Ticket #20006: 20006.2.patch

wp-includes/comment.php

@@ -349 +349 @@
                 $post_fields = array_filter( compact( array( 'post_author', 'post_name', 'post_parent', 'post_status', 'post_type', ) ) );
                 if ( ! empty( $post_fields ) ) {
                         $join = "JOIN $wpdb->posts ON $wpdb->posts.ID = $wpdb->comments.comment_post_ID";
-                        foreach( $post_fields as $field_name => $field_value )
-                                $where .= $wpdb->prepare( " AND {$wpdb->posts}.{$field_name} = %s", $field_value );
+                        foreach( $post_fields as $field_name => $field_value ) {
+                                $field_value = (array)$field_value;
+                                $where .= $wpdb->prepare( " AND ( {$wpdb->posts}.{$field_name} = %s", array_pop($field_value));
+                                foreach ( $field_value as $value ) {
+                                        $where .= $wpdb->prepare( " OR {$wpdb->posts}.{$field_name} = %s", $value );
+                                }
+                                $where .= $wpdb->prepare( " ) ");
+                        }
                 }
 
                 if ( ! empty( $this->meta_query->queries ) ) {