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Ticket #44602: class-wp-meta-query.php

File class-wp-meta-query.php, 22.0 KB (added by donjajo, 5 years ago)

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1	<?php
2	/**
3	* Meta API: WP_Meta_Query class
4	*
5	* @package WordPress
6	* @subpackage Meta
7	* @since 4.4.0
8	*/
9
10	/**
11	* Core class used to implement meta queries for the Meta API.
12	*
13	* Used for generating SQL clauses that filter a primary query according to metadata keys and values.
14	*
15	* WP_Meta_Query is a helper that allows primary query classes, such as WP_Query and WP_User_Query,
16	*
17	* to filter their results by object metadata, by generating `JOIN` and `WHERE` subclauses to be attached
18	* to the primary SQL query string.
19	*
20	* @since 3.2.0
21	*/
22	class WP_Meta_Query {
23	/**
24	* Array of metadata queries.
25	*
26	* See WP_Meta_Query::__construct() for information on meta query arguments.
27	*
28	* @since 3.2.0
29	* @var array
30	*/
31	public $queries = array();
32
33	/**
34	* The relation between the queries. Can be one of 'AND' or 'OR'.
35	*
36	* @since 3.2.0
37	* @var string
38	*/
39	public $relation;
40
41	/**
42	* Database table to query for the metadata.
43	*
44	* @since 4.1.0
45	* @var string
46	*/
47	public $meta_table;
48
49	/**
50	* Column in meta_table that represents the ID of the object the metadata belongs to.
51	*
52	* @since 4.1.0
53	* @var string
54	*/
55	public $meta_id_column;
56
57	/**
58	* Database table that where the metadata's objects are stored (eg $wpdb->users).
59	*
60	* @since 4.1.0
61	* @var string
62	*/
63	public $primary_table;
64
65	/**
66	* Column in primary_table that represents the ID of the object.
67	*
68	* @since 4.1.0
69	* @var string
70	*/
71	public $primary_id_column;
72
73	/**
74	* A flat list of table aliases used in JOIN clauses.
75	*
76	* @since 4.1.0
77	* @var array
78	*/
79	protected $table_aliases = array();
80
81	/**
82	* A flat list of clauses, keyed by clause 'name'.
83	*
84	* @since 4.2.0
85	* @var array
86	*/
87	protected $clauses = array();
88
89	/**
90	* Whether the query contains any OR relations.
91	*
92	* @since 4.3.0
93	* @var bool
94	*/
95	protected $has_or_relation = false;
96
97	/**
98	* Constructor.
99	*
100	* @since 3.2.0
101	* @since 4.2.0 Introduced support for naming query clauses by associative array keys.
102	*
103	*
104	* @param array $meta_query {
105	* Array of meta query clauses. When first-order clauses or sub-clauses use strings as
106	* their array keys, they may be referenced in the 'orderby' parameter of the parent query.
107	*
108	* @type string $relation Optional. The MySQL keyword used to join
109	* the clauses of the query. Accepts 'AND', or 'OR'. Default 'AND'.
110	* @type array {
111	* Optional. An array of first-order clause parameters, or another fully-formed meta query.
112	*
113	* @type string $key Meta key to filter by.
114	* @type string $value Meta value to filter by.
115	* @type string $compare MySQL operator used for comparing the $value. Accepts '=',
116	* '!=', '>', '>=', '<', '<=', 'LIKE', 'NOT LIKE',
117	* 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN', 'REGEXP',
118	* 'NOT REGEXP', 'RLIKE', 'EXISTS' or 'NOT EXISTS'.
119	* Default is 'IN' when `$value` is an array, '=' otherwise.
120	* @type string $type MySQL data type that the meta_value column will be CAST to for
121	* comparisons. Accepts 'NUMERIC', 'BINARY', 'CHAR', 'DATE',
122	* 'DATETIME', 'DECIMAL', 'SIGNED', 'TIME', or 'UNSIGNED'.
123	* Default is 'CHAR'.
124	* }
125	* }
126	*/
127	public function __construct( $meta_query = false ) {
128	if ( !$meta_query )
129	return;
130
131	if ( isset( $meta_query['relation'] ) && strtoupper( $meta_query['relation'] ) == 'OR' ) {
132	$this->relation = 'OR';
133	} else {
134	$this->relation = 'AND';
135	}
136
137	$this->queries = $this->sanitize_query( $meta_query );
138	}
139
140	/**
141	* Ensure the 'meta_query' argument passed to the class constructor is well-formed.
