public function applySelect(SelectQuery $query, SortClause $sortClause, $number)
{
$query->select($query->alias($query->expr->not($query->expr->isNull($this->dbHandler->quoteColumn('sort_key_int', $this->getSortTableName($number)))), $column1 = $this->getSortColumnName($number . '_null')), $query->alias($query->expr->not($query->expr->isNull($this->dbHandler->quoteColumn('sort_key_string', $this->getSortTableName($number)))), $column2 = $this->getSortColumnName($number . '_bis_null')), $query->alias($this->dbHandler->quoteColumn('sort_key_int', $this->getSortTableName($number)), $column3 = $this->getSortColumnName($number)), $query->alias($this->dbHandler->quoteColumn('sort_key_string', $this->getSortTableName($number)), $column4 = $this->getSortColumnName($number . '_bis')));
return array($column1, $column2, $column3, $column4);
}