Package org.apache.parquet.column.values.bytestreamsplit

Class ByteStreamSplitValuesReader

java.lang.Object

org.apache.parquet.column.values.ValuesReader

org.apache.parquet.column.values.bytestreamsplit.ByteStreamSplitValuesReader

Direct Known Subclasses:

ByteStreamSplitValuesReaderForDouble, ByteStreamSplitValuesReaderForFLBA, ByteStreamSplitValuesReaderForFloat, ByteStreamSplitValuesReaderForInteger, ByteStreamSplitValuesReaderForLong

public abstract class ByteStreamSplitValuesReader
extends ValuesReader

Field Summary

Fields

Modifier and Type	Field	Description
protected ByteBuffer	decodedDataBuffer
protected int	elementSizeInBytes

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ByteStreamSplitValuesReader(int elementSizeInBytes)

Method Summary

Modifier and Type	Method	Description
void	initFromPage(int valuesCount, ByteBufferInputStream stream)	Called to initialize the column reader from a part of a page.
protected int	nextElementByteOffset()
void	skip()	Skips the next value in the page
void	skip(int n)	Skips the next n values in the page

Methods inherited from class org.apache.parquet.column.values.ValuesReader

getNextOffset, initFromPage, initFromPage, readBoolean, readBytes, readDouble, readFloat, readInteger, readLong, readValueDictionaryId, updateNextOffset

Methods inherited from class java.lang.Object

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

Field Detail

elementSizeInBytes

protected final int elementSizeInBytes

decodedDataBuffer

protected ByteBuffer decodedDataBuffer

Constructor Detail

ByteStreamSplitValuesReader

protected ByteStreamSplitValuesReader(int elementSizeInBytes)

Method Detail

nextElementByteOffset

protected int nextElementByteOffset()

initFromPage

public void initFromPage(int valuesCount,
                         ByteBufferInputStream stream)
                  throws ParquetDecodingException,
                         IOException

Description copied from class: ValuesReader

Called to initialize the column reader from a part of a page.

Implementations must consume all bytes from the input stream, leaving the stream ready to read the next section of data. 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

Overrides:

initFromPage in class ValuesReader

Parameters:

valuesCount - count of values in this page

stream - an input stream containing the page data at the correct offset

Throws:

IOException - if there is an exception while reading from the input stream

ParquetDecodingException

skip

public void skip()

Description copied from class: ValuesReader

Skips the next value in the page

Specified by:

skip in class ValuesReader

skip

public void skip(int n)

Description copied from class: ValuesReader

Skips the next n values in the page

Overrides:

skip in class ValuesReader

Parameters:

n - the number of values to be skipped