parquet.column.values.bitpacking

Class BitPackingValuesReader

java.lang.Object

parquet.column.values.ValuesReader

parquet.column.values.bitpacking.BitPackingValuesReader

public class BitPackingValuesReader
extends ValuesReader

a column reader that packs the ints in the number of bits required based on the maximum size.

Author:

Julien Le Dem

Constructor Summary

Constructors

Constructor and Description
BitPackingValuesReader(int bound)

Method Summary

Methods

Modifier and Type	Method and Description
int	initFromPage(long valueCount, byte[] in, int offset) Called to initialize the column reader from a part of a page.
int	readInteger()
void	skip() Skips the next value in the page

Methods inherited from class parquet.column.values.ValuesReader

readBoolean, readBytes, readDouble, readFloat, readLong, readValueDictionaryId

Methods inherited from class java.lang.Object

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

Constructor Detail

BitPackingValuesReader

public BitPackingValuesReader(int bound)

Parameters:

bound - the maximum value stored by this column

Method Detail

readInteger

public int readInteger()

Overrides:

readInteger in class ValuesReader

Returns:

the next integer from the page

See Also:

ValuesReader.readInteger()

initFromPage

public int initFromPage(long valueCount,
               byte[] in,
               int offset)
                 throws IOException

Called to initialize the column reader from a part of a page. The underlying implementation knows how much data to read, so a length is not provided. Each page may contain several sections:

• repetition levels column
• definition levels column
• data column

This function is called with 'offset' pointing to the beginning of one of these sections, and should return the offset to the section following it.

Specified by:

initFromPage in class ValuesReader

Parameters:

valueCount - count of values in this page

in - the array to read from containing the page data (repetition levels, definition levels, data)

offset - where to start reading from in the page

Returns:

the offset of the end of the data for this section of the page

Throws:

IOException

See Also:

ValuesReader.initFromPage(long, byte[], int)

skip

public void skip()

Description copied from class: ValuesReader

Skips the next value in the page

Specified by:

skip in class ValuesReader