142	*
143	* Eliminates empty items and ensures that a 'relation' is set.
144	*
145	* @since 4.1.0
146	*
147	* @param array $queries Array of query clauses.
148	* @return array Sanitized array of query clauses.
149	*/
150	public function sanitize_query( $queries ) {
151	$clean_queries = array();
152
153	if ( ! is_array( $queries ) ) {
154	return $clean_queries;
155	}
156
157	foreach ( $queries as $key => $query ) {
158	if ( 'relation' === $key ) {
159	$relation = $query;
160
161	} elseif ( ! is_array( $query ) ) {
162	continue;
163
164	// First-order clause.
165	} elseif ( $this->is_first_order_clause( $query ) ) {
166	if ( isset( $query['value'] ) && array() === $query['value'] ) {
167	unset( $query['value'] );
168	}
169
170	$clean_queries[ $key ] = $query;
171
172	// Otherwise, it's a nested query, so we recurse.
173	} else {
174	$cleaned_query = $this->sanitize_query( $query );
175
176	if ( ! empty( $cleaned_query ) ) {
177	$clean_queries[ $key ] = $cleaned_query;
178	}
179	}
180	}
181
182	if ( empty( $clean_queries ) ) {
183	return $clean_queries;
184	}
185
186	// Sanitize the 'relation' key provided in the query.
187	if ( isset( $relation ) && 'OR' === strtoupper( $relation ) ) {
188	$clean_queries['relation'] = 'OR';
189	$this->has_or_relation = true;
190
191	/*
192	* If there is only a single clause, call the relation 'OR'.
193	* This value will not actually be used to join clauses, but it
194	* simplifies the logic around combining key-only queries.
195	*/
196	} elseif ( 1 === count( $clean_queries ) ) {
197	$clean_queries['relation'] = 'OR';
198
199	// Default to AND.
200	} else {
201	$clean_queries['relation'] = 'AND';
202	}
203
204	return $clean_queries;
205	}
206
207	/**
208	* Determine whether a query clause is first-order.
209	*
210	* A first-order meta query clause is one that has either a 'key' or
211	* a 'value' array key.
212	*
213	* @since 4.1.0
214	*
215	* @param array $query Meta query arguments.
216	* @return bool Whether the query clause is a first-order clause.
217	*/
218	protected function is_first_order_clause( $query ) {
219	return isset( $query['key'] ) \|\| isset( $query['value'] );
220	}
221
222	/**
223	* Constructs a meta query based on 'meta_*' query vars
224	*
225	* @since 3.2.0
226	*
227	* @param array $qv The query variables
228	*/
229	public function parse_query_vars( $qv ) {
230	$meta_query = array();
231
232	/*
233	* For orderby=meta_value to work correctly, simple query needs to be
234	* first (so that its table join is against an unaliased meta table) and
235	* needs to be its own clause (so it doesn't interfere with the logic of
236	* the rest of the meta_query).
237	*/
238	$primary_meta_query = array();
239	foreach ( array( 'key', 'compare', 'type' ) as $key ) {
240	if ( ! empty( $qv[ "meta_$key" ] ) ) {
241	$primary_meta_query[ $key ] = $qv[ "meta_$key" ];
242	}
243	}
244
245	// WP_Query sets 'meta_value' = '' by default.
246	if ( isset( $qv['meta_value'] ) && '' !== $qv['meta_value'] && ( ! is_array( $qv['meta_value'] ) \|\| $qv['meta_value'] ) ) {
247	$primary_meta_query['value'] = $qv['meta_value'];
248	}
249
250	$existing_meta_query = isset( $qv['meta_query'] ) && is_array( $qv['meta_query'] ) ? $qv['meta_query'] : array();
251
252	if ( ! empty( $primary_meta_query ) && ! empty( $existing_meta_query ) ) {
253	$meta_query = array(
254	'relation' => 'AND',
255	$primary_meta_query,
256	$existing_meta_query,
257	);
258	} elseif ( ! empty( $primary_meta_query ) ) {
259	$meta_query = array(
260	$primary_meta_query,
261	);
262	} elseif ( ! empty( $existing_meta_query ) ) {
263	$meta_query = $existing_meta_query;
264	}
265
266	$this->__construct( $meta_query );
267	}
268
269	/**
270	* Return the appropriate alias for the given meta type if applicable.
271	*
272	* @since 3.7.0
273	*
274	* @param string $type MySQL type to cast meta_value.
275	* @return string MySQL type.
