Package io.deephaven.extensions.barrage.chunk.array

Interface ArrayExpansionKernel

All Known Implementing Classes:

BooleanArrayExpansionKernel, BoxedBooleanArrayExpansionKernel, ByteArrayExpansionKernel, CharArrayExpansionKernel, DoubleArrayExpansionKernel, FloatArrayExpansionKernel, IntArrayExpansionKernel, LongArrayExpansionKernel, ObjectArrayExpansionKernel, ShortArrayExpansionKernel

public interface ArrayExpansionKernel

Method Summary

Modifier and Type	Method	Description
<T, A extends Any> WritableObjectChunk<T,A>	contract(Chunk<A> source, IntChunk<ChunkPositions> perElementLengthDest, WritableChunk<A> outChunk, int outOffset, int totalRows)	This contracts the source from a pair of LongChunk and Chunk<T> and produces a Chunk<T[]>.
<T, A extends Any> WritableChunk<A>	expand(ObjectChunk<T,A> source, WritableIntChunk<ChunkPositions> perElementLengthDest)	This expands the source from a T[] per element to a flat T per element.
static ArrayExpansionKernel	makeExpansionKernel(ChunkType chunkType, Class<?> componentType)

Method Details

makeExpansionKernel

static ArrayExpansionKernel makeExpansionKernel(ChunkType chunkType,
 Class<?> componentType)

Returns:

a kernel that expands a Chunk<T[]> to pair of LongChunk, Chunk<T>

expand

<T,
A extends Any> WritableChunk<A> expand(ObjectChunk<T,A> source,
 WritableIntChunk<ChunkPositions> perElementLengthDest)

This expands the source from a T[] per element to a flat T per element. The kernel records the number of consecutive elements that belong to a row in perElementLengthDest. The returned chunk is owned by the caller.

Parameters:

source - the source chunk of T[] to expand

perElementLengthDest - the destination IntChunk for which dest.get(i + 1) - dest.get(i) is equivalent to source.get(i).length

Returns:

an unrolled/flattened chunk of T

contract

<T,
A extends Any> WritableObjectChunk<T,A> contract(