public function walkIdentificationVariableDeclaration($identificationVariableDecl)
    {
        $sql = $this->walkRangeVariableDeclaration($identificationVariableDecl->rangeVariableDeclaration);

        if ($identificationVariableDecl->indexBy) {
            $this->walkIndexBy($identificationVariableDecl->indexBy);
        }

        foreach ($identificationVariableDecl->joins as $join) {
            $sql .= $this->walkJoin($join);
        }

        return $sql;
    }