org.apache.paimon.format.parquet.reader

Class ByteColumnReader

java.lang.Object

org.apache.paimon.format.parquet.reader.AbstractColumnReader<WritableByteVector>

org.apache.paimon.format.parquet.reader.ByteColumnReader

All Implemented Interfaces:

ColumnReader<WritableByteVector>

public class ByteColumnReader
extends AbstractColumnReader<WritableByteVector>

Byte ColumnReader. Using INT32 to store byte, so just cast int to byte.

Field Summary

Fields inherited from class org.apache.paimon.format.parquet.reader.AbstractColumnReader

descriptor, dictionary, maxDefLevel, runLenDecoder

Constructor Summary

Constructors

Constructor and Description
ByteColumnReader(org.apache.parquet.column.ColumnDescriptor descriptor, org.apache.parquet.column.page.PageReader pageReader)

Method Summary

Modifier and Type	Method and Description
protected void	readBatch(int rowId, int num, WritableByteVector column) Read batch from AbstractColumnReader.runLenDecoder and AbstractColumnReader.dataInputStream.
protected void	readBatchFromDictionaryIds(int rowId, int num, WritableByteVector column, WritableIntVector dictionaryIds) Decode dictionary ids to data.

Methods inherited from class org.apache.paimon.format.parquet.reader.AbstractColumnReader

afterReadPage, checkTypeName, readToVector, supportLazyDecode

Methods inherited from class java.lang.Object

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

Constructor Detail

ByteColumnReader

public ByteColumnReader(org.apache.parquet.column.ColumnDescriptor descriptor,
                        org.apache.parquet.column.page.PageReader pageReader)
                 throws IOException

Throws:

IOException

Method Detail

readBatch

protected void readBatch(int rowId,
                         int num,
                         WritableByteVector column)

Description copied from class: AbstractColumnReader

Read batch from AbstractColumnReader.runLenDecoder and AbstractColumnReader.dataInputStream.

Specified by:

readBatch in class AbstractColumnReader<WritableByteVector>

readBatchFromDictionaryIds

protected void readBatchFromDictionaryIds(int rowId,
                                          int num,
                                          WritableByteVector column,
                                          WritableIntVector dictionaryIds)

Description copied from class: AbstractColumnReader

Decode dictionary ids to data. From AbstractColumnReader.runLenDecoder and AbstractColumnReader.dictionaryIdsDecoder.

Specified by:

readBatchFromDictionaryIds in class AbstractColumnReader<WritableByteVector>