HasAggregations::doublesSketch() - Code Metrics - Inspection of "Implemented DataSketches methods." - level23/druid-client - Measure and Improve Code Quality continuously with Scrutinizer

Passed
Pull Request — master (#35)

by Teye
created 2022-04-09 09:20 UTC
HasAggregations::doublesSketch() A

↳ Parent: HasAggregations
Complexity

Conditions	2
Paths	1
Size

Total Lines	14
Code Lines	6
Duplication

Lines	0
Ratio	0 %
Code Coverage

Tests	4
CRAP Score	2
Importance

Changes
Metric	Value
eloc	6
c	0
b	0
f	0
dl	0
loc	14
ccs	4
cts	4
cp	1
rs	10
cc	2
nc	1
nop	4
crap	2
<?php
declare(strict_types=1);

namespace Level23\Druid\Concerns;

use Closure;
use InvalidArgumentException;
use Level23\Druid\Types\DataType;
use Level23\Druid\Dimensions\Dimension;
use Level23\Druid\Filters\FilterBuilder;
use Level23\Druid\Filters\FilterInterface;
use Level23\Druid\Aggregations\MaxAggregator;
use Level23\Druid\Aggregations\MinAggregator;
use Level23\Druid\Aggregations\SumAggregator;
use Level23\Druid\Aggregations\AnyAggregator;
use Level23\Druid\Aggregations\LastAggregator;
use Level23\Druid\Dimensions\DimensionBuilder;
use Level23\Druid\Aggregations\CountAggregator;
use Level23\Druid\Aggregations\FirstAggregator;
use Level23\Druid\Aggregations\FilteredAggregator;
use Level23\Druid\Collections\DimensionCollection;
use Level23\Druid\Aggregations\AggregatorInterface;
use Level23\Druid\Aggregations\JavascriptAggregator;
use Level23\Druid\Aggregations\HyperUniqueAggregator;
use Level23\Druid\Aggregations\CardinalityAggregator;
use Level23\Druid\Aggregations\DoublesSketchAggregator;
use Level23\Druid\Aggregations\DistinctCountAggregator;

trait HasAggregations
{
    /**
     * @var \Level23\Druid\DruidClient
     */
    protected $client;

    /**
     * @var null|\Level23\Druid\Queries\QueryBuilder
     */
    protected $query;

    /**
     * @var array|\Level23\Druid\Aggregations\AggregatorInterface[]
     */
    protected $aggregations = [];

    /**
     * @return array|\Level23\Druid\Aggregations\AggregatorInterface[]
     */
    public function getAggregations(): array
    {
        return $this->aggregations;
    }

    /**
     * Sum the given metric
     *
     * @param string        $metric
     * @param string        $as
     * @param string        $type
     * @param \Closure|null $filterBuilder   A closure which receives a FilterBuilder. When given, we will only apply
     *                                       the "sum" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function sum(string $metric, string $as = '', string $type = DataType::LONG, Closure $filterBuilder = null)
    {
        $this->aggregations[] = $this->buildFilteredAggregation(
            new SumAggregator($metric, $as, $type),
            $filterBuilder
        );

        return $this;
    }

    /**
     * DoublesSketch is a mergeable streaming algorithm to estimate the distribution of values, and approximately
     * answer queries about the rank of a value, probability mass function of the distribution (PMF) or histogram,
     * cumulative distribution function (CDF), and quantiles (median, min, max, 95th percentile and such). See
     * Quantiles Sketch Overview.
     *s
     * To make use of this aggregator you have to have the datasketches module enabled in your druid server:
     * druid.extensions.loadList=["druid-datasketches"]
     *
     *
     * @param string   $metric          A String for the name of the input field (can contain sketches or raw numeric
     *                                  values).
     * @param string   $as              A String for the output (result) name of the calculation.
     * @param int|null $sizeAndAccuracy Parameter that determines the accuracy and size of the sketch. Higher k means
     *                                  higher accuracy but more space to store sketches. Must be a power of 2 from 2
     *                                  to 32768. See accuracy information in the DataSketches documentation for
     *                                  details.
     * @param int|null $maxStreamLength This parameter is a temporary solution to avoid a known issue. It may be
     *                                  removed in a future release after the bug is fixed. This parameter defines the
     *                                  maximum number of items to store in each sketch. If a sketch reaches the limit,
     *                                  the query can throw IllegalStateException. To workaround this issue, increase
     *                                  the maximum stream length. See accuracy information in the DataSketches
     *                                  documentation for how many bytes are required per stream length.
     *
     * @return $this
     */
    public function doublesSketch(
        string $metric,
        string $as = '',
        ?int $sizeAndAccuracy = null,
        ?int $maxStreamLength = null
    ): self {
        $this->aggregations[] = new DoublesSketchAggregator(
            $metric,
            $as ?: $metric,
            $sizeAndAccuracy,
            $maxStreamLength
        );

        return $this;
    }

    /**
     * Shorthand for summing long's
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder   A closure which receives a FilterBuilder. When given, we will only apply
     *                                       the "sum" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function longSum(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->sum($metric, $as, DataType::LONG, $filterBuilder);
    }

