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Improve performance of WP_Meta_Query when doing OR queries on meta keys. Props joehoyle, SergeyBiryukov. fixes #19729
git-svn-id: http://core.svn.wordpress.org/trunk@22103 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@ -711,7 +711,30 @@ class WP_Meta_Query {
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$join = array();
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$where = array();
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foreach ( $this->queries as $k => $q ) {
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$key_only_queries = array();
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$queries = array();
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// Split out the meta_key only queries (we can only do this for OR)
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if ( 'OR' == $this->relation ) {
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foreach ( $this->queries as $k => $q ) {
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if ( ! isset( $q['value'] ) && ! empty( $q['key'] ) )
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$key_only_queries[$k] = $q;
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else
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$queries[$k] = $q;
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}
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} else {
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$queries = $this->queries;
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}
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// Specify all the meta_key only queries in one go
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if ( $key_only_queries ) {
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$join[] = "INNER JOIN $meta_table ON $primary_table.$primary_id_column = $meta_table.$meta_id_column";
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foreach ( $key_only_queries as $key => $q )
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$where["key-only-$key"] = $wpdb->prepare( "$meta_table.meta_key = %s", trim( $q['key'] ) );
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}
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foreach ( $queries as $k => $q ) {
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$meta_key = isset( $q['key'] ) ? trim( $q['key'] ) : '';
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$meta_type = isset( $q['type'] ) ? strtoupper( $q['type'] ) : 'CHAR';
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