1 files changed, 20 insertions, 0 deletions
diff --git a/db/migrate/20201110133629_change_index_mr_metrics_target_project_id.rb b/db/migrate/20201110133629_change_index_mr_metrics_target_project_id.rb
new file mode 100644
index 00000000000..5bd810207d8
--- /dev/null
+++ b/db/migrate/20201110133629_change_index_mr_metrics_target_project_id.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+class ChangeIndexMrMetricsTargetProjectId < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+  disable_ddl_transaction!
+
+  DOWNTIME = false
+  INDEX_NAME = 'index_merge_request_metrics_on_target_project_id_merged_at'
+  NULLS_LAST_INDEX_NAME = 'index_mr_metrics_on_target_project_id_merged_at_nulls_last'
+
+  def up
+    add_concurrent_index :merge_request_metrics, [:target_project_id, :merged_at, :id], order: { merged_at: 'DESC NULLS LAST', id: 'DESC' }, name: NULLS_LAST_INDEX_NAME
+    remove_concurrent_index_by_name(:merge_request_metrics, INDEX_NAME)
+  end
+
+  def down
+    add_concurrent_index :merge_request_metrics, [:target_project_id, :merged_at], name: INDEX_NAME
+    remove_concurrent_index_by_name(:merge_request_metrics, NULLS_LAST_INDEX_NAME)
+  end
+end