Changeset 33761 for trunk/src/wp-includes/meta-functions.php
- Timestamp:
- 08/26/2015 01:01:22 PM (9 years ago)
- File:
-
- 1 copied
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trunk/src/wp-includes/meta-functions.php
r33758 r33761 870 870 871 871 /** 872 * Class for generating SQL clauses that filter a primary query according to metadata keys and values.873 *874 * `WP_Meta_Query` is a helper that allows primary query classes, such as {@see WP_Query} and {@see WP_User_Query},875 * to filter their results by object metadata, by generating `JOIN` and `WHERE` subclauses to be attached876 * to the primary SQL query string.877 *878 * @since 3.2.0879 */880 class WP_Meta_Query {881 /**882 * Array of metadata queries.883 *884 * See {@see WP_Meta_Query::__construct()} for information on meta query arguments.885 *886 * @since 3.2.0887 * @access public888 * @var array889 */890 public $queries = array();891 892 /**893 * The relation between the queries. Can be one of 'AND' or 'OR'.894 *895 * @since 3.2.0896 * @access public897 * @var string898 */899 public $relation;900 901 /**902 * Database table to query for the metadata.903 *904 * @since 4.1.0905 * @access public906 * @var string907 */908 public $meta_table;909 910 /**911 * Column in meta_table that represents the ID of the object the metadata belongs to.912 *913 * @since 4.1.0914 * @access public915 * @var string916 */917 public $meta_id_column;918 919 /**920 * Database table that where the metadata's objects are stored (eg $wpdb->users).921 *922 * @since 4.1.0923 * @access public924 * @var string925 */926 public $primary_table;927 928 /**929 * Column in primary_table that represents the ID of the object.930 *931 * @since 4.1.0932 * @access public933 * @var string934 */935 public $primary_id_column;936 937 /**938 * A flat list of table aliases used in JOIN clauses.939 *940 * @since 4.1.0941 * @access protected942 * @var array943 */944 protected $table_aliases = array();945 946 /**947 * A flat list of clauses, keyed by clause 'name'.948 *949 * @since 4.2.0950 * @access protected951 * @var array952 */953 protected $clauses = array();954 955 /**956 * Whether the query contains any OR relations.957 *958 * @since 4.3.0959 * @access protected960 * @var bool961 */962 protected $has_or_relation = false;963 964 /**965 * Constructor.966 *967 * @since 3.2.0968 * @since 4.2.0 Introduced support for naming query clauses by associative array keys.969 *970 * @access public971 *972 * @param array $meta_query {973 * Array of meta query clauses. When first-order clauses use strings as their array keys, they may be974 * referenced in the 'orderby' parameter of the parent query.975 *976 * @type string $relation Optional. The MySQL keyword used to join977 * the clauses of the query. Accepts 'AND', or 'OR'. Default 'AND'.978 * @type array {979 * Optional. An array of first-order clause parameters, or another fully-formed meta query.980 *981 * @type string $key Meta key to filter by.982 * @type string $value Meta value to filter by.983 * @type string $compare MySQL operator used for comparing the $value. Accepts '=',984 * '!=', '>', '>=', '<', '<=', 'LIKE', 'NOT LIKE', 'IN', 'NOT IN',985 * 'BETWEEN', 'NOT BETWEEN', 'REGEXP', 'NOT REGEXP', or 'RLIKE'.986 * Default is 'IN' when `$value` is an array, '=' otherwise.987 * @type string $type MySQL data type that the meta_value column will be CAST to for988 * comparisons. Accepts 'NUMERIC', 'BINARY', 'CHAR', 'DATE',989 * 'DATETIME', 'DECIMAL', 'SIGNED', 'TIME', or 'UNSIGNED'.990 * Default is 'CHAR'.991 * }992 * }993 */994 public function __construct( $meta_query = false ) {995 if ( !