public function getResultSpecifier()
{
$resultSpecifier = new ResultSpecifier();
$resultColumn = new ResultColumnSpecifier();
foreach ($this->getColumns() as $alias => $column) {
switch (true) {
case $column instanceof Column:
$resultColumn->setSchemaSourceColumn($column);
$resultColumn->setName($column->getColumn());
break;
case $column === '*':
$resultColumn->setSchemaSourceJoker();
$resultColumn->setIsAllColumnsFromTable(true);
break;
case $column instanceof Table:
$resultColumn->setSchemaSourceTable($column);
$resultColumn->setIsAllColumnsFromTable(true);
break;
case $column instanceof Select:
$Specifier = $column->getResultSpecifier();
if (count($Specifier->getColumns()) !== 1) {
throw new MalformedSqlException("Wrong column count in sub-select!");
}
$resultColumn = reset($Specifier->getColumns());
break;
case $column instanceof ValuePart:
$resultColumn->setSchemaSourceValue($column);
break;
}
if (is_string($alias)) {
$resultColumn->setName($alias);
}
$resultSpecifier->addColumn(clone $resultColumn);
}
return $resultSpecifier;
}
