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Add table sampling with fixed shard #15128
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122 changes: 122 additions & 0 deletions
122
processing/src/main/java/org/apache/druid/query/SampledTableDataSource.java
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/* | ||
* Licensed to the Apache Software Foundation (ASF) under one | ||
* or more contributor license agreements. See the NOTICE file | ||
* distributed with this work for additional information | ||
* regarding copyright ownership. The ASF licenses this file | ||
* to you 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. | ||
*/ | ||
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package org.apache.druid.query; | ||
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import com.fasterxml.jackson.annotation.JsonCreator; | ||
import com.fasterxml.jackson.annotation.JsonProperty; | ||
import com.fasterxml.jackson.annotation.JsonTypeName; | ||
import com.fasterxml.jackson.annotation.JsonValue; | ||
import org.apache.druid.java.util.common.Cacheable; | ||
import org.apache.druid.java.util.common.StringUtils; | ||
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@JsonTypeName("sampled_table") | ||
public class SampledTableDataSource extends TableDataSource | ||
{ | ||
private final SamplingType samplingType; | ||
private final int samplingPercentage; | ||
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public enum SamplingType implements Cacheable | ||
{ | ||
FIXED_SHARD; | ||
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@JsonValue | ||
@Override | ||
public String toString() | ||
{ | ||
return StringUtils.toLowerCase(this.name()); | ||
} | ||
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@JsonCreator | ||
public static SamplingType fromString(String name) | ||
{ | ||
return valueOf(StringUtils.toUpperCase(name)); | ||
} | ||
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@Override | ||
public byte[] getCacheKey() | ||
{ | ||
return new byte[] {(byte) this.ordinal()}; | ||
} | ||
} | ||
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@JsonCreator | ||
public SampledTableDataSource( | ||
@JsonProperty("name") String name, | ||
@JsonProperty("samplingType") SamplingType samplingType, | ||
@JsonProperty("samplingPercentage") int samplingPercentage | ||
) | ||
{ | ||
super(name); | ||
this.samplingType = samplingType; | ||
this.samplingPercentage = samplingPercentage; | ||
} | ||
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@JsonCreator | ||
public static SampledTableDataSource create( | ||
@JsonProperty("name")final String name, | ||
@JsonProperty("samplingType")final String samplingType, | ||
@JsonProperty("samplingPercentage")final int samplingPercentage) | ||
{ | ||
return new SampledTableDataSource(name, SamplingType.fromString(samplingType), samplingPercentage); | ||
} | ||
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@JsonProperty | ||
public SamplingType getSamplingType() | ||
{ | ||
return samplingType; | ||
} | ||
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@JsonProperty | ||
public float getSamplingPercentage() | ||
{ | ||
return samplingPercentage; | ||
} | ||
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@Override | ||
public boolean equals(Object o) | ||
{ | ||
if (this == o) { | ||
return true; | ||
} | ||
if (!(o instanceof SampledTableDataSource)) { | ||
return false; | ||
} | ||
if (!super.equals(o)) { | ||
return false; | ||
} | ||
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SampledTableDataSource that = (SampledTableDataSource) o; | ||
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if (samplingPercentage != that.samplingPercentage) { | ||
return false; | ||
} | ||
return samplingType == that.samplingType; | ||
} | ||
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@Override | ||
public int hashCode() | ||
{ | ||
int result = super.hashCode(); | ||
result = 31 * result + (samplingType != null ? samplingType.hashCode() : 0); | ||
result = 31 * result + samplingPercentage; | ||
return result; | ||
} | ||
} |
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