$meta_query )996 return;997 998 if ( isset( $meta_query['relation'] ) && strtoupper( $meta_query['relation'] ) == 'OR' ) {999 $this->relation = 'OR';1000 } else {1001 $this->relation = 'AND';1002 }1003 1004 $this->queries = $this->sanitize_query( $meta_query );1005 }1006 1007 /**1008 * Ensure the 'meta_query' argument passed to the class constructor is well-formed.1009 *1010 * Eliminates empty items and ensures that a 'relation' is set.1011 *1012 * @since 4.1.01013 * @access public1014 *1015 * @param array $queries Array of query clauses.1016 * @return array Sanitized array of query clauses.1017 */1018 public function sanitize_query( $queries ) {1019 $clean_queries = array();1020 1021 if ( ! is_array( $queries ) ) {1022 return $clean_queries;1023 }1024 1025 foreach ( $queries as $key => $query ) {1026 if ( 'relation' === $key ) {1027 $relation = $query;1028 1029 } elseif ( ! is_array( $query ) ) {1030 continue;1031 1032 // First-order clause.1033 } elseif ( $this->is_first_order_clause( $query ) ) {1034 if ( isset( $query['value'] ) && array() === $query['value'] ) {1035 unset( $query['value'] );1036 }1037 1038 $clean_queries[ $key ] = $query;1039 1040 // Otherwise, it's a nested query, so we recurse.1041 } else {1042 $cleaned_query = $this->sanitize_query( $query );1043 1044 if ( ! empty( $cleaned_query ) ) {1045 $clean_queries[ $key ] = $cleaned_query;1046 }1047 }1048 }1049 1050 if ( empty( $clean_queries ) ) {1051 return $clean_queries;1052 }1053 1054 // Sanitize the 'relation' key provided in the query.1055 if ( isset( $relation ) && 'OR' === strtoupper( $relation ) ) {1056 $clean_queries['relation'] = 'OR';1057 $this->has_or_relation = true;1058 1059 /*1060 * If there is only a single clause, call the relation 'OR'.1061 * This value will not actually be used to join clauses, but it1062 * simplifies the logic around combining key-only queries.1063 */1064 } elseif ( 1 === count( $clean_queries ) ) {1065 $clean_queries['relation'] = 'OR';1066 1067 // Default to AND.1068 } else {1069 $clean_queries['relation'] = 'AND';1070 }1071 1072 return $clean_queries;1073 }1074 1075 /**1076 * Determine whether a query clause is first-order.1077 *1078 * A first-order meta query clause is one that has either a 'key' or1079 * a 'value' array key.1080 *1081 * @since 4.1.01082 * @access protected1083 *1084 * @param array $query Meta query arguments.1085 * @return bool Whether the query clause is a first-order clause.1086 */1087 protected function is_first_order_clause( $query ) {1088 return isset( $query['key'] ) || isset( $query['value'] );1089 }1090 1091 /**1092 * Constructs a meta query based on 'meta_*' query vars1093 *1094 * @since 3.2.01095 * @access public1096 *1097 * @param array $qv The query variables1098 */1099 public function parse_query_vars( $qv ) {1100 $meta_query = array();1101 1102 /*1103 * For orderby=meta_value to work correctly, simple query needs to be1104 * first (so that its table join is against an unaliased meta table) and1105 * needs to be its own clause (so it doesn't interfere with the logic of1106 * the rest of the meta_query).1107 */1108 $primary_meta_query = array();1109 foreach ( array( 'key', 'compare', 'type' ) as $key ) {1110 if ( ! empty( $qv[ "meta_$key" ] ) ) {1111 $primary_meta_query[ $key ] = $qv[ "meta_$key" ];1112 }1113 }1114 1115 // WP_Query sets 'meta_value' = '' by default.1116 if ( isset( $qv['meta_value'] ) && '' !== $qv['meta_value'] && ( ! is_array( $qv['meta_value'] ) || $qv['meta_value'] ) ) {1117 $primary_meta_query['value'] = $qv['meta_value'];1118 }1119 1120 $existing_meta_query = isset( $qv['meta_query'] ) && is_array( $qv['meta_query'] ) ? $qv['meta_query'] : array();1121 1122 if ( ! empty( $primary_meta_query ) && ! empty( $existing_meta_query ) ) {1123 $meta_query = array(1124 'relation' => 'AND',1125 $primary_meta_query,1126 $existing_meta_query,1127 );1128 } elseif ( ! empty( $primary_meta_query ) ) {1129 $meta_query = array(1130 $primary_meta_query,1131 );1132 } elseif ( ! empty( $existing_meta_query ) ) {1133 $meta_query = $existing_meta_query;1134 }1135 1136 $this->__construct( $meta_query );1137 }1138 1139 /**1140 * Return the appropriate alias for the given meta type if applicable.1141 *1142 * @since 3.7.01143 * @access public1144 *1145 * @param string $type MySQL type to cast meta_value.1146 * @return string MySQL type.1147 */1148 public function get_cast_for_type( $type = '' ) {1149 if ( empty( $type ) )1150 return 'CHAR';1151 1152 $meta_type = strtoupper( $type );1153 1154 if ( ! preg_match( '/^(?:BINARY|CHAR|DATE|DATETIME|SIGNED|UNSIGNED|TIME|NUMERIC(?:\(\d+(?:,\s?