GroupByClause.php

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<?php

namespace Elgg\Database\Clauses;

use Doctrine\DBAL\Query\Expression\CompositeExpression;
use Elgg\Database\QueryBuilder;

class GroupByClause extends Clause {

    public $expr;

    public function __construct($expr) {
        $this->expr = $expr;
    }

    public function prepare(QueryBuilder $qb, $table_alias = null) {
        $group_by = $this->expr;

        if ($this->isCallable($group_by)) {
            $group_by = $this->call($group_by, $qb, $table_alias);
        }

        if ($group_by instanceof CompositeExpression || is_string($group_by)) {
            $qb->addGroupBy($group_by);
        }
    }
}