    /**
     * Shorthand for summing doubles
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder   A closure which receives a FilterBuilder. When given, we will only apply
     *                                       the "sum" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function doubleSum(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->sum($metric, $as, DataType::DOUBLE, $filterBuilder);
    }

    /**
     * Shorthand for summing floats
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder   A closure which receives a FilterBuilder. When given, we will only apply
     *                                       the "sum" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function floatSum(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->sum($metric, $as, DataType::FLOAT, $filterBuilder);
    }

    /**
     * Uses HyperLogLog to compute the estimated cardinality of a dimension that has been aggregated as a "hyperUnique"
     * metric at indexing time.
     *
     * @see http://algo.inria.fr/flajolet/Publications/FlFuGaMe07.pdf
     *
     * @param string $metric
     * @param string $as
     * @param bool   $round              Only affects query-time behavior, and is ignored at ingestion-time. The
     *                                   HyperLogLog algorithm generates decimal estimates with some error. "round" can
     *                                   be set to true to round off estimated values to whole numbers. Note that even
     *                                   with rounding, the cardinality is still an estimate.
     * @param bool   $isInputHyperUnique Only affects ingestion-time behavior, and is ignored at query-time. Set to
     *                                   true to index pre-computed HLL (Base64 encoded output from druid-hll is
     *                                   expected).
     *
     * @return $this
     */
    public function hyperUnique(string $metric, string $as, bool $round = false, bool $isInputHyperUnique = false)
    {
        $this->aggregations[] = new HyperUniqueAggregator(
            $as, $metric, $isInputHyperUnique, $round
        );

        return $this;
    }

    /**
     * Computes the cardinality of a set of Apache Druid (incubating) dimensions, using HyperLogLog to estimate the
     * cardinality. Please note that this aggregator will be much slower than indexing a column with the hyperUnique
     * aggregator. This aggregator also runs over a dimension column, which means the string dimension cannot be
     * removed from the dataset to improve rollup. In general, we strongly recommend using the hyperUnique aggregator
     * instead of the cardinality aggregator if you do not care about the individual values of a dimension.
     *
     * The HyperLogLog algorithm generates decimal estimates with some error. "round" can be set to true to round off
     * estimated values to whole numbers. Note that even with rounding, the cardinality is still an estimate. The
     * "round" field only affects query-time behavior, and is ignored at ingestion-time.
     *
     * When setting byRow to false (the default) it computes the cardinality of the set composed of the union of all
     * dimension values for all the given dimensions. For a single dimension, this is equivalent to:
     * ```
     * SELECT COUNT(DISTINCT(dimension)) FROM <datasource>
     * ```
     *
     * For multiple dimensions, this is equivalent to something akin to
     * ```
     * SELECT COUNT(DISTINCT(value)) FROM (
     * SELECT dim_1 as value FROM <datasource>
     * UNION
     * SELECT dim_2 as value FROM <datasource>
     * UNION
     * SELECT dim_3 as value FROM <datasource>
     * )
     * ```
     *
     * When setting byRow to true it computes the cardinality by row, i.e. the cardinality of distinct dimension
     * combinations. This is equivalent to something akin to
     *
     * ```
     * SELECT COUNT(*) FROM ( SELECT DIM1, DIM2, DIM3 FROM <datasource> GROUP BY DIM1, DIM2, DIM3 )
     * ```
     *
     * @see https://druid.apache.org/docs/latest/querying/hll-old.html
     *
     * @param string         $as                           The output name which is used for the result.
     * @param \Closure|array $dimensionsOrDimensionBuilder An array with the dimensions which you want to calculate the
     *                                                     cardinality over, or a closure which will receive a
     *                                                     DimensionBuilder. You should build the dimensions which are
     *                                                     used to calculate the cardinality over.
     * @param bool           $byRow                        For more details see method description.
     * @param bool           $round                        Only affects query-time behavior, and is ignored at
     *                                                     ingestion-time. The HyperLogLog algorithm generates decimal
     *                                                     estimates with some error. "round" can be set to true to
     *                                                     round off estimated values to whole numbers. Note that even
     *                                                     with rounding, the cardinality is still an estimate.
     *
     * @return $this
     */
    public function cardinality(string $as, $dimensionsOrDimensionBuilder, bool $byRow = false, bool $round = false)
    {
        if ($dimensionsOrDimensionBuilder instanceof Closure) {
            $builder = new DimensionBuilder();
            call_user_func($dimensionsOrDimensionBuilder, $builder);
            $dimensions = $builder->getDimensions();
        } elseif (is_array($dimensionsOrDimensionBuilder)) {
            $dimensions = [];

