1 files changed, 44 insertions, 0 deletions
diff --git a/db/post_migrate/20201106082723_add_merge_request_jira_reference_indexes.rb b/db/post_migrate/20201106082723_add_merge_request_jira_reference_indexes.rb
new file mode 100644
index 00000000000..d69f57c6088
--- /dev/null
+++ b/db/post_migrate/20201106082723_add_merge_request_jira_reference_indexes.rb
@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+class AddMergeRequestJiraReferenceIndexes < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  DESCRIPTION_INDEX_NAME = 'index_merge_requests_on_target_project_id_iid_jira_description'
+  TITLE_INDEX_NAME = 'index_merge_requests_on_target_project_id_and_iid_jira_title'
+
+  JIRA_KEY_REGEX = '[A-Z][A-Z_0-9]+-\d+'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index(
+      :merge_requests,
+      [:target_project_id, :iid],
+      name: TITLE_INDEX_NAME,
+      using: :btree,
+      where: "(merge_requests.title)::text ~ '#{JIRA_KEY_REGEX}'::text"
+    )
+
+    add_concurrent_index(
+      :merge_requests,
+      [:target_project_id, :iid],
+      name: DESCRIPTION_INDEX_NAME,
+      using: :btree,
+      where: "(merge_requests.description)::text ~ '#{JIRA_KEY_REGEX}'::text"
+    )
+  end
+
+  def down
+    remove_concurrent_index_by_name(
+      :merge_requests,
+      TITLE_INDEX_NAME
+    )
+
+    remove_concurrent_index_by_name(
+      :merge_requests,
+      DESCRIPTION_INDEX_NAME
+    )
+  end
+end