute("CREATE INDEX CONCURRENTLY #{if_not_exists} #{INDEX_NAME_TEMP} ON redirect_routes (lower(path) varchar_pattern_ops) where (not permanent or permanent is null) ;")
# Remove the old indexes:
# This one needed to be on lower(path) but wasn't so it's replaced with the two above
execute "DROP INDEX CONCURRENTLY IF EXISTS #{OLD_INDEX_NAME_PATH_TPOPS};"
# This one isn't needed because we only ever do = and LIKE on this
# column so the varchar_pattern_ops index is sufficient
execute "DROP INDEX CONCURRENTLY IF EXISTS #{OLD_INDEX_NAME_PATH_LOWER};"
end
end
def down
disable_statement_timeout do
add_concurrent_index(:redirect_routes, :permanent)
execute("CREATE INDEX CONCURRENTLY #{OLD_INDEX_NAME_PATH_TPOPS} ON redirect_routes (path varchar_pattern_ops);")
execute("CREATE INDEX CONCURRENTLY #{OLD_INDEX_NAME_PATH_LOWER} ON redirect_routes (LOWER(path));")
execute("DROP INDEX CONCURRENTLY IF EXISTS #{INDEX_NAME_UNIQUE};")
execute("DROP INDEX CONCURRENTLY IF EXISTS #{INDEX_NAME_PERM};")
execute("DROP INDEX CONCURRENTLY IF EXISTS #{INDEX_NAME_TEMP};")
end
end
end
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