How about add index to type column

[bscheshirwork]

We have a migration

yii2-gallery-manager/migrations/m140930_003227_gallery_manager.php

Lines 16 to 23 in f6da898

	array(
	'id' => Schema::TYPE_PK,
	'type' => Schema::TYPE_STRING,
	'ownerId' => Schema::TYPE_STRING . ' NOT NULL',
	'rank' => Schema::TYPE_INTEGER . ' NOT NULL DEFAULT 0',
	'name' => Schema::TYPE_STRING,
	'description' => Schema::TYPE_TEXT
	)

without index of type column. This column contain a grouping index

         'galleryBehavior' => [
             'class' => GalleryBehavior::className(),
             'type' => 'product',

and contain 1~10 items of common case. Look like good idea to create index of this.