return '(' . implode( $glue, $sqls ) . ')';
}
+ public function unionConditionPermutations(
+ $table, $vars, array $permute_conds, $extra_conds = '', $fname = __METHOD__,
+ $options = [], $join_conds = []
+ ) {
+ // First, build the Cartesian product of $permute_conds
+ $conds = [ [] ];
+ foreach ( $permute_conds as $field => $values ) {
+ if ( !$values ) {
+ // Skip empty $values
+ continue;
+ }
+ $values = array_unique( $values ); // For sanity
+ $newConds = [];
+ foreach ( $conds as $cond ) {
+ foreach ( $values as $value ) {
+ $cond[$field] = $value;
+ $newConds[] = $cond; // Arrays are by-value, not by-reference, so this works
+ }
+ }
+ $conds = $newConds;
+ }
+
+ $extra_conds = $extra_conds === '' ? [] : (array)$extra_conds;
+
+ // If there's just one condition and no subordering, hand off to
+ // selectSQLText directly.
+ if ( count( $conds ) === 1 &&
+ ( !isset( $options['INNER ORDER BY'] ) || !$this->unionSupportsOrderAndLimit() )
+ ) {
+ return $this->selectSQLText(
+ $table, $vars, $conds[0] + $extra_conds, $fname, $options, $join_conds
+ );
+ }
+
+ // Otherwise, we need to pull out the order and limit to apply after
+ // the union. Then build the SQL queries for each set of conditions in
+ // $conds. Then union them together (using UNION ALL, because the
+ // product *should* already be distinct).
+ $orderBy = $this->makeOrderBy( $options );
+ $limit = isset( $options['LIMIT'] ) ? $options['LIMIT'] : null;
+ $offset = isset( $options['OFFSET'] ) ? $options['OFFSET'] : false;
+ $all = empty( $options['NOTALL'] ) && !in_array( 'NOTALL', $options );
+ if ( !$this->unionSupportsOrderAndLimit() ) {
+ unset( $options['ORDER BY'], $options['LIMIT'], $options['OFFSET'] );
+ } else {
+ if ( array_key_exists( 'INNER ORDER BY', $options ) ) {
+ $options['ORDER BY'] = $options['INNER ORDER BY'];
+ }
+ if ( $limit !== null && is_numeric( $offset ) && $offset != 0 ) {
+ // We need to increase the limit by the offset rather than
+ // using the offset directly, otherwise it'll skip incorrectly
+ // in the subqueries.
+ $options['LIMIT'] = $limit + $offset;
+ unset( $options['OFFSET'] );
+ }
+ }
+
+ $sqls = [];
+ foreach ( $conds as $cond ) {
+ $sqls[] = $this->selectSQLText(
+ $table, $vars, $cond + $extra_conds, $fname, $options, $join_conds
+ );
+ }
+ $sql = $this->unionQueries( $sqls, $all ) . $orderBy;
+ if ( $limit !== null ) {
+ $sql = $this->limitResult( $sql, $limit, $offset );
+ }
+
+ return $sql;
+ }
+
public function conditional( $cond, $trueVal, $falseVal ) {
if ( is_array( $cond ) ) {
$cond = $this->makeList( $cond, self::LIST_AND );