276	*/
277	public function get_cast_for_type( $type = '' ) {
278	if ( empty( $type ) )
279	return 'CHAR';
280
281	$meta_type = strtoupper( $type );
282
283	if ( ! preg_match( '/^(?:BINARY\|CHAR\|DATE\|DATETIME\|SIGNED\|UNSIGNED\|TIME\|NUMERIC(?:$\d+(?:,\s?\d+)?$)?\|DECIMAL(?:$\d+(?:,\s?\d+)?$)?)$/', $meta_type ) )
284	return 'CHAR';
285
286	if ( 'NUMERIC' == $meta_type )
287	$meta_type = 'SIGNED';
288
289	return $meta_type;
290	}
291
292	/**
293	* Generates SQL clauses to be appended to a main query.
294	*
295	* @since 3.2.0
296	*
297	* @param string $type Type of meta, eg 'user', 'post'.
298	* @param string $primary_table Database table where the object being filtered is stored (eg wp_users).
299	* @param string $primary_id_column ID column for the filtered object in $primary_table.
300	* @param object $context Optional. The main query object.
301	* @return false\|array {
302	* Array containing JOIN and WHERE SQL clauses to append to the main query.
303	*
304	* @type string $join SQL fragment to append to the main JOIN clause.
305	* @type string $where SQL fragment to append to the main WHERE clause.
306	* }
307	*/
308	public function get_sql( $type, $primary_table, $primary_id_column, $context = null ) {
309	if ( ! $meta_table = _get_meta_table( $type ) ) {
310	return false;
311	}
312
313	$this->table_aliases = array();
314
315	$this->meta_table = $meta_table;
316	$this->meta_id_column = sanitize_key( $type . '_id' );
317
318	$this->primary_table = $primary_table;
319	$this->primary_id_column = $primary_id_column;
320
321	$sql = $this->get_sql_clauses();
322
323	/*
324	* If any JOINs are LEFT JOINs (as in the case of NOT EXISTS), then all JOINs should
325	* be LEFT. Otherwise posts with no metadata will be excluded from results.
326	*/
327	if ( false !== strpos( $sql['join'], 'LEFT JOIN' ) ) {
328	$sql['join'] = str_replace( 'INNER JOIN', 'LEFT JOIN', $sql['join'] );
329	}
330
331	/**
332	* Filters the meta query's generated SQL.
333	*
334	* @since 3.1.0
335	*
336	* @param array $clauses Array containing the query's JOIN and WHERE clauses.
337	* @param array $queries Array of meta queries.
338	* @param string $type Type of meta.
339	* @param string $primary_table Primary table.
340	* @param string $primary_id_column Primary column ID.
341	* @param object $context The main query object.
342	*/
343	return apply_filters_ref_array( 'get_meta_sql', array( $sql, $this->queries, $type, $primary_table, $primary_id_column, $context ) );
344	}
345
346	/**
347	* Generate SQL clauses to be appended to a main query.
348	*
349	* Called by the public WP_Meta_Query::get_sql(), this method is abstracted
350	* out to maintain parity with the other Query classes.
351	*
352	* @since 4.1.0
353	*
354	* @return array {
355	* Array containing JOIN and WHERE SQL clauses to append to the main query.
356	*
357	* @type string $join SQL fragment to append to the main JOIN clause.
358	* @type string $where SQL fragment to append to the main WHERE clause.
359	* }
360	*/
361	protected function get_sql_clauses() {
362	/*
363	* $queries are passed by reference to get_sql_for_query() for recursion.
364	* To keep $this->queries unaltered, pass a copy.
365	*/
366	$queries = $this->queries;
367	$sql = $this->get_sql_for_query( $queries );
368
369	if ( ! empty( $sql['where'] ) ) {
370	$sql['where'] = ' AND ' . $sql['where'];
371	}
372
373	return $sql;
374	}
375
376	/**
377	* Generate SQL clauses for a single query array.
378	*
379	* If nested subqueries are found, this method recurses the tree to
380	* produce the properly nested SQL.
381	*
382	* @since 4.1.0
383	*
384	* @param array $query Query to parse (passed by reference).
385	* @param int $depth Optional. Number of tree levels deep we currently are.
386	* Used to calculate indentation. Default 0.
387	* @return array {
388	* Array containing JOIN and WHERE SQL clauses to append to a single query array.
389	*
390	* @type string $join SQL fragment to append to the main JOIN clause.
391	* @type string $where SQL fragment to append to the main WHERE clause.
