org.apache.tajo.engine.utils.TupleUtil.java Source code

Introduction

Here is the source code for org.apache.tajo.engine.utils.TupleUtil.java

Source

/**
 * 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.tajo.engine.utils;

import com.google.common.base.Preconditions;
import com.google.common.collect.Maps;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.tajo.catalog.Column;
import org.apache.tajo.catalog.Schema;
import org.apache.tajo.catalog.SortSpec;
import org.apache.tajo.catalog.statistics.ColumnStats;
import org.apache.tajo.datum.DatumFactory;
import org.apache.tajo.datum.NullDatum;
import org.apache.tajo.storage.Tuple;
import org.apache.tajo.storage.TupleRange;
import org.apache.tajo.storage.VTuple;

import java.util.List;
import java.util.Map;

public class TupleUtil {
    private static final Log LOG = LogFactory.getLog(TupleUtil.class);

    /**
     * if max value is null, set ranges[last]
     * @param sortSpecs
     * @param sortSchema
     * @param colStats
     * @param ranges
     */
    public static void setMaxRangeIfNull(SortSpec[] sortSpecs, Schema sortSchema, List<ColumnStats> colStats,
            TupleRange[] ranges) {
        Map<Column, ColumnStats> statMap = Maps.newHashMap();
        for (ColumnStats stat : colStats) {
            statMap.put(stat.getColumn(), stat);
        }

        int i = 0;
        for (Column col : sortSchema.getRootColumns()) {
            ColumnStats columnStat = statMap.get(col);
            if (columnStat == null) {
                continue;
            }
            if (columnStat.hasNullValue()) {
                if (sortSpecs[i].isNullsFirst()) {
                    Tuple rangeTuple = ranges[0].getStart();
                    rangeTuple.put(i, NullDatum.get());
                } else {
                    Tuple rangeTuple = ranges[ranges.length - 1].getEnd();
                    if (LOG.isDebugEnabled()) {
                        LOG.debug("Set null into range: " + col.getQualifiedName() + ", previous tuple is "
                                + rangeTuple);
                    }
                    rangeTuple.put(i, NullDatum.get());
                    LOG.info("Set null into range: " + col.getQualifiedName() + ", current tuple is " + rangeTuple);
                }
            }
            i++;
        }
    }

    public static TupleRange columnStatToRange(SortSpec[] sortSpecs, Schema target, List<ColumnStats> colStats,
            boolean checkNull) {

        Map<Column, ColumnStats> statSet = Maps.newHashMap();
        for (ColumnStats stat : colStats) {
            statSet.put(stat.getColumn(), stat);
        }

        for (Column col : target.getRootColumns()) {
            Preconditions.checkState(statSet.containsKey(col),
                    "ERROR: Invalid Column Stats (column stats: " + colStats + ", there exists not target " + col);
        }

        VTuple startTuple = new VTuple(target.size());
        VTuple endTuple = new VTuple(target.size());
        int i = 0;
        int sortSpecIndex = 0;

        // In outer join, empty table could be searched.
        // As a result, min value and max value would be null.
        // So, we should put NullDatum for this case.
        for (Column col : target.getRootColumns()) {
            if (sortSpecs[sortSpecIndex].isAscending()) {
                if (statSet.get(col).getMinValue() != null)
                    startTuple.put(i, statSet.get(col).getMinValue());
                else
                    startTuple.put(i, DatumFactory.createNullDatum());

                if (checkNull) {
                    if (statSet.get(col).hasNullValue() || statSet.get(col).getMaxValue() == null)
                        endTuple.put(i, DatumFactory.createNullDatum());
                    else
                        endTuple.put(i, statSet.get(col).getMaxValue());
                } else {
                    if (statSet.get(col).getMaxValue() != null)
                        endTuple.put(i, statSet.get(col).getMaxValue());
                    else
                        endTuple.put(i, DatumFactory.createNullDatum());
                }
            } else {
                if (checkNull) {
                    if (statSet.get(col).hasNullValue() || statSet.get(col).getMaxValue() == null)
                        startTuple.put(i, DatumFactory.createNullDatum());
                    else
                        startTuple.put(i, statSet.get(col).getMaxValue());
                } else {
                    if (statSet.get(col).getMaxValue() != null)
                        startTuple.put(i, statSet.get(col).getMaxValue());
                    else
                        startTuple.put(i, DatumFactory.createNullDatum());
                }
                if (statSet.get(col).getMinValue() != null)
                    endTuple.put(i, statSet.get(col).getMinValue());
                else
                    endTuple.put(i, DatumFactory.createNullDatum());
            }
            if (target.getRootColumns().size() == sortSpecs.length) {
                // Not composite column sort
                sortSpecIndex++;
            }
            i++;
        }
        return new TupleRange(sortSpecs, startTuple, endTuple);
    }
}