Ticket #57416: 57416.diff

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

@@ -3269 +3269 @@
                }
 
                if ( null === $this->posts ) {
-                       $split_the_query = ( $old_request == $this->request && "{$wpdb->posts}.*" === $fields && ! empty( $limits ) && $q['posts_per_page'] < 500 );
+                       if ( $q['posts_per_page'] == 1 ) {
+                               $split_the_query = false;
+                       }
+                       else {
+                               $split_the_query = ( $old_request == $this->request && "{$wpdb->posts}.*" === $fields && ! empty( $limits ) && $q['posts_per_page'] < 500 );
 
-                       /**
-                        * Filters whether to split the query.
-                        *
-                        * Splitting the query will cause it to fetch just the IDs of the found posts
-                        * (and then individually fetch each post by ID), rather than fetching every
-                        * complete row at once. One massive result vs. many small results.
-                        *
-                        * @since 3.4.0
-                        *
-                        * @param bool     $split_the_query Whether or not to split the query.
-                        * @param WP_Query $query           The WP_Query instance.
-                        */
-                       $split_the_query = apply_filters( 'split_the_query', $split_the_query, $this );
+                               /**
+                                * Filters whether to split the query.
+                                *
+                                * Splitting the query will cause it to fetch just the IDs of the found posts
+                                * (and then individually fetch each post by ID), rather than fetching every
+                                * complete row at once. One massive result vs. many small results.
+                                *
+                                * @since 3.4.0
+                                *
+                                * @param bool     $split_the_query Whether or not to split the query.
+                                * @param WP_Query $query           The WP_Query instance.
+                                */
+                               $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.