\d+)?\))?|DECIMAL(?:\(\d+(?:,\s?\d+)?\))?)$/', $meta_type ) )1155 return 'CHAR';1156 1157 if ( 'NUMERIC' == $meta_type )1158 $meta_type = 'SIGNED';1159 1160 return $meta_type;1161 }1162 1163 /**1164 * Generates SQL clauses to be appended to a main query.1165 *1166 * @since 3.2.01167 * @access public1168 *1169 * @param string $type Type of meta, eg 'user', 'post'.1170 * @param string $primary_table Database table where the object being filtered is stored (eg wp_users).1171 * @param string $primary_id_column ID column for the filtered object in $primary_table.1172 * @param object $context Optional. The main query object.1173 * @return false|array {1174 * Array containing JOIN and WHERE SQL clauses to append to the main query.1175 *1176 * @type string $join SQL fragment to append to the main JOIN clause.1177 * @type string $where SQL fragment to append to the main WHERE clause.1178 * }1179 */1180 public function get_sql( $type, $primary_table, $primary_id_column, $context = null ) {1181 if ( ! $meta_table = _get_meta_table( $type ) ) {1182 return false;1183 }1184 1185 $this->meta_table = $meta_table;1186 $this->meta_id_column = sanitize_key( $type . '_id' );1187 1188 $this->primary_table = $primary_table;1189 $this->primary_id_column = $primary_id_column;1190 1191 $sql = $this->get_sql_clauses();1192 1193 /*1194 * If any JOINs are LEFT JOINs (as in the case of NOT EXISTS), then all JOINs should1195 * be LEFT. Otherwise posts with no metadata will be excluded from results.1196 */1197 if ( false !== strpos( $sql['join'], 'LEFT JOIN' ) ) {1198 $sql['join'] = str_replace( 'INNER JOIN', 'LEFT JOIN', $sql['join'] );1199 }1200 1201 /**1202 * Filter the meta query's generated SQL.1203 *1204 * @since 3.1.01205 *1206 * @param array $args {1207 * An array of meta query SQL arguments.1208 *1209 * @type array $clauses Array containing the query's JOIN and WHERE clauses.1210 * @type array $queries Array of meta queries.1211 * @type string $type Type of meta.1212 * @type string $primary_table Primary table.1213 * @type string $primary_id_column Primary column ID.1214 * @type object $context The main query object.1215 * }1216 */1217 return apply_filters_ref_array( 'get_meta_sql', array( $sql, $this->queries, $type, $primary_table, $primary_id_column, $context ) );1218 }1219 1220 /**1221 * Generate SQL clauses to be appended to a main query.1222 *1223 * Called by the public {@see WP_Meta_Query::get_sql()}, this method1224 * is abstracted out to maintain parity with the other Query classes.1225 *1226 * @since 4.1.01227 * @access protected1228 *1229 * @return array {1230 * Array containing JOIN and WHERE SQL clauses to append to the main query.1231 *1232 * @type string $join SQL fragment to append to the main JOIN clause.1233 * @type string $where SQL fragment to append to the main WHERE clause.1234 * }1235 */1236 protected function get_sql_clauses() {1237 /*1238 * $queries are passed by reference to get_sql_for_query() for recursion.1239 * To keep $this->queries unaltered, pass a copy.1240 */1241 $queries = $this->queries;1242 $sql = $this->get_sql_for_query( $queries );1243 1244 if ( ! empty( $sql['where'] ) ) {1245 $sql['where'] = ' AND ' . $sql['where'];1246 }1247 1248 return $sql;1249 }1250 1251 /**1252 * Generate SQL clauses for a single query array.1253 *1254 * If nested subqueries are found, this method recurses the tree to1255 * produce the properly nested SQL.1256 *1257 * @since 4.1.01258 * @access protected1259 *1260 * @param array $query Query to parse, passed by reference.1261 * @param int $depth Optional. Number of tree levels deep we currently are.1262 * Used to calculate indentation. Default 0.1263 * @return array {1264 * Array containing JOIN and WHERE SQL clauses to append to a single query array.1265 *1266 * @type string $join SQL fragment to append to the main JOIN clause.1267 * @type string $where SQL fragment to append to the main WHERE clause.1268 * }1269 */1270 protected function get_sql_for_query( &$query, $depth = 0 ) {1271 $sql_chunks = array(1272 'join' => array(),1273 'where' => array(),1274 );1275 1276 $sql = array(1277 'join' => '',1278 'where' => '',1279 );1280 1281 $indent = '';1282 for ( $i = 0; $i < $depth; $i++ ) {1283 $indent .= " ";1284 }1285 1286 foreach ( $query as $key => &$clause ) {1287 if ( 'relation' === $key ) {1288 $relation = $query['relation'];1289 } elseif ( is_array( $clause ) ) {1290 1291 // This is a first-order clause.1292 if ( $this->is_first_order_clause( $clause ) ) {1293 $clause_sql = $this->get_sql_for_clause( $clause, $query, $key );1294 1295 $where_count = count( $clause_sql['where'] );1296 if ( ! $where_count ) {1297 $sql_chunks['where'][] = '';1298 } elseif ( 1 === $where_count ) {1299 $sql_chunks['where'][] = $clause_sql['where'][0];1300 } else {1301 $sql_chunks['where'][] = '( ' . implode( ' AND ', $clause_sql['where'] ) . ' )';1302 }1303 1304 $sql_chunks['join'] = array_merge( $sql_chunks['join'], $clause_sql['join'] );1305 // This is a subquery, so we recurse.1306 } else {1307 $clause_sql = $this->get_sql_for_query( $clause, $depth + 1 );1308 1309 $sql_chunks['where'][] = $clause_sql['where'];1310 $sql_chunks['join'][] = $clause_sql['join'];1311 }1312 }1313 }1314 1315 // Filter to remove empties.1316 $sql_chunks['join'] = array_filter( $sql_chunks['join'] );1317 $sql_chunks['where'] = array_filter( $sql_chunks['where'] );1318 1319 if ( empty( $relation ) ) {1320 $relation = 'AND';1321 }1322 1323 // Filter duplicate JOIN clauses and combine into a single string.1324 if ( ! empty( $sql_chunks['join'] ) ) {1325 $sql['join'] = implode( ' ', array_unique( $sql_chunks['join'] ) );1326 }1327 1328 // Generate a single WHERE clause with proper brackets and indentation.1329 if ( ! empty( $sql_chunks['where'] ) ) {1330 $sql['where'] = '( ' . "\n " . $indent . implode( ' ' . "\n " . $indent . $relation . ' ' . "\n " . $indent, $sql_chunks['where'] ) . "\n" . $indent . ')';1331 }1332 1333 return $sql;1334 }1335 1336 /**1337 * Generate SQL JOIN and WHERE clauses for a first-order query clause.1338 *1339 * "First-order" means that it's an array with a 'key' or 'value'.1340 *1341 * @since 4.1.01342 * @access public1343 *1344 * @global wpdb $wpdb1345 *1346 * @param array $clause Query clause, passed by reference.1347 * @param array $parent_query Parent query array.1348 * @param string $clause_key Optional. The array key used to name the clause in the original `$meta_query`1349 * parameters. If not provided, a key will be generated automatically.1350 * @return array {1351 * Array containing JOIN and WHERE SQL clauses to append to a first-order query.1352 *1353 * @type string $join SQL fragment to append to the main JOIN clause.1354 * @type string $where SQL fragment to append to the main WHERE clause.1355 * }1356 */1357 public function get_sql_for_clause( &$clause, $parent_query, $clause_key = '' ) {1358 global $wpdb;1359 1360 $sql_chunks = array(1361 'where' => array(),1362 'join' => array(),1363 );1364 1365 if ( isset( $clause['compare'] ) ) {1366 $clause['compare'] = strtoupper( $clause['compare'] );1367 } else {1368 $clause['compare'] = isset( $clause['value'] ) && is_array( $clause['value'] ) ? 'IN' : '=';1369 }1370 1371 if ( ! in_array( $clause['compare'], array(1372 '=', '!