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<title>[41880] trunk: Don't force distinct term queries when specifying `number` and `object_ids`.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/41880">41880</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/41880","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>boonebgorges</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2017-10-16 18:34:29 +0000 (Mon, 16 Oct 2017)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Don't force distinct term queries when specifying `number` and `object_ids`.

This reverts <a href="https://core.trac.wordpress.org/changeset/41377">[41377]</a>, which caused performance problems on sites with a large
number of terms.

See <a href="https://core.trac.wordpress.org/ticket/41796">#41796</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswptermqueryphp">trunk/src/wp-includes/class-wp-term-query.php</a></li>
<li><a href="#trunktestsphpunitteststermqueryphp">trunk/tests/phpunit/tests/term/query.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesclasswptermqueryphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/class-wp-term-query.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-term-query.php     2017-10-16 18:14:33 UTC (rev 41879)
+++ trunk/src/wp-includes/class-wp-term-query.php       2017-10-16 18:34:29 UTC (rev 41880)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -553,17 +553,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $limits = '';
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $do_distinct = false;
</del><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                /*
-                * Duplicate terms are generally removed when necessary after the database query.
-                * But when a LIMIT clause is included in the query, we let MySQL enforce
-                * distinctness so the count is correct.
-                */
-               if ( ! empty( $limits ) && 'all_with_object_id' !== $args['fields'] ) {
-                       $do_distinct = true;
-               }
-
</del><span class="cx" style="display: block; padding: 0 10px">                 if ( ! empty( $args['search'] ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->sql_clauses['where']['search'] = $this->get_search_sql( $args['search'] );
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -580,7 +570,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">                if ( ! empty( $meta_clauses ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        $join .= $mq_sql['join'];
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->sql_clauses['where']['meta_query'] = preg_replace( '/^\s*AND\s*/', '', $mq_sql['where'] );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $do_distinct = true;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $distinct .= "DISTINCT";
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $selects = array();
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -642,8 +633,6 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $where = implode( ' AND ', $this->sql_clauses['where'] );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $distinct = $do_distinct ? 'DISTINCT' : '';
-
</del><span class="cx" style="display: block; padding: 0 10px">                 /**
</span><span class="cx" style="display: block; padding: 0 10px">                 * Filters the terms query SQL clauses.
</span><span class="cx" style="display: block; padding: 0 10px">                 *
</span></span></pre></div>
<a id="trunktestsphpunitteststermqueryphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/term/query.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/term/query.php  2017-10-16 18:14:33 UTC (rev 41879)
+++ trunk/tests/phpunit/tests/term/query.php    2017-10-16 18:34:29 UTC (rev 41880)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -471,61 +471,4 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertSame( $expected, $found2 );
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertSame( $expected, $found3 );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-
-       /**
-        * @ticket 41796
-        */
-       public function test_number_should_work_with_object_ids() {
-               register_taxonomy( 'wptests_tax', 'post' );
-
-               $term_1 = self::factory()->term->create( array(
-                       'taxonomy' => 'wptests_tax',
-               ) );
-               $term_2 = self::factory()->term->create( array(
-                       'taxonomy' => 'wptests_tax',
-               ) );
-
-               $post_1 = self::factory()->post->create();
-               $post_2 = self::factory()->post->create();
-
-               wp_set_object_terms( $post_1, array( $term_1, $term_2 ), 'wptests_tax' );
-               wp_set_object_terms( $post_2, array( $term_1 ), 'wptests_tax' );
-
-               $q = new WP_Term_Query( array(
-                       'taxonomy' => 'wptests_tax',
-                       'object_ids' => array( $post_1, $post_2 ),
-                       'number' => 2,
-               ) );
-
-               $this->assertEqualSets( array( $term_1, $term_2 ), wp_list_pluck( $q->terms, 'term_id' ) );
-       }
-
-       /**
-        * @ticket 41796
-        */
-       public function test_number_should_work_with_object_ids_and_all_with_object_id() {
-               register_taxonomy( 'wptests_tax', 'post' );
-
-               $term_1 = self::factory()->term->create( array(
-                       'taxonomy' => 'wptests_tax',
-               ) );
-               $term_2 = self::factory()->term->create( array(
-                       'taxonomy' => 'wptests_tax',
-               ) );
-
-               $post_1 = self::factory()->post->create();
-               $post_2 = self::factory()->post->create();
-
-               wp_set_object_terms( $post_1, array( $term_1, $term_2 ), 'wptests_tax' );
-               wp_set_object_terms( $post_2, array( $term_1 ), 'wptests_tax' );
-
-               $q = new WP_Term_Query( array(
-                       'taxonomy' => 'wptests_tax',
-                       'object_ids' => array( $post_1, $post_2 ),
-                       'fields' => 'all_with_object_id',
-                       'number' => 2,
-               ) );
-
-               $this->assertEqualSets( array( $term_1, $term_1 ), wp_list_pluck( $q->terms, 'term_id' ) );
-       }
</del><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre>
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