Add index on public_emails for users table

Clean up issue-62684

Update issue-62684 changelog

Update down migrate for issue-62684

1 files changed, 23 insertions, 0 deletions

diff --git a/db/migrate/20190607190856_add_index_to_users_public_emails.rb b/db/migrate/20190607190856_add_index_to_users_public_emails.rb
new file mode 100644
index 00000000000..81ec38b8b32
--- /dev/null
+++ b/db/migrate/20190607190856_add_index_to_users_public_emails.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddIndexToUsersPublicEmails < ActiveRecord::Migration[5.1]
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :users, [:public_email],
+                         where: "public_email != ''"
+  end
+
+  def down
+    remove_concurrent_index :users, [:public_email],
+                         where: "public_email != ''"
+  end
+end