            foreach ($dimensionsOrDimensionBuilder as $dimension) {
                $dimensions[] = new Dimension($dimension);
            }
        } else {
            throw new InvalidArgumentException('You should supply a Closure function or an array.');
        }

        $this->aggregations[] = new CardinalityAggregator(
            $as,
            new DimensionCollection(...$dimensions),
            $byRow,
            $round
        );

        return $this;
    }

    /**
     * When a closure is given, we will call the given function which is responsible for building a filter.
     * We will then only apply the given aggregator for the records where the filter matches.
     *
     * @param \Level23\Druid\Aggregations\AggregatorInterface $aggregator
     * @param \Closure|null                                   $filterBuilder
     *
     * @return \Level23\Druid\Aggregations\AggregatorInterface
     */
    protected function buildFilteredAggregation(
        AggregatorInterface $aggregator,
        Closure $filterBuilder = null
    ): AggregatorInterface {
        if (!$filterBuilder) {
            return $aggregator;
        }

        $builder = new FilterBuilder($this->client, $this->query);
        call_user_func($filterBuilder, $builder);
        $filter = $builder->getFilter();

        if ($filter instanceof FilterInterface) {
            return new FilteredAggregator($filter, $aggregator);
        }

        return $aggregator;
    }

    /**
     * Count the number of results and put it in a dimension with the given name.
     *
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only count the
     *                                     records which match with the given filter.
     *
     * @return $this
     */
    public function count(string $as, Closure $filterBuilder = null)
    {
        $this->aggregations[] = $this->buildFilteredAggregation(
            new CountAggregator($as),
            $filterBuilder
        );

        return $this;
    }

    /**
     * Count the number of distinct values of a specific dimension.
     * NOTE: The DataSketches Theta Sketch extension is required to run this aggregation.
     *
     * @param string        $dimension
     * @param string        $as
     * @param int           $size          Must be a power of 2. Internally, size refers to the maximum number of
     *                                     entries sketch object will retain. Higher size means higher accuracy but
     *                                     more space to store sketches. Note that after you index with a particular
     *                                     size, druid will persist sketch in segments and you will use size greater or
     *                                     equal to that at query time. See the DataSketches site for details. In
     *                                     general, We recommend just sticking to default size.
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only count the
     *                                     records which match with the given filter.
     *
     * @return $this
     */
    public function distinctCount(string $dimension, string $as = '', $size = 16384, Closure $filterBuilder = null)
    {
        $this->aggregations[] = $this->buildFilteredAggregation(
            new DistinctCountAggregator($dimension, ($as ?: $dimension), $size),
            $filterBuilder
        );

        return $this;
    }

    /**
     * Get the minimum value for the given metric
     *
     * @param string        $metric
     * @param string        $as
     * @param string        $type
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     min function to the records which match with the given filter.
     *
     * @return $this
     */
    public function min(string $metric, string $as = '', $type = DataType::LONG, Closure $filterBuilder = null)
    {
        $this->aggregations[] = $this->buildFilteredAggregation(
            new MinAggregator($metric, $as, $type),
            $filterBuilder
        );

        return $this;
    }

    /**
     * Get the minimum value for the given metric using long as type
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     min function to the records which match with the given filter.
     *
     * @return $this
     */
    public function longMin(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->min($metric, $as, DataType::LONG, $filterBuilder);
    }

    /**
     * Get the minimum value for the given metric using double as type
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     min function to the records which match with the given filter.
     *
     * @return $this
     */
    public function doubleMin(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->min($metric, $as, DataType::DOUBLE, $filterBuilder);
    }

    /**
     * Get the minimum value for the given metric using float as type
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     min function to the records which match with the given filter.
     *
     * @return $this
     */
    public function floatMin(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->min($metric, $as, DataType::FLOAT, $filterBuilder);
    }

