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<?php
declare(strict_types=1);
namespace Level23\Druid\Concerns;
use Level23\Druid\Types\DataType;
use Level23\Druid\VirtualColumns\VirtualColumn;
trait HasVirtualColumns
{
/**
* @var array|\Level23\Druid\VirtualColumns\VirtualColumnInterface[]
*/
protected $virtualColumns = [];
* Create a virtual column.
*
* Virtual columns are queryable column "views" created from a set of columns during a query.
* A virtual column can potentially draw from multiple underlying columns, although a virtual column always
* presents itself as a single column.
* Virtual columns can be used as dimensions or as inputs to aggregators.
* NOTE: virtual columns are NOT automatically added to your output. You should select it separately if you want to
* add it also to your output. Use selectVirtual to do both at once.
* @param string $expression
* @param string $as
* @param string $outputType
* @return $this
* @see https://druid.apache.org/docs/latest/misc/math-expr.html
public function virtualColumn(string $expression, string $as, $outputType = DataType::STRING)
$this->virtualColumns[] = new VirtualColumn($expression, $as, $outputType);
return $this;
}
level23 /
druid-client
