Ticket #20628: 20628.2.diff

wp-includes/query.php

@@ -2626 +2626 @@
                         return $r;
                 }
 
-                $split_the_query = apply_filters( 'split_the_query', ( $old_request == $this->request && "$wpdb->posts.*" == $fields && !empty( $limits) ), $this );
+                $split_the_query = ( $old_request == $this->request && "$wpdb->posts.*" == $fields && !empty( $limits ) && preg_replace( '/LIMIT ([0-9]+,)*/i', '', $limits ) < 500 );
+                $split_the_query = apply_filters( 'split_the_query', $split_the_query, $this );
 
                 if ( $split_the_query ) {
                         // First get the IDs and then fill in the objects