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<?php
declare(strict_types=1);
namespace Level23\Druid\Filters;
use Level23\Druid\Extractions\ExtractionInterface;
/**
* Class NullFilter
*
* @see https://druid.apache.org/docs/latest/querying/filters#null-filter
* @package Level23\Druid\Filters
*/
class NullFilter implements FilterInterface
{
protected string $column;
protected ?ExtractionInterface $extractionFunction;
* NullFilter constructor.
* @param string $column Input column or virtual column name to filter.
public function __construct(string $column)
$this->column = $column;
}
* Return the filter as it can be used in the druid query.
* @return array<string,string|array<string,string|int|bool|array<mixed>>>
public function toArray(): array
$result = [
'type' => 'null',
'column' => $this->column,
];
return $result;
level23 /
druid-client
