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<?php |
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declare(strict_types=1); |
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namespace Level23\Druid\Aggregations; |
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use Level23\Druid\Filters\FilterInterface; |
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/** |
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* Class FilteredAggregator |
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* |
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* A filtered aggregator wraps any given aggregator, |
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* but only aggregates the values for which the given dimension filter matches. |
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* |
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* This makes it possible to compute the results of a filtered and an unfiltered |
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* aggregation simultaneously, without having to issue multiple queries, |
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* and use both results as part of post-aggregations. |
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* |
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* Note: If only the filtered results are required, |
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* consider putting the filter on the query itself, which will be much faster since |
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* it does not require scanning all the data. |
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* |
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* @package Level23\Druid\Aggregations |
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*/ |
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class FilteredAggregator implements AggregatorInterface |
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{ |
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protected AggregatorInterface $aggregator; |
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protected FilterInterface $filter; |
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/** |
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* CountAggregator constructor. |
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* |
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* @param \Level23\Druid\Filters\FilterInterface $filter |
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* @param \Level23\Druid\Aggregations\AggregatorInterface $aggregator |
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*/ |
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public function __construct(FilterInterface $filter, AggregatorInterface $aggregator) |
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{ |
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$this->filter = $filter; |
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$this->aggregator = $aggregator; |
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} |
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/** |
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* Return the aggregator as it can be used in a druid query. |
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* |
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* @return array<string,string|array<mixed>> |
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*/ |
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public function toArray(): array |
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{ |
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return [ |
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'type' => 'filtered', |
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'filter' => $this->filter->toArray(), |
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'aggregator' => $this->aggregator->toArray(), |
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]; |
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} |
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} |
level23 /
druid-client
