org.apache.iceberg.arrow.vectorized.parquet

Class BaseVectorizedParquetValuesReader

java.lang.Object

org.apache.parquet.column.values.ValuesReader

org.apache.iceberg.arrow.vectorized.parquet.BaseVectorizedParquetValuesReader

Direct Known Subclasses:

VectorizedDictionaryEncodedParquetValuesReader, VectorizedParquetDefinitionLevelReader

public class BaseVectorizedParquetValuesReader
extends org.apache.parquet.column.values.ValuesReader

A values reader for Parquet's run-length encoded data that reads column data in batches instead of one value at a time. This is based off of the VectorizedRleValuesReader class in Apache Spark with these changes:

Writes batches of values retrieved to Arrow vectors. If all pages of a column within the row group are not dictionary encoded, then dictionary ids are eagerly decoded into actual values before writing them to the Arrow vectors

Constructor Summary

Constructors

Constructor and Description
BaseVectorizedParquetValuesReader(int maxDefLevel, boolean setValidityVector)
BaseVectorizedParquetValuesReader(int bitWidth, int maxDefLevel, boolean setValidityVector)

Method Summary

Modifier and Type	Method and Description
void	initFromPage(int valueCount, org.apache.parquet.bytes.ByteBufferInputStream in)
boolean	readBoolean()
int	readInteger()
int	readValueDictionaryId()
void	skip()

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

getNextOffset, initFromPage, initFromPage, readBytes, readDouble, readFloat, readLong, skip, updateNextOffset

Methods inherited from class java.lang.Object

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

Constructor Detail

BaseVectorizedParquetValuesReader

public BaseVectorizedParquetValuesReader(int maxDefLevel,
                                         boolean setValidityVector)

BaseVectorizedParquetValuesReader

public BaseVectorizedParquetValuesReader(int bitWidth,
                                         int maxDefLevel,
                                         boolean setValidityVector)

Method Detail

initFromPage

public void initFromPage(int valueCount,
                         org.apache.parquet.bytes.ByteBufferInputStream in)
                  throws java.io.IOException

Overrides:

initFromPage in class org.apache.parquet.column.values.ValuesReader

Throws:

java.io.IOException

readBoolean

public boolean readBoolean()

Overrides:

readBoolean in class org.apache.parquet.column.values.ValuesReader

skip

public void skip()

Specified by:

skip in class org.apache.parquet.column.values.ValuesReader

readValueDictionaryId

public int readValueDictionaryId()

Overrides:

readValueDictionaryId in class org.apache.parquet.column.values.ValuesReader

readInteger

public int readInteger()

Overrides:

readInteger in class org.apache.parquet.column.values.ValuesReader