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Avoid returning duplicate matches when using a meta query in WP_User_Query.

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A meta_query containing an `OR` relation can result in the same record matching
multiple clauses, leading to duplicate results. The previous prevention against
duplicates [18178] #17582 became unreliable in 4.1 when `WP_Meta_Query`
introduced support for nested clauses. The current changeset adds a new method
`WP_Meta_Query::has_or_relation()` for checking whether an `OR` relation
appears anywhere in the query, and uses the new method in `WP_User_Query` to
enforce distinct results as necessary.

Props maxxsnake.
Fixes #32592.
Built from https://develop.svn.wordpress.org/trunk@32713


git-svn-id: http://core.svn.wordpress.org/trunk@32683 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Boone Gorges 2015-06-09 17:42:28 +00:00
parent 6657e42c7d
commit 5dfd6a02a7
3 changed files with 27 additions and 2 deletions
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25
wp-includes/meta.php
View File

@ -953,6 +953,15 @@ class WP_Meta_Query {
*/
protected $clauses = array();
/**
* Whether the query contains any OR relations.
*
* @since 4.3.0
* @access protected
* @var bool
*/
protected $has_or_relation = false;
/**
* Constructor.
*
@ -1046,6 +1055,7 @@ class WP_Meta_Query {
// Sanitize the 'relation' key provided in the query.
if ( isset( $relation ) && 'OR' === strtoupper( $relation ) ) {
$clean_queries['relation'] = 'OR';
$this->has_or_relation = true;
/*
* If there is only a single clause, call the relation 'OR'.
@ -1578,6 +1588,21 @@ class WP_Meta_Query {
*/
return apply_filters( 'meta_query_find_compatible_table_alias', $alias, $clause, $parent_query, $this ) ;
}
/**
* Check whether the current query has any OR relations.
*
* In some cases, the presence of an OR relation somewhere in the query will require the use of a DISTINCT or
* GROUP BY keyword in the SELECT clause. The current method can be used in these cases to determine whether
* such a clause is necessary.
*
* @since 4.3.0
*
* @return bool True if the query contains any OR relations, otherwise false.
*/
public function has_or_relation() {
return $this->has_or_relation;
}
}
/**

2
wp-includes/user.php
View File

@ -709,7 +709,7 @@ class WP_User_Query {
$this->query_from .= $clauses['join'];
$this->query_where .= $clauses['where'];
if ( 'OR' == $this->meta_query->relation ) {
if ( $this->meta_query->has_or_relation() ) {
$this->query_fields = 'DISTINCT ' . $this->query_fields;
}
}

2
wp-includes/version.php
View File

@ -4,7 +4,7 @@
*
* @global string $wp_version
*/
$wp_version = '4.3-alpha-32712';
$wp_version = '4.3-alpha-32713';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.