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

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Here is the source code for org.apache.hive.storage.jdbc.spitter.DecimalIntervalSplitter.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.DecimalTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;

import java.math.BigDecimal;
import java.math.MathContext;
import java.math.RoundingMode;
import java.util.ArrayList;
import java.util.List;

public class DecimalIntervalSplitter implements IntervalSplitter {
    @Override
    public List<MutablePair<String, String>> getIntervals(String lowerBound, String upperBound, int numPartitions,
            TypeInfo typeInfo) {
        List<MutablePair<String, String>> intervals = new ArrayList<>();
        DecimalTypeInfo decimalTypeInfo = (DecimalTypeInfo) typeInfo;
        int scale = decimalTypeInfo.getScale();
        BigDecimal decimalLower = new BigDecimal(lowerBound);
        BigDecimal decimalUpper = new BigDecimal(upperBound);
        BigDecimal decimalInterval = (decimalUpper.subtract(decimalLower)).divide(new BigDecimal(numPartitions),
                MathContext.DECIMAL64);
        BigDecimal splitDecimalLower, splitDecimalUpper;
        for (int i = 0; i < numPartitions; i++) {
            splitDecimalLower = decimalLower.add(decimalInterval.multiply(new BigDecimal(i))).setScale(scale,
                    RoundingMode.HALF_EVEN);
            splitDecimalUpper = decimalLower.add(decimalInterval.multiply(new BigDecimal(i + 1))).setScale(scale,
                    RoundingMode.HALF_EVEN);
            if (splitDecimalLower.compareTo(splitDecimalUpper) < 0) {
                intervals.add(new MutablePair<String, String>(splitDecimalLower.toPlainString(),
                        splitDecimalUpper.toPlainString()));
            }
        }
        return intervals;
    }
}