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Add Kll histogram support to Iceberg connector
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161
presto-iceberg/src/main/java/com/facebook/presto/iceberg/statistics/KllHistogram.java
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| /* | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.facebook.presto.iceberg.statistics; | ||
|
|
||
| import com.facebook.presto.common.type.Type; | ||
| import com.facebook.presto.common.type.TypeUtils; | ||
| import com.facebook.presto.spi.PrestoException; | ||
| import com.facebook.presto.spi.statistics.ConnectorHistogram; | ||
| import com.facebook.presto.spi.statistics.Estimate; | ||
| import com.fasterxml.jackson.annotation.JsonCreator; | ||
| import com.fasterxml.jackson.annotation.JsonProperty; | ||
| import io.airlift.slice.Slice; | ||
| import io.airlift.slice.Slices; | ||
| import org.apache.datasketches.common.ArrayOfBooleansSerDe; | ||
| import org.apache.datasketches.common.ArrayOfDoublesSerDe; | ||
| import org.apache.datasketches.common.ArrayOfItemsSerDe; | ||
| import org.apache.datasketches.common.ArrayOfLongsSerDe; | ||
| import org.apache.datasketches.common.ArrayOfStringsSerDe; | ||
| import org.apache.datasketches.kll.KllItemsSketch; | ||
| import org.apache.datasketches.memory.Memory; | ||
|
|
||
| import java.util.Comparator; | ||
| import java.util.function.Function; | ||
|
|
||
| import static com.facebook.presto.spi.StandardErrorCode.INVALID_ARGUMENTS; | ||
| import static com.google.common.base.MoreObjects.toStringHelper; | ||
| import static com.google.common.base.Verify.verify; | ||
| import static java.nio.ByteOrder.LITTLE_ENDIAN; | ||
| import static java.util.Objects.requireNonNull; | ||
| import static org.apache.datasketches.quantilescommon.QuantileSearchCriteria.EXCLUSIVE; | ||
| import static org.apache.datasketches.quantilescommon.QuantileSearchCriteria.INCLUSIVE; | ||
|
|
||
| public class KllHistogram | ||
| implements ConnectorHistogram | ||
| { | ||
| private final KllItemsSketch dataSketch; | ||
| private final Type type; | ||
| private final Function<Object, Double> toDouble; | ||
| private final Function<Double, Object> fromDouble; | ||
|
|
||
| @JsonCreator | ||
| public KllHistogram(@JsonProperty("sketch") Slice bytes, @JsonProperty("type") Type type) | ||
| { | ||
| verify(TypeUtils.isNumericType(type), "only numeric types support histograms"); | ||
| this.type = requireNonNull(type, "type is null"); | ||
| SketchParameters parameters = getSketchParameters(type); | ||
| // the actual sketch can only accept the same object types which generated it | ||
| // however, the API can only accept or generate double types. We cast the inputs | ||
| // and results to/from double to satisfy the underlying sketch type. | ||
| if (type.getJavaType().isAssignableFrom(double.class)) { | ||
| toDouble = x -> (double) x; | ||
| fromDouble = x -> x; | ||
| } | ||
| else if (type.getJavaType().isAssignableFrom(long.class)) { | ||
| toDouble = x -> (double) (long) x; | ||
| fromDouble = x -> (long) (double) x; | ||
| } | ||
| else if (type.getJavaType().isAssignableFrom(int.class)) { | ||
| toDouble = x -> (double) (int) x; | ||
| fromDouble = x -> (int) (double) x; | ||
| } | ||
| else { | ||
| throw new PrestoException(INVALID_ARGUMENTS, "can't create kll sketch from type: " + type); | ||
| } | ||
| dataSketch = KllItemsSketch.wrap(Memory.wrap(bytes.toByteBuffer(), LITTLE_ENDIAN), parameters.getComparator(), parameters.getSerde()); | ||
| } | ||
|
|
||
| @JsonProperty | ||
| public Slice getDataSketch() | ||
| { | ||
| return Slices.wrappedBuffer(dataSketch.toByteArray()); | ||
| } | ||
|
|
||
| @JsonProperty | ||
| public Type getType() | ||
| { | ||
| return type; | ||
| } | ||
|
|
||
| @Override | ||
| public Estimate cumulativeProbability(double value, boolean inclusive) | ||
| { | ||
| return Estimate.of(dataSketch.getRank(fromDouble.apply(value), inclusive ? INCLUSIVE : EXCLUSIVE)); | ||
| } | ||
|
|
||
| @Override | ||
| public Estimate inverseCumulativeProbability(double percentile) | ||
| { | ||
| return Estimate.of(toDouble.apply(dataSketch.getQuantile(percentile))); | ||
| } | ||
|
|
||
| @Override | ||
| public String toString() | ||
| { | ||
| return toStringHelper(this) | ||
| .add("type", type) | ||
| .add("k", this.dataSketch.getK()) | ||
| .add("N", this.dataSketch.getN()) | ||
| .add("retained", this.dataSketch.getNumRetained()) | ||
| .add("min", this.dataSketch.getMinItem()) | ||
| .add("max", this.dataSketch.getMaxItem()) | ||
| .add("p50", dataSketch.getQuantile(0.5)) | ||
| .add("p75", dataSketch.getQuantile(0.75)) | ||
| .add("p90", dataSketch.getQuantile(0.90)) | ||
| .add("p99", dataSketch.getQuantile(0.99)) | ||
| .add("p99.9", dataSketch.getQuantile(0.999)) | ||
| .toString(); | ||
| } | ||
|
|
||
| private static class SketchParameters<T> | ||
| { | ||
| private final Comparator<T> comparator; | ||
| private final ArrayOfItemsSerDe<T> serde; | ||
|
|
||
| public SketchParameters(Comparator<T> comparator, ArrayOfItemsSerDe<T> serde) | ||
| { | ||
| this.comparator = comparator; | ||
| this.serde = serde; | ||
| } | ||
|
|
||
| public Comparator<T> getComparator() | ||
| { | ||
| return comparator; | ||
| } | ||
|
|
||
| public ArrayOfItemsSerDe<T> getSerde() | ||
| { | ||
| return serde; | ||
| } | ||
| } | ||
|
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| private static SketchParameters<?> getSketchParameters(Type type) | ||
| { | ||
| if (type.getJavaType().equals(double.class)) { | ||
| return new SketchParameters<>(Double::compareTo, new ArrayOfDoublesSerDe()); | ||
| } | ||
| else if (type.getJavaType().equals(long.class)) { | ||
| return new SketchParameters<>(Long::compareTo, new ArrayOfLongsSerDe()); | ||
| } | ||
| else if (type.getJavaType().equals(Slice.class)) { | ||
| return new SketchParameters<>(String::compareTo, new ArrayOfStringsSerDe()); | ||
| } | ||
| else if (type.getJavaType().equals(boolean.class)) { | ||
| return new SketchParameters<>(Boolean::compareTo, new ArrayOfBooleansSerDe()); | ||
| } | ||
| else { | ||
| throw new PrestoException(INVALID_ARGUMENTS, "failed to deserialize KLL Sketch. No suitable type found for " + type); | ||
| } | ||
| } | ||
| } |