392	* }
393	*/
394	protected function get_sql_for_query( &$query, $depth = 0 ) {
395	$sql_chunks = array(
396	'join' => array(),
397	'where' => array(),
398	);
399
400	$sql = array(
401	'join' => '',
402	'where' => '',
403	);
404
405	$indent = '';
406	for ( $i = 0; $i < $depth; $i++ ) {
407	$indent .= " ";
408	}
409
410	foreach ( $query as $key => &$clause ) {
411	if ( 'relation' === $key ) {
412	$relation = $query['relation'];
413	} elseif ( is_array( $clause ) ) {
414
415	// This is a first-order clause.
416	if ( $this->is_first_order_clause( $clause ) ) {
417	$clause_sql = $this->get_sql_for_clause( $clause, $query, $key );
418
419	$where_count = count( $clause_sql['where'] );
420	if ( ! $where_count ) {
421	$sql_chunks['where'][] = '';
422	} elseif ( 1 === $where_count ) {
423	$sql_chunks['where'][] = $clause_sql['where'][0];
424	} else {
425	$sql_chunks['where'][] = '( ' . implode( ' AND ', $clause_sql['where'] ) . ' )';
426	}
427
428	$sql_chunks['join'] = array_merge( $sql_chunks['join'], $clause_sql['join'] );
429	// This is a subquery, so we recurse.
430	} else {
431	$clause_sql = $this->get_sql_for_query( $clause, $depth + 1 );
432
433	$sql_chunks['where'][] = $clause_sql['where'];
434	$sql_chunks['join'][] = $clause_sql['join'];
435	}
436	}
437	}
438
439	// Filter to remove empties.
440	$sql_chunks['join'] = array_filter( $sql_chunks['join'] );
441	$sql_chunks['where'] = array_filter( $sql_chunks['where'] );
442
443	if ( empty( $relation ) ) {
444	$relation = 'AND';
445	}
446
447	// Filter duplicate JOIN clauses and combine into a single string.
448	if ( ! empty( $sql_chunks['join'] ) ) {
449	$sql['join'] = implode( ' ', array_unique( $sql_chunks['join'] ) );
450	}
451
452	// Generate a single WHERE clause with proper brackets and indentation.
453	if ( ! empty( $sql_chunks['where'] ) ) {
454	$sql['where'] = '( ' . "\n " . $indent . implode( ' ' . "\n " . $indent . $relation . ' ' . "\n " . $indent, $sql_chunks['where'] ) . "\n" . $indent . ')';
455	}
456
457	return $sql;
458	}
459
460	/**
461	* Generate SQL JOIN and WHERE clauses for a first-order query clause.
462	*
463	* "First-order" means that it's an array with a 'key' or 'value'.
464	*
465	* @since 4.1.0
466	*
467	* @global wpdb $wpdb WordPress database abstraction object.
468	*
469	* @param array $clause Query clause (passed by reference).
470	* @param array $parent_query Parent query array.
471	* @param string $clause_key Optional. The array key used to name the clause in the original `$meta_query`
472	* parameters. If not provided, a key will be generated automatically.
473	* @return array {
474	* Array containing JOIN and WHERE SQL clauses to append to a first-order query.
475	*
476	* @type string $join SQL fragment to append to the main JOIN clause.
477	* @type string $where SQL fragment to append to the main WHERE clause.
478	* }
479	*/
480	public function get_sql_for_clause( &$clause, $parent_query, $clause_key = '' ) {
481	global $wpdb;
482
483	$sql_chunks = array(
484	'where' => array(),
485	'join' => array(),
486	);
487
488	if ( isset( $clause['compare'] ) ) {
489	$clause['compare'] = strtoupper( $clause['compare'] );
490	} else {
491	$clause['compare'] = isset( $clause['value'] ) && is_array( $clause['value'] ) ? 'IN' : '=';
492	}
493
494	if ( ! in_array( $clause['compare'], array(
495	'=', '!=', '>', '>=', '<', '<=',
496	'LIKE', 'NOT LIKE',
497	'IN', 'NOT IN',
498	'BETWEEN', 'NOT BETWEEN',
499	'EXISTS', 'NOT EXISTS',
500	'REGEXP', 'NOT REGEXP', 'RLIKE', 'FIND_IN_SET'
501	) ) ) {
502	$clause['compare'] = '=';
503	}
504
505	$meta_compare = $clause['compare'];
506
507	// First build the JOIN clause, if one is required.
508	$join = '';
509
510	// We prefer to avoid joins if possible. Look for an existing join compatible with this clause.