    /**
     * Get the maximum value for the given metric
     *
     * @param string        $metric
     * @param string        $as
     * @param string        $type
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     max function to the records which match with the given filter.
     *
     * @return $this
     */
    public function max(string $metric, string $as = '', $type = DataType::LONG, Closure $filterBuilder = null)
    {
        $this->aggregations[] = $this->buildFilteredAggregation(
            new MaxAggregator($metric, $as, $type),
            $filterBuilder
        );

        return $this;
    }

    /**
     * Get the maximum value for the given metric using long as type
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     max function to the records which match with the given filter.
     *
     * @return $this
     */
    public function longMax(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->max($metric, $as, DataType::LONG, $filterBuilder);
    }

    /**
     * Get the maximum value for the given metric using float as type
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     max function to the records which match with the given filter.
     *
     * @return $this
     */
    public function floatMax(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->max($metric, $as, DataType::FLOAT, $filterBuilder);
    }

    /**
     * Get the maximum value for the given metric using double as type
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     max function to the records which match with the given filter.
     *
     * @return $this
     */
    public function doubleMax(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->max($metric, $as, DataType::DOUBLE, $filterBuilder);
    }

    /**
     * Get the any metric found based on the applied group-by filters.
     * Returns any value including null. This aggregator can simplify and
     * optimize the performance by returning the first encountered value (including null)
     *
     * ANY aggregator cannot be used in ingestion spec, and should only be specified as part of queries.
     *
     * @param string        $metric
     * @param string        $as
     * @param string        $type
     * @param int|null      $maxStringBytes For string types only. Optional, defaults to 1024.
     * @param \Closure|null $filterBuilder  A closure which receives a FilterBuilder. When given, we will only apply the
     *                                      "any" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function any(
        string $metric,
        string $as = '',
        $type = DataType::LONG,
        int $maxStringBytes = null,
        Closure $filterBuilder = null
    ) {
        $this->aggregations[] = $this->buildFilteredAggregation(
            new AnyAggregator($metric, $as, $type, $maxStringBytes),
            $filterBuilder
        );

        return $this;
    }

    /**
     * Get the any metric found based on the applied group-by filters.
     * Returns any value including null. This aggregator can simplify and
     * optimize the performance by returning the first encountered value (including null)
     *
     * ANY aggregator cannot be used in ingestion spec, and should only be specified as part of queries.
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     "any" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function doubleAny(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->any($metric, $as, DataType::DOUBLE, null, $filterBuilder);
    }

    /**
     * Get the any metric found based on the applied group-by filters.
     * Returns any value including null. This aggregator can simplify and
     * optimize the performance by returning the first encountered value (including null)
     *
     * ANY aggregator cannot be used in ingestion spec, and should only be specified as part of queries.
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     "any" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function floatAny(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->any($metric, $as, DataType::FLOAT, null, $filterBuilder);
    }

    /**
     * Get the any metric found based on the applied group-by filters.
     * Returns any value including null. This aggregator can simplify and
     * optimize the performance by returning the first encountered value (including null)
     *
     * ANY aggregator cannot be used in ingestion spec, and should only be specified as part of queries.
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     "any" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function longAny(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->any($metric, $as, DataType::LONG, null, $filterBuilder);
    }

    /**
     * Get the any metric found based on the applied group-by filters.
     * Returns any value including null. This aggregator can simplify and
     * optimize the performance by returning the first encountered value (including null)
     *
     * ANY aggregator cannot be used in ingestion spec, and should only be specified as part of queries.
     *
     * @param string        $metric
     * @param string        $as
     * @param int|null      $maxStringBytes Optional, defaults to 1024
     * @param \Closure|null $filterBuilder  A closure which receives a FilterBuilder. When given, we will only apply the
     *                                      "any" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function stringAny(
        string $metric,
        string $as = '',
        int $maxStringBytes = null,
        Closure $filterBuilder = null
    ) {
        return $this->any($metric, $as, DataType::STRING, $maxStringBytes, $filterBuilder);
    }

    /**
     * Get the first metric found based on the applied group-by filters.
     * So if you group by the dimension "countries", you can get the first "metric" per country.
     *
     * NOTE: This is different from the Laravel ELOQUENT first() method!
     *
     * @param string        $metric
     * @param string        $as
     * @param string        $type
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     "first" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function first(string $metric, string $as = '', $type = DataType::LONG, Closure $filterBuilder = null)
    {
        $this->aggregations[] = $this->buildFilteredAggregation(
            new FirstAggregator($metric, $as, $type),
            $filterBuilder
        );

        return $this;
    }

    /**
     * Get the first metric found based on the applied group-by filters.
     * So if you group by the dimension "countries", you can get the first "metric" per country.
     *
     * NOTE: This is different from the Laravel ELOQUENT first() method!
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     "first" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function longFirst(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->first($metric, $as, DataType::LONG, $filterBuilder);
    }

