org.apache.hive.storage.jdbc.spitter.TimestampIntervalSplitter.java Source code

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Here is the source code for org.apache.hive.storage.jdbc.spitter.TimestampIntervalSplitter.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 org.apache.hive.storage.jdbc.spitter;

import org.apache.commons.lang3.tuple.MutablePair;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;

import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.List;

public class TimestampIntervalSplitter implements IntervalSplitter {
    @Override
    public List<MutablePair<String, String>> getIntervals(String lowerBound, String upperBound, int numPartitions,
            TypeInfo typeInfo) {
        List<MutablePair<String, String>> intervals = new ArrayList<>();
        Timestamp timestampLower = Timestamp.valueOf(lowerBound);
        Timestamp timestampUpper = Timestamp.valueOf(upperBound);
        // Note nano is not fully represented as the precision limit
        double timestampInterval = (timestampUpper.getTime() - timestampLower.getTime()) / (double) numPartitions;
        Timestamp splitTimestampLower, splitTimestampUpper;
        for (int i = 0; i < numPartitions; i++) {
            splitTimestampLower = new Timestamp(Math.round(timestampLower.getTime() + timestampInterval * i));
            splitTimestampUpper = new Timestamp(Math.round(timestampLower.getTime() + timestampInterval * (i + 1)));
            if (splitTimestampLower.compareTo(splitTimestampUpper) < 0) {
                intervals.add(new MutablePair<String, String>(splitTimestampLower.toString(),
                        splitTimestampUpper.toString()));
            }
        }
        return intervals;
    }
}