=', '>', '>=', '<', '<=',1373 'LIKE', 'NOT LIKE',1374 'IN', 'NOT IN',1375 'BETWEEN', 'NOT BETWEEN',1376 'EXISTS', 'NOT EXISTS',1377 'REGEXP', 'NOT REGEXP', 'RLIKE'1378 ) ) ) {1379 $clause['compare'] = '=';1380 }1381 1382 $meta_compare = $clause['compare'];1383 1384 // First build the JOIN clause, if one is required.1385 $join = '';1386 1387 // We prefer to avoid joins if possible. Look for an existing join compatible with this clause.1388 $alias = $this->find_compatible_table_alias( $clause, $parent_query );1389 if ( false === $alias ) {1390 $i = count( $this->table_aliases );1391 $alias = $i ? 'mt' . $i : $this->meta_table;1392 1393 // JOIN clauses for NOT EXISTS have their own syntax.1394 if ( 'NOT EXISTS' === $meta_compare ) {1395 $join .= " LEFT JOIN $this->meta_table";1396 $join .= $i ? " AS $alias" : '';1397 $join .= $wpdb->prepare( " ON ($this->primary_table.$this->primary_id_column = $alias.$this->meta_id_column AND $alias.meta_key = %s )", $clause['key'] );1398 1399 // All other JOIN clauses.1400 } else {1401 $join .= " INNER JOIN $this->meta_table";1402 $join .= $i ? " AS $alias" : '';1403 $join .= " ON ( $this->primary_table.$this->primary_id_column = $alias.$this->meta_id_column )";1404 }1405 1406 $this->table_aliases[] = $alias;1407 $sql_chunks['join'][] = $join;1408 }1409 1410 // Save the alias to this clause, for future siblings to find.1411 $clause['alias'] = $alias;1412 1413 // Determine the data type.1414 $_meta_type = isset( $clause['type'] ) ? $clause['type'] : '';1415 $meta_type = $this->get_cast_for_type( $_meta_type );1416 $clause['cast'] = $meta_type;1417 1418 // Fallback for clause keys is the table alias.1419 if ( ! $clause_key ) {1420 $clause_key = $clause['alias'];1421 }1422 1423 // Ensure unique clause keys, so none are overwritten.1424 $iterator = 1;1425 $clause_key_base = $clause_key;1426 while ( isset( $this->clauses[ $clause_key ] ) ) {1427 $clause_key = $clause_key_base . '-' . $iterator;1428 $iterator++;1429 }1430 1431 // Store the clause in our flat array.1432 $this->clauses[ $clause_key ] =& $clause;1433 1434 // Next, build the WHERE clause.1435 1436 // meta_key.1437 if ( array_key_exists( 'key', $clause ) ) {1438 if ( 'NOT EXISTS' === $meta_compare ) {1439 $sql_chunks['where'][] = $alias . '.' . $this->meta_id_column . ' IS NULL';1440 } else {1441 $sql_chunks['where'][] = $wpdb->prepare( "$alias.meta_key = %s", trim( $clause['key'] ) );1442 }1443 }1444 1445 // meta_value.1446 if ( array_key_exists( 'value', $clause ) ) {1447 $meta_value = $clause['value'];1448 1449 if ( in_array( $meta_compare, array( 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' ) ) ) {1450 if ( ! is_array( $meta_value ) ) {1451 $meta_value = preg_split( '/[,\s]+/', $meta_value );1452 }1453 } else {1454 $meta_value = trim( $meta_value );1455 }1456 1457 switch ( $meta_compare ) {1458 case 'IN' :1459 case 'NOT IN' :1460 $meta_compare_string = '(' . substr( str_repeat( ',%s', count( $meta_value ) ), 1 ) . ')';1461 $where = $wpdb->prepare( $meta_compare_string, $meta_value );1462 break;1463 1464 case 'BETWEEN' :1465 case 'NOT BETWEEN' :1466 $meta_value = array_slice( $meta_value, 0, 2 );1467 $where = $wpdb->prepare( '%s AND %s', $meta_value );1468 break;1469 1470 case 'LIKE' :1471 case 'NOT LIKE' :1472 $meta_value = '%' . $wpdb->esc_like( $meta_value ) . '%';1473 $where = $wpdb->prepare( '%s', $meta_value );1474 break;1475 1476 // EXISTS with a value is interpreted as '='.1477 case 'EXISTS' :1478 $meta_compare = '=';1479 $where = $wpdb->prepare( '%s', $meta_value );1480 break;1481 1482 // 'value' is ignored for NOT EXISTS.1483 case 'NOT EXISTS' :1484 $where = '';1485 break;1486 1487 default :1488 $where = $wpdb->prepare( '%s', $meta_value );1489 break;1490 1491 }1492 1493 if ( $where ) {1494 $sql_chunks['where'][] = "CAST($alias.meta_value AS {$meta_type}) {$meta_compare} {$where}";1495 }1496 }1497 1498 /*1499 * Multiple WHERE clauses (for meta_key and meta_value) should1500 * be joined in parentheses.1501 */1502 if ( 1 < count( $sql_chunks['where'] ) ) {1503 $sql_chunks['where'] = array( '( ' . implode( ' AND ', $sql_chunks['where'] ) . ' )' );1504 }1505 1506 return $sql_chunks;1507 }1508 1509 /**1510 * Get a flattened list of sanitized meta clauses.1511 *1512 * This array should be used for clause lookup, as when the table alias and CAST type must be determined for1513 * a value of 'orderby' corresponding to a meta clause.1514 *1515 * @since 4.2.01516 * @access public1517 *1518 * @return array Meta clauses.1519 */1520 public function get_clauses() {1521 return $this->clauses;1522 }1523 1524 /**1525 * Identify an existing table alias that is compatible with the current1526 * query clause.1527 *1528 * We avoid unnecessary table joins by allowing each clause to look for1529 * an existing table alias that is compatible with the query that it1530 * needs to perform.1531 *1532 * An existing alias is compatible if (a) it is a sibling of `$clause`1533 * (ie, it's under the scope of the same relation), and (b) the combination1534 * of operator and relation between the clauses allows for a shared table join.1535 * In the case of {@see WP_Meta_Query}, this only applies to 'IN' clauses that1536 * are connected by the relation 'OR'.1537 *1538 * @since 4.1.01539 * @access protected1540 *1541 * @param array $clause Query clause.1542 * @param array $parent_query Parent query of $clause.1543 * @return string|bool Table alias if found, otherwise false.1544 */1545 protected function find_compatible_table_alias( $clause, $parent_query ) {1546 $alias = false;1547 1548 foreach ( $parent_query as $sibling ) {1549 // If the sibling has no alias yet, there's nothing to check.1550 if ( empty( $sibling['alias'] ) ) {1551 continue;1552 }1553 1554 // We're only interested in siblings that are first-order clauses.1555 if ( ! is_array( $sibling ) || ! $this->is_first_order_clause( $sibling ) ) {1556 continue;1557 }1558 1559 $compatible_compares = array();1560 1561 // Clauses connected by OR can share joins as long as they have "positive" operators.1562 if ( 'OR' === $parent_query['relation'] ) {1563 $compatible_compares = array( '=', 'IN', 'BETWEEN', 'LIKE', 'REGEXP', 'RLIKE', '>', '>=', '<', '<=' );1564 1565 // Clauses joined by AND with "negative" operators share a join only if they also share a key.1566 } elseif ( isset( $sibling['key'] ) && isset( $clause['key'] ) && $sibling['key'] === $clause['key'] ) {1567 $compatible_compares = array( '!=', 'NOT IN', 'NOT LIKE' );1568 }1569 1570 $clause_compare = strtoupper( $clause['compare'] );1571 $sibling_compare = strtoupper( $sibling['compare'] );1572 if ( in_array( $clause_compare, $compatible_compares ) && in_array( $sibling_compare, $compatible_compares ) ) {1573 $alias = $sibling['alias'];1574 break;1575 }1576 }1577 1578 /**1579 * Filter the table alias identified as compatible with the current clause.1580 *1581 * @since 4.1.01582 *1583 * @param string|bool $alias Table alias, or false if none was found.1584 * @param array $clause First-order query clause.1585 * @param array $parent_query Parent of $clause.1586 * @param object $this WP_Meta_Query object.1587 */1588 return apply_filters( 'meta_query_find_compatible_table_alias', $alias, $clause, $parent_query, $this ) ;1589 }1590 1591 /**1592 * Checks whether the current query has any OR relations.1593 *1594 * In some cases, the presence of an OR relation somewhere in the query will require1595 * the use of a `DISTINCT` or `GROUP BY` keyword in the `SELECT` clause. The current1596 * method can be used in these cases to determine whether such a clause is necessary.1597 *1598 * @since 4.3.01599 *1600 * @return bool True if the query contains any `OR` relations, otherwise false.1601 */1602 public function has_or_relation() {1603 return $this->has_or_relation;1604 }1605 }1606 1607 /**1608 872 * Retrieve the name of the metadata table for the specified object type. 1609 873 *
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