parquet.column.values.bitpacking

Class IntPacker

java.lang.Object

parquet.column.values.bitpacking.IntPacker

public abstract class IntPacker
extends Object

Packs and unpacks into ints packing unpacking treats: - 32 values at a time - bitWidth ints at a time.

Author:

Julien Le Dem

Method Summary

Methods

Modifier and Type	Method and Description
int	getBitWidth()
abstract void	pack32Values(int[] input, int inPos, int[] output, int outPos) pack 32 values from input at inPos into bitWidth ints in output at outPos.
abstract void	unpack32Values(int[] input, int inPos, int[] output, int outPos) unpack bitWidth ints from input at inPos into 32 values in output at outPos.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getBitWidth

public final int getBitWidth()

Returns:

the width in bits used for encoding, also how many ints are packed/unpacked at a time

pack32Values

public abstract void pack32Values(int[] input,
                int inPos,
                int[] output,
                int outPos)

pack 32 values from input at inPos into bitWidth ints in output at outPos. nextPosition: inPos += 32; outPos += getBitWidth()

Parameters:

input - the input values

inPos - where to read from in input

output - the output ints

outPos - where to write to in output

unpack32Values

public abstract void unpack32Values(int[] input,
                  int inPos,
                  int[] output,
                  int outPos)

unpack bitWidth ints from input at inPos into 32 values in output at outPos. nextPosition: inPos += getBitWidth(); outPos += 32

Parameters:

input - the input int

inPos - where to read from in input

output - the output values

outPos - where to write to in output