SelectClause.php

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<?php
 
namespace Elgg\Database\Clauses;
 
use Doctrine\DBAL\Query\Expression\CompositeExpression;
use Elgg\Database\QueryBuilder;
 
class SelectClause extends Clause {
 
    public $expr;
 
    public function __construct($expr) {
        $this->expr = $expr;
    }
 
    public function prepare(QueryBuilder $qb, $table_alias = null) {
        $select = $this->expr;
 
        if ($this->isCallable($select)) {
            $select = $this->call($this->expr, $qb, $table_alias);
        }
 
        if ($select instanceof CompositeExpression || is_string($select)) {
            $qb->addSelect($select);
        }
    }
}