parquet.column.values.delta.DeltaBinaryPackingConfig Maven / Gradle / Ivy
/**
* Copyright 2012 Twitter, Inc.
*
* 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 parquet.column.values.delta;
import parquet.Preconditions;
import parquet.bytes.BytesInput;
import parquet.bytes.BytesUtils;
import java.io.IOException;
import java.io.InputStream;
/**
* Config for delta binary packing
*
* @author Tianshuo Deng
*/
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));
}
}