Ticket #39090: 39090.patch

src/wp-includes/class-wp-user-query.php

@@ -596 +596 @@
 
                 $this->request = "SELECT $this->query_fields $this->query_from $this->query_where $this->query_orderby $this->query_limit";
 
-                if ( is_array( $qv['fields'] ) || 'all' == $qv['fields'] ) {
-                        $this->results = $wpdb->get_results( $this->request );
-                } else {
-                        $this->results = $wpdb->get_col( $this->request );
+                $cache_key = 'user_query_' . md5( $this->request );
+                $this->results = wp_cache_get( $cache_key, 'users' );
+
+                if ( ! $this->results ) {
+                        if ( is_array( $qv['fields'] ) || 'all' == $qv['fields'] ) {
+                                $this->results = $wpdb->get_results( $this->request );
+                        } else {
+                                $this->results = $wpdb->get_col( $this->request );
+                        }
+
+                        wp_cache_add( $cache_key, $this->results, 'users' );
                 }
 
                 /**