Package io.trino.parquet.reader.flat

Class NullsDecoder

java.lang.Object

io.trino.parquet.reader.flat.NullsDecoder

All Implemented Interfaces:

FlatDefinitionLevelDecoder

public class NullsDecoder
extends Object
implements FlatDefinitionLevelDecoder

The hybrid RLE/bit-packing encoding consists of multiple groups. Each group is either encoded as RLE or bit-packed

For a primitive column, the definition level is always either 0 (null) or 1 (non-null). Therefore, every value is decoded from a single bit and stored into a boolean array which stores false for non-null and true for null.

Nested Class Summary

Nested classes/interfaces inherited from interface io.trino.parquet.reader.flat.FlatDefinitionLevelDecoder

FlatDefinitionLevelDecoder.DefinitionLevelDecoderProvider

Constructor Summary

Constructors

Constructor	Description
NullsDecoder()

Method Summary

Modifier and Type	Method	Description
void	init(io.airlift.slice.Slice input)
int	readNext(boolean[] values, int offset, int length)	'values' array needs to be empty, i.e.
int	skip(int length)	Skip 'length' values and return the number of non-nulls encountered

Methods inherited from class java.lang.Object

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

Constructor Details

NullsDecoder

public NullsDecoder()

Method Details

init

public void init(io.airlift.slice.Slice input)

Specified by:

init in interface FlatDefinitionLevelDecoder

readNext

public int readNext(boolean[] values,
 int offset,
 int length)

'values' array needs to be empty, i.e. contain only false values.

Specified by:

readNext in interface FlatDefinitionLevelDecoder

skip

public int skip(int length)

Skip 'length' values and return the number of non-nulls encountered

Specified by:

skip in interface FlatDefinitionLevelDecoder