org.apache.drill.exec.physical.config.StatisticsMerge Maven / Gradle / Ivy

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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.
 */
package org.apache.drill.exec.physical.config;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeName;
import java.util.Map;
import org.apache.drill.exec.physical.base.AbstractSingle;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.base.PhysicalVisitor;
import org.apache.drill.shaded.guava.com.google.common.collect.ImmutableMap;

@JsonTypeName("statistics-merge")
public class StatisticsMerge extends AbstractSingle {

  public static final String OPERATOR_TYPE = "STATISTICS_MERGE";

  private final Map functions;
  private final double samplePercent;

  @JsonCreator
  public StatisticsMerge(
      @JsonProperty("child") PhysicalOperator child,
      @JsonProperty("functions") Map functions,
      @JsonProperty("samplePercent") double samplePercent) {
    super(child);
    this.functions = ImmutableMap.copyOf(functions);
    this.samplePercent = samplePercent;
  }

  public Map getFunctions() {
    return functions;
  }

  public double getSamplePercent() {
    return samplePercent;
  }

  @Override
  public  T accept(PhysicalVisitor physicalVisitor, X value)
      throws E {
    return physicalVisitor.visitStatisticsMerge(this, value);
  }

  @Override
  protected PhysicalOperator getNewWithChild(PhysicalOperator child) {
    return new StatisticsMerge(child, functions, samplePercent);
  }

  @Override
  public String getOperatorType() {
    return OPERATOR_TYPE;
  }
}