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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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class DoublesSketchAggregator implements AggregatorInterface |
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{ |
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/** |
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* A String for the name of the input field (can contain sketches or raw numeric values). |
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* |
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* @var string |
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*/ |
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protected $metricName; |
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/** |
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* A String for the output (result) name of the calculation. |
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* |
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* @var string |
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*/ |
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protected $outputName; |
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/** |
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* Parameter that determines the accuracy and size of the sketch. Higher k means higher accuracy but more space to |
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* store sketches. Must be a power of 2 from 2 to 32768. See accuracy information in the DataSketches documentation |
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* for details. |
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* |
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* @var int|null |
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*/ |
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protected $sizeAndAccuracy; |
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/** |
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* This parameter is a temporary solution to avoid a known issue. It may be removed in a future release after the |
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* bug is fixed. This parameter defines the maximum number of items to store in each sketch. If a sketch reaches |
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* the limit, the query can throw IllegalStateException. To workaround this issue, increase the maximum stream |
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* length. See accuracy information in the DataSketches documentation for how many bytes are required per stream |
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* length. |
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* |
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* @var int|null |
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*/ |
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protected $maxStreamLength; |
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/** |
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* @param string $metricName A String for the name of the input field (can contain sketches or raw numeric |
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* values). |
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* @param string $outputName A String for the output (result) name of the calculation. |
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* @param int|null $sizeAndAccuracy Parameter that determines the accuracy and size of the sketch. Higher k means |
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* higher accuracy but more space to store sketches. Must be a power of 2 from 2 |
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* to 32768. See accuracy information in the DataSketches documentation for |
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* details. |
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* @param int|null $maxStreamLength This parameter is a temporary solution to avoid a known issue. It may be |
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* removed in a future release after the bug is fixed. This parameter defines the |
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* maximum number of items to store in each sketch. If a sketch reaches the limit, |
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* the query can throw IllegalStateException. To workaround this issue, increase |
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* the maximum stream length. See accuracy information in the DataSketches |
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* documentation for how many bytes are required per stream length. |
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* |
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* @see https://druid.apache.org/docs/latest/development/extensions-core/datasketches-quantiles.html |
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*/ |
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public function __construct( |
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string $metricName, |
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string $outputName = '', |
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?int $sizeAndAccuracy = null, |
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?int $maxStreamLength = null |
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) { |
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$this->metricName = $metricName; |
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$this->outputName = $outputName ?: $metricName; |
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$this->sizeAndAccuracy = $sizeAndAccuracy; |
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$this->maxStreamLength = $maxStreamLength; |
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} |
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public function toArray(): array |
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{ |
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$result = [ |
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'type' => 'quantilesDoublesSketch', |
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'name' => $this->outputName, |
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'fieldName' => $this->metricName, |
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]; |
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if ($this->sizeAndAccuracy !== null) { |
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$result['k'] = $this->sizeAndAccuracy; |
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} |
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if ($this->maxStreamLength !== null) { |
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$result['maxStreamLength'] = $this->maxStreamLength; |
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} |
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return $result; |
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} |
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} |
level23 /
druid-client
