Make WordPress Core


Ignore:
Timestamp:
08/26/2015 01:01:22 PM (9 years ago)
Author:
wonderboymusic
Message:

Meta: move WP_Meta_Query into its own file. meta.php loads the new files, so this is 100% BC if someone is loading meta.php directly. New files created using svn cp.

Creates:
class-wp-meta-query.php
meta-functions.php

meta.php contains only top-level code. Class file only contains the class. Functions file only contains functions.

See #33413.

File:
1 copied

Legend:

Unmodified
Added
Removed
  • trunk/src/wp-includes/meta-functions.php

    r33758 r33761  
    870870
    871871/**
    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 attached
    876  * to the primary SQL query string.
    877  *
    878  * @since 3.2.0
    879  */
    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 3.2.0
    887      * @access public
    888      * @var array
    889      */
    890     public $queries = array();
    891 
    892     /**
    893      * The relation between the queries. Can be one of 'AND' or 'OR'.
    894      *
    895      * @since 3.2.0
    896      * @access public
    897      * @var string
    898      */
    899     public $relation;
    900 
    901     /**
    902      * Database table to query for the metadata.
    903      *
    904      * @since 4.1.0
    905      * @access public
    906      * @var string
    907      */
    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 4.1.0
    914      * @access public
    915      * @var string
    916      */
    917     public $meta_id_column;
    918 
    919     /**
    920      * Database table that where the metadata's objects are stored (eg $wpdb->users).
    921      *
    922      * @since 4.1.0
    923      * @access public
    924      * @var string
    925      */
    926     public $primary_table;
    927 
    928     /**
    929      * Column in primary_table that represents the ID of the object.
    930      *
    931      * @since 4.1.0
    932      * @access public
    933      * @var string
    934      */
    935     public $primary_id_column;
    936 
    937     /**
    938      * A flat list of table aliases used in JOIN clauses.
    939      *
    940      * @since 4.1.0
    941      * @access protected
    942      * @var array
    943      */
    944     protected $table_aliases = array();
    945 
    946     /**
    947      * A flat list of clauses, keyed by clause 'name'.
    948      *
    949      * @since 4.2.0
    950      * @access protected
    951      * @var array
    952      */
    953     protected $clauses = array();
    954 
    955     /**
    956      * Whether the query contains any OR relations.
    957      *
    958      * @since 4.3.0
    959      * @access protected
    960      * @var bool
    961      */
    962     protected $has_or_relation = false;
    963 
    964     /**
    965      * Constructor.
    966      *
    967      * @since 3.2.0
    968      * @since 4.2.0 Introduced support for naming query clauses by associative array keys.
    969      *
    970      * @access public
    971      *
    972      * @param array $meta_query {
    973      *     Array of meta query clauses. When first-order clauses use strings as their array keys, they may be
    974      *     referenced in the 'orderby' parameter of the parent query.
    975      *
    976      *     @type string $relation Optional. The MySQL keyword used to join
    977      *                            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 for
    988      *                               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 4.1.0
    1013      * @access public
    1014      *
    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 it
    1062          * 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' or
    1079      * a 'value' array key.
    1080      *
    1081      * @since 4.1.0
    1082      * @access protected
    1083      *
    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 vars
    1093      *
    1094      * @since 3.2.0
    1095      * @access public
    1096      *
    1097      * @param array $qv The query variables
    1098      */
    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 be
    1104          * first (so that its table join is against an unaliased meta table) and
    1105          * needs to be its own clause (so it doesn't interfere with the logic of
    1106          * 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 3.7.0
    1143      * @access public
    1144      *
    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 3.2.0
    1167      * @access public
    1168      *
    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 should
    1195          * 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 3.1.0
    1205          *
    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 method
    1224      * is abstracted out to maintain parity with the other Query classes.
    1225      *
    1226      * @since 4.1.0
    1227      * @access protected
    1228      *
    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 to
    1255      * produce the properly nested SQL.
    1256      *
    1257      * @since 4.1.0
    1258      * @access protected
    1259      *
    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 4.1.0
    1342      * @access public
    1343      *
    1344      * @global wpdb $wpdb
    1345      *
    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) should
    1500          * 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 for
    1513      * a value of 'orderby' corresponding to a meta clause.
    1514      *
    1515      * @since 4.2.0
    1516      * @access public
    1517      *
    1518      * @return array Meta clauses.
    1519      */
    1520     public function get_clauses() {
    1521         return $this->clauses;
    1522     }
    1523 
    1524     /**
    1525      * Identify an existing table alias that is compatible with the current
    1526      * query clause.
    1527      *
    1528      * We avoid unnecessary table joins by allowing each clause to look for
    1529      * an existing table alias that is compatible with the query that it
    1530      * needs to perform.
    1531      *
    1532      * An existing alias is compatible if (a) it is a sibling of `$clause`
    1533      * (ie, it's under the scope of the same relation), and (b) the combination
    1534      * 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 that
    1536      * are connected by the relation 'OR'.
    1537      *
    1538      * @since 4.1.0
    1539      * @access protected
    1540      *
    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 4.1.0
    1582          *
    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 require
    1595      * the use of a `DISTINCT` or `GROUP BY` keyword in the `SELECT` clause. The current
    1596      * method can be used in these cases to determine whether such a clause is necessary.
    1597      *
    1598      * @since 4.3.0
    1599      *
    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 /**
    1608872 * Retrieve the name of the metadata table for the specified object type.
    1609873 *
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