org.apache.parquet.column.values.delta.DeltaBinaryPackingConfig Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
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* 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
*
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package org.apache.parquet.column.values.delta;
import org.apache.parquet.Preconditions;
import org.apache.parquet.bytes.BytesInput;
import org.apache.parquet.bytes.BytesUtils;
import java.io.IOException;
import java.io.InputStream;
/**
* Config for delta binary packing
*/
class DeltaBinaryPackingConfig {
final int blockSizeInValues;
final int miniBlockNumInABlock;
final int miniBlockSizeInValues;
public DeltaBinaryPackingConfig(int blockSizeInValues, int miniBlockNumInABlock) {
this.blockSizeInValues = blockSizeInValues;
this.miniBlockNumInABlock = miniBlockNumInABlock;
double miniSize = (double) blockSizeInValues / miniBlockNumInABlock;
Preconditions.checkArgument(miniSize % 8 == 0, "miniBlockSize must be multiple of 8, but it's " + miniSize);
this.miniBlockSizeInValues = (int) miniSize;
}
public static DeltaBinaryPackingConfig readConfig(InputStream in) throws IOException {
return new DeltaBinaryPackingConfig(BytesUtils.readUnsignedVarInt(in),
BytesUtils.readUnsignedVarInt(in));
}
public BytesInput toBytesInput() {
return BytesInput.concat(
BytesInput.fromUnsignedVarInt(blockSizeInValues),
BytesInput.fromUnsignedVarInt(miniBlockNumInABlock));
}
}