511	$alias = $this->find_compatible_table_alias( $clause, $parent_query );
512	if ( false === $alias ) {
513	$i = count( $this->table_aliases );
514	$alias = $i ? 'mt' . $i : $this->meta_table;
515
516	// JOIN clauses for NOT EXISTS have their own syntax.
517	if ( 'NOT EXISTS' === $meta_compare ) {
518	$join .= " LEFT JOIN $this->meta_table";
519	$join .= $i ? " AS $alias" : '';
520	$join .= $wpdb->prepare( " ON ($this->primary_table.$this->primary_id_column = $alias.$this->meta_id_column AND $alias.meta_key = %s )", $clause['key'] );
521
522	// All other JOIN clauses.
523	} else {
524	$join .= " INNER JOIN $this->meta_table";
525	$join .= $i ? " AS $alias" : '';
526	$join .= " ON ( $this->primary_table.$this->primary_id_column = $alias.$this->meta_id_column )";
527	}
528
529	$this->table_aliases[] = $alias;
530	$sql_chunks['join'][] = $join;
531	}
532
533	// Save the alias to this clause, for future siblings to find.
534	$clause['alias'] = $alias;
535
536	// Determine the data type.
537	$_meta_type = isset( $clause['type'] ) ? $clause['type'] : '';
538	$meta_type = $this->get_cast_for_type( $_meta_type );
539	$clause['cast'] = $meta_type;
540
541	// Fallback for clause keys is the table alias. Key must be a string.
542	if ( is_int( $clause_key ) \|\| ! $clause_key ) {
543	$clause_key = $clause['alias'];
544	}
545
546	// Ensure unique clause keys, so none are overwritten.
547	$iterator = 1;
548	$clause_key_base = $clause_key;
549	while ( isset( $this->clauses[ $clause_key ] ) ) {
550	$clause_key = $clause_key_base . '-' . $iterator;
551	$iterator++;
552	}
553
554	// Store the clause in our flat array.
555	$this->clauses[ $clause_key ] =& $clause;
556
557	// Next, build the WHERE clause.
558
559	// meta_key.
560	if ( array_key_exists( 'key', $clause ) ) {
561	if ( 'NOT EXISTS' === $meta_compare ) {
562	$sql_chunks['where'][] = $alias . '.' . $this->meta_id_column . ' IS NULL';
563	} else {
564	$sql_chunks['where'][] = $wpdb->prepare( "$alias.meta_key = %s", trim( $clause['key'] ) );
565	}
566	}
567
568	// meta_value.
569	if ( array_key_exists( 'value', $clause ) ) {
570	$meta_value = $clause['value'];
571
572	if ( in_array( $meta_compare, array( 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' ) ) ) {
573	if ( ! is_array( $meta_value ) ) {
574	$meta_value = preg_split( '/[,\s]+/', $meta_value );
575	}
576	} else {
577	$meta_value = trim( $meta_value );
578	}
579
580	switch ( $meta_compare ) {
581	case 'IN' :
582	case 'NOT IN' :
583	$meta_compare_string = '(' . substr( str_repeat( ',%s', count( $meta_value ) ), 1 ) . ')';
584	$where = $wpdb->prepare( $meta_compare_string, $meta_value );
585	break;
586
587	case 'BETWEEN' :
588	case 'NOT BETWEEN' :
589	$meta_value = array_slice( $meta_value, 0, 2 );
590	$where = $wpdb->prepare( '%s AND %s', $meta_value );
591	break;
592
593	case 'LIKE' :
594	case 'NOT LIKE' :
595	$meta_value = '%' . $wpdb->esc_like( $meta_value ) . '%';
596	$where = $wpdb->prepare( '%s', $meta_value );
597	break;
598
599	// EXISTS with a value is interpreted as '='.
600	case 'EXISTS' :
601	$meta_compare = '=';
602	$where = $wpdb->prepare( '%s', $meta_value );
603	break;
604
605	// 'value' is ignored for NOT EXISTS.
606	case 'NOT EXISTS' :
607	$where = '';
608	break;
609
610	case 'FIND_IN_SET':
611	$where = $wpdb->prepare( "FIND_IN_SET( %s, $alias.meta_value )", $meta_value );
612	break;
613
614	default :
615	$where = $wpdb->prepare( '%s', $meta_value );
616	break;
617
618	}
619
620	if ( $where ) {
621	if( 'FIND_IN_SET' == $meta_compare )
622	$sql_chunks['where'][] = $where;
623	else {
624	if ( 'CHAR' === $meta_type ) {
625	$sql_chunks['where'][] = "$alias.meta_value {$meta_compare} {$where}";
626	} else {
627	$sql_chunks['where'][] = "CAST($alias.meta_value AS {$meta_type}) {$meta_compare} {$where}";
628	}
629	}
630	}
631	}
632
633	/*
634	* Multiple WHERE clauses (for meta_key and meta_value) should
635	* be joined in parentheses.
636	*/
637	if ( 1 < count( $sql_chunks['where'] ) ) {
638	$sql_chunks['where'] = array( '( ' . implode( ' AND ', $sql_chunks['where'] ) . ' )' );
639	}
640
641	return $sql_chunks;
642	}
643
644	/**
645	* Get a flattened list of sanitized meta clauses.
646	*
647	* This array should be used for clause lookup, as when the table alias and CAST type must be determined for
648	* a value of 'orderby' corresponding to a meta clause.
649	*
650	* @since 4.2.0
651	*
652	* @return array Meta clauses.
653	*/
654	public function get_clauses() {
655	return $this->clauses;
656	}
657
658	/**
659	* Identify an existing table alias that is compatible with the current
660	* query clause.
661	*
662	* We avoid unnecessary table joins by allowing each clause to look for
663	* an existing table alias that is compatible with the query that it
664	* needs to perform.
665	*
666	* An existing alias is compatible if (a) it is a sibling of `$clause`
667	* (ie, it's under the scope of the same relation), and (b) the combination
668	* of operator and relation between the clauses allows for a shared table join.
669	* In the case of WP_Meta_Query, this only applies to 'IN' clauses that are
670	* connected by the relation 'OR'.
671	*
672	* @since 4.1.0
673	*
674	* @param array $clause Query clause.
675	* @param array $parent_query Parent query of $clause.
676	* @return string\|bool Table alias if found, otherwise false.
677	*/
678	protected function find_compatible_table_alias( $clause, $parent_query ) {
679	$alias = false;
680
681	foreach ( $parent_query as $sibling ) {
682	// If the sibling has no alias yet, there's nothing to check.
683	if ( empty( $sibling['alias'] ) ) {
684	continue;
685	}
686
687	// We're only interested in siblings that are first-order clauses.
688	if ( ! is_array( $sibling ) \|\| ! $this->is_first_order_clause( $sibling ) ) {
689	continue;
690	}
691
692	$compatible_compares = array();
693
694	// Clauses connected by OR can share joins as long as they have "positive" operators.
695	if ( 'OR' === $parent_query['relation'] ) {
696	$compatible_compares = array( '=', 'IN', 'BETWEEN', 'LIKE', 'REGEXP', 'RLIKE', '>', '>=', '<', '<=' );
697
698	// Clauses joined by AND with "negative" operators share a join only if they also share a key.
699	} elseif ( isset( $sibling['key'] ) && isset( $clause['key'] ) && $sibling['key'] === $clause['key'] ) {
700	$compatible_compares = array( '!=', 'NOT IN', 'NOT LIKE' );
701	}
702
703	$clause_compare = strtoupper( $clause['compare'] );
704	$sibling_compare = strtoupper( $sibling['compare'] );
705	if ( in_array( $clause_compare, $compatible_compares ) && in_array( $sibling_compare, $compatible_compares ) ) {
706	$alias = $sibling['alias'];
707	break;
708	}
709	}
710
711	/**
712	* Filters the table alias identified as compatible with the current clause.
713	*
714	* @since 4.1.0
715	*
716	* @param string\|bool $alias Table alias, or false if none was found.
717	* @param array $clause First-order query clause.
718	* @param array $parent_query Parent of $clause.
719	* @param object $this WP_Meta_Query object.
720	*/
721	return apply_filters( 'meta_query_find_compatible_table_alias', $alias, $clause, $parent_query, $this ) ;
722	}
723
724	/**
725	* Checks whether the current query has any OR relations.
726	*
727	* In some cases, the presence of an OR relation somewhere in the query will require
728	* the use of a `DISTINCT` or `GROUP BY` keyword in the `SELECT` clause. The current
729	* method can be used in these cases to determine whether such a clause is necessary.
730	*
731	* @since 4.3.0
732	*
733	* @return bool True if the query contains any `OR` relations, otherwise false.
734	*/
735	public function has_or_relation() {
736	return $this->has_or_relation;
737	}
738	}

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Ticket #44602: class-wp-meta-query.php

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