1 files changed, 28 insertions, 0 deletions
diff --git a/db/migrate/20180309160427_add_partial_indexes_on_todos.rb b/db/migrate/20180309160427_add_partial_indexes_on_todos.rb
new file mode 100644
index 00000000000..18a5c69df1b
--- /dev/null
+++ b/db/migrate/20180309160427_add_partial_indexes_on_todos.rb
@@ -0,0 +1,28 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddPartialIndexesOnTodos < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+   disable_ddl_transaction!
+
+   INDEX_NAME_PENDING="index_todos_on_user_id_and_id_pending"
+   INDEX_NAME_DONE="index_todos_on_user_id_and_id_done"
+   
+  def up
+    unless index_exists?(:todos, [:user_id, :id], name: INDEX_NAME_PENDING)
+      add_concurrent_index(:todos, [:user_id, :id], where: "state='pending'", name: INDEX_NAME_PENDING)
+    end
+    unless index_exists?(:todos, [:user_id, :id], name: INDEX_NAME_DONE)
+      add_concurrent_index(:todos, [:user_id, :id], where: "state='done'", name: INDEX_NAME_DONE)
+    end
+  end
+
+  def down
+    remove_concurrent_index(:todos, [:user_id, :id], where: "state='pending'", name: INDEX_NAME_PENDING)
+    remove_concurrent_index(:todos, [:user_id, :id], where: "state='done'", name: INDEX_NAME_DONE)
+  end    
+end