    /**
     * Get the first metric found based on the applied group-by filters.
     * So if you group by the dimension "countries", you can get the first "metric" per country.
     *
     * NOTE: This is different from the Laravel ELOQUENT first() method!
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     "first" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function floatFirst(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->first($metric, $as, DataType::FLOAT, $filterBuilder);
    }

    /**
     * Get the first metric found based on the applied group-by filters.
     * So if you group by the dimension "countries", you can get the first "metric" per country.
     *
     * NOTE: This is different from the Laravel ELOQUENT first() method!
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     "first" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function doubleFirst(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->first($metric, $as, DataType::DOUBLE, $filterBuilder);
    }

    /**
     * Get the first metric found based on the applied group-by filters.
     * So if you group by the dimension "countries", you can get the first "metric" per country.
     *
     * NOTE: This is different from the Laravel ELOQUENT first() method!
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     "first" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function stringFirst(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->first($metric, $as, DataType::STRING, $filterBuilder);
    }

    /**
     * Get the last metric found
     *
     * @param string        $metric
     * @param string        $as
     * @param string        $type
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     "last" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function last(string $metric, string $as = '', $type = DataType::LONG, Closure $filterBuilder = null)
    {
        $this->aggregations[] = $this->buildFilteredAggregation(
            new LastAggregator($metric, $as, $type),
            $filterBuilder
        );

        return $this;
    }

    /**
     * Get the last metric found based on the applied group-by filters.
     * So if you group by the dimension "countries", you can get the last "metric" per country.
     *
     * NOTE: This is different then the ELOQUENT last() method!
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     "last" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function longLast(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->last($metric, $as, DataType::LONG, $filterBuilder);
    }

    /**
     * Get the last metric found based on the applied group-by filters.
     * So if you group by the dimension "countries", you can get the last "metric" per country.
     *
     * NOTE: This is different then the ELOQUENT last() method!
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     "last" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function floatLast(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->last($metric, $as, DataType::FLOAT, $filterBuilder);
    }

    /**
     * Get the last metric found based on the applied group-by filters.
     * So if you group by the dimension "countries", you can get the last "metric" per country.
     *
     * NOTE: This is different then the ELOQUENT last() method!
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     "last" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function doubleLast(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->last($metric, $as, DataType::DOUBLE, $filterBuilder);
    }

    /**
     * Get the last metric found based on the applied group-by filters.
     * So if you group by the dimension "countries", you can get the last "metric" per country.
     *
     * NOTE: This is different then the ELOQUENT last() method!
     *
     * @param string        $metric
     * @param string        $as
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     "last" function to the records which match with the given filter.
     *
     * @return $this
     */
    public function stringLast(string $metric, string $as = '', Closure $filterBuilder = null)
    {
        return $this->last($metric, $as, DataType::STRING, $filterBuilder);
    }

    /**
     * Computes an arbitrary JavaScript function over a set of columns (both metrics and dimensions are allowed). Your
     * JavaScript functions are expected to return floating-point values.
     *
     * Note: JavaScript-based functionality is disabled by default. Please refer to the Druid JavaScript programming
     * guide for guidelines about using Druid's JavaScript functionality, including instructions on how to enable it.
     *
     * @param string        $as            The output name as the result will be available
     * @param array         $fieldNames    The columns which will be given to the fnAggregate function. Both metrics
     *                                     and dimensions are allowed.
     * @param string        $fnAggregate   A javascript function which does the aggregation. This function will receive
     *                                     the "current" value as first parameter. The other parameters will be the
     *                                     values of the columns as given in the $fieldNames parameter.
     * @param string        $fnCombine     A function which can combine two aggregation results.
     * @param string        $fnReset       A function which will reset a value.
     * @param \Closure|null $filterBuilder A closure which receives a FilterBuilder. When given, we will only apply the
     *                                     javascript function to the records which match with the given filter.
     *
     * @return $this
     */
    public function javascript(
        string $as,
        array $fieldNames,
        string $fnAggregate,
        string $fnCombine,
        string $fnReset,
        Closure $filterBuilder = null
    ) {
        $this->aggregations[] = $this->buildFilteredAggregation(
            new JavascriptAggregator($fieldNames, $as, $fnAggregate, $fnCombine, $fnReset),
            $filterBuilder
        );

        return $this;
    }
}
level23 / druid-client

Pull Request — master (#35)

HasAggregations::doublesSketch() A

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