/**
* Walks down a SelectExpression AST node and generates the corresponding SQL.
*
* @param SelectExpression $selectExpression
*
* @return string The SQL.
*/
public function walkSelectExpression($selectExpression)
{
$expr = $selectExpression->expression;
$sql = parent::walkSelectExpression($selectExpression);
if ($expr instanceof ReturnsGeometryInterface && !$selectExpression->hiddenAliasResultVariable) {
$alias = trim(strrchr($sql, ' '));
$this->rsm->typeMappings[$alias] = 'geometry';
}
return $sql;
}
