Add gin index for namespaces.traversal_ids

changelogs/unreleased/325636-index-namespaces-traversal_ids.yml

+---
+title: Add gin index for namespaces.traversal_ids
+merge_request: 57207
+author:
+type: performance

db/migrate/20210323064751_add_namespace_traversal_ids_index.rb

+# frozen_string_literal: true
+
+class AddNamespaceTraversalIdsIndex < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_NAME = 'index_namespaces_on_traversal_ids'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :namespaces, :traversal_ids, using: :gin, name: INDEX_NAME
+  end
+
+  def down
+    remove_concurrent_index_by_name :namespaces, INDEX_NAME
+  end
+end

db/schema_migrations/20210323064751

+4ef75890cf2c30954e0d1ff04c75b58cb910315ea1ed345e351edd035b681cc6
\ No newline at end of file

db/structure.sql

@@ -23132,6 +23132,8 @@ CREATE UNIQUE INDEX index_namespaces_on_runners_token_encrypted ON namespaces US
 
 CREATE INDEX index_namespaces_on_shared_and_extra_runners_minutes_limit ON namespaces USING btree (shared_runners_minutes_limit, extra_shared_runners_minutes_limit);
 
+CREATE INDEX index_namespaces_on_traversal_ids ON namespaces USING gin (traversal_ids);
+
 CREATE INDEX index_namespaces_on_type_and_id_partial ON namespaces USING btree (type, id) WHERE (type IS NOT NULL);
 
 CREATE INDEX index_non_requested_project_members_on_source_id_and_type ON members USING btree (source_id, source_type) WHERE ((requested_at IS NULL) AND ((type)::text = 'ProjectMember'::text));