1 files changed, 29 insertions, 0 deletions
diff --git a/db/post_migrate/20200608203426_set_proper_lock_version_indices.rb b/db/post_migrate/20200608203426_set_proper_lock_version_indices.rb
new file mode 100644
index 00000000000..924ca73e6cc
--- /dev/null
+++ b/db/post_migrate/20200608203426_set_proper_lock_version_indices.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class SetProperLockVersionIndices < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    remove_concurrent_index :epics, :lock_version, where: "lock_version IS NULL"
+    remove_concurrent_index :merge_requests, :lock_version, where: "lock_version IS NULL"
+    remove_concurrent_index :issues, :lock_version, where: "lock_version IS NULL"
+
+    add_concurrent_index :epics, :id, where: "lock_version IS NULL", name: 'index_epics_on_id'
+    add_concurrent_index :merge_requests, :id, where: "lock_version IS NULL", name: 'index_merge_requests_on_id'
+    add_concurrent_index :issues, :id, where: "lock_version IS NULL", name: 'index_issues_on_id'
+  end
+
+  def down
+    add_concurrent_index :epics, :lock_version, where: "lock_version IS NULL"
+    add_concurrent_index :merge_requests, :lock_version, where: "lock_version IS NULL"
+    add_concurrent_index :issues, :lock_version, where: "lock_version IS NULL"
+
+    remove_concurrent_index_by_name :epics, name: 'index_epics_on_id'
+    remove_concurrent_index_by_name :merge_requests, name: 'index_merge_requests_on_id'
+    remove_concurrent_index_by_name :issues, name: 'index_issues_on_id'
+  end
+end