org.apache.hadoop.hive.ql.plan.FetchWork 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.hadoop.hive.ql.plan;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.TreeMap;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.ql.exec.ListSinkOperator;
import org.apache.hadoop.hive.ql.exec.Operator;
import org.apache.hadoop.hive.ql.exec.OperatorFactory;
import org.apache.hadoop.hive.ql.parse.SplitSample;
import org.apache.hadoop.hive.ql.plan.Explain.Level;
import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;

/**
 * FetchWork.
 *
 */
@Explain(displayName = "Fetch Operator", explainLevels = { Level.USER, Level.DEFAULT, Level.EXTENDED })
public class FetchWork implements Serializable {
  private static final long serialVersionUID = 1L;

  private Path tblDir;
  private TableDesc tblDesc;

  private ArrayList partDir;
  private ArrayList partDesc;

  private Operator source;
  private ListSinkOperator sink;

  private int limit;
  private int leastNumRows;

  private SplitSample splitSample;

  private transient List> rowsComputedFromStats;
  private transient StructObjectInspector statRowOI;

  /**
   * Serialization Null Format for the serde used to fetch data.
   */
  private String serializationNullFormat = "NULL";

  public FetchWork() {
  }

  public FetchWork(List> rowsComputedFromStats, StructObjectInspector statRowOI) {
    this.rowsComputedFromStats = rowsComputedFromStats;
    this.statRowOI = statRowOI;
  }

  public StructObjectInspector getStatRowOI() {
    return statRowOI;
  }

  public List> getRowsComputedUsingStats() {
    return rowsComputedFromStats;
  }

  public FetchWork(Path tblDir, TableDesc tblDesc) {
    this(tblDir, tblDesc, -1);
  }

  public FetchWork(Path tblDir, TableDesc tblDesc, int limit) {
    this.tblDir = tblDir;
    this.tblDesc = tblDesc;
    this.limit = limit;
  }

  public FetchWork(List partDir, List partDesc, TableDesc tblDesc) {
    this(partDir, partDesc, tblDesc, -1);
  }

  public FetchWork(List partDir, List partDesc,
      TableDesc tblDesc, int limit) {
    this.tblDesc = tblDesc;
    this.partDir = new ArrayList(partDir);
    this.partDesc = new ArrayList(partDesc);
    this.limit = limit;
  }

  public void initializeForFetch() {
    if (source == null) {
      ListSinkDesc desc = new ListSinkDesc(serializationNullFormat);
      sink = (ListSinkOperator) OperatorFactory.get(desc);
      source = sink;
    }
  }

  public String getSerializationNullFormat() {
    return serializationNullFormat;
  }

  public void setSerializationNullFormat(String format) {
    serializationNullFormat = format;
  }

  public boolean isNotPartitioned() {
    return tblDir != null;
  }

  public boolean isPartitioned() {
    return tblDir == null;
  }

  /**
   * @return the tblDir
   */
  public Path getTblDir() {
    return tblDir;
  }

  /**
   * @param tblDir
   *          the tblDir to set
   */
  public void setTblDir(Path tblDir) {
    this.tblDir = tblDir;
  }

  /**
   * @return the tblDesc
   */
  public TableDesc getTblDesc() {
    return tblDesc;
  }

  /**
   * @param tblDesc
   *          the tblDesc to set
   */
  public void setTblDesc(TableDesc tblDesc) {
    this.tblDesc = tblDesc;
  }

  /**
   * @return the partDir
   */
  public ArrayList getPartDir() {
    return partDir;
  }

  /**
   * @param partDir
   *          the partDir to set
   */
  public void setPartDir(ArrayList partDir) {
    this.partDir = partDir;
  }

  /**
   * @return the partDesc
   */
  public ArrayList getPartDesc() {
    return partDesc;
  }

  public List getPathLists() {
    return isPartitioned() ? partDir == null ?
        null : new ArrayList(partDir) : Arrays.asList(tblDir);
  }

  /**
   * Get Partition descriptors in sorted (ascending) order of partition directory
   *
   * @return the partDesc array list
   */
  @Explain(displayName = "Partition Description", explainLevels = { Level.EXTENDED })
  public ArrayList getPartDescOrderedByPartDir() {
    ArrayList partDescOrdered = partDesc;

    if (partDir != null && partDir.size() > 1) {
      if (partDesc == null || partDir.size() != partDesc.size()) {
        throw new RuntimeException(
            "Partiton Directory list size doesn't match Partition Descriptor list size");
      }

      // Construct a sorted Map of Partition Dir - Partition Descriptor; ordering is based on
      // patition dir (map key)
      // Assumption: there is a 1-1 mapping between partition dir and partition descriptor lists
      TreeMap partDirToPartSpecMap = new TreeMap();
      for (int i = 0; i < partDir.size(); i++) {
        partDirToPartSpecMap.put(partDir.get(i), partDesc.get(i));
      }

      // Extract partition desc from sorted map (ascending order of part dir)
      partDescOrdered = new ArrayList(partDirToPartSpecMap.values());
    }

    return partDescOrdered;
  }

  /**
   * @return the partDescs for paths
   */
  public List getPartDescs(List paths) {
    List parts = new ArrayList(paths.size());
    for (Path path : paths) {
      parts.add(partDesc.get(partDir.indexOf(path.getParent())));
    }
    return parts;
  }

  /**
   * @param partDesc
   *          the partDesc to set
   */
  public void setPartDesc(ArrayList partDesc) {
    this.partDesc = partDesc;
  }

  /**
   * @return the limit
   */
  @Explain(displayName = "limit", explainLevels = { Level.USER, Level.DEFAULT, Level.EXTENDED })
  public int getLimit() {
    return limit;
  }

  /**
   * @param limit
   *          the limit to set
   */
  public void setLimit(int limit) {
    this.limit = limit;
  }

  public int getLeastNumRows() {
    return leastNumRows;
  }

  public void setLeastNumRows(int leastNumRows) {
    this.leastNumRows = leastNumRows;
  }

  @Explain(displayName = "Processor Tree", explainLevels = { Level.USER, Level.DEFAULT, Level.EXTENDED })
  public Operator getSource() {
    return source;
  }

  public void setSource(Operator source) {
    this.source = source;
  }

  public ListSinkOperator getSink() {
    return sink;
  }

  public void setSink(ListSinkOperator sink) {
    this.sink = sink;
  }

  public void setSplitSample(SplitSample splitSample) {
    this.splitSample = splitSample;
  }

  public SplitSample getSplitSample() {
    return splitSample;
  }

  @Override
  public String toString() {
    if (tblDir != null) {
      return new String("table = " + tblDir);
    }

    if (partDir == null) {
      return "null fetchwork";
    }

    String ret = "partition = ";
    for (Path part : partDir) {
      ret = ret.concat(part.toUri().toString());
    }

    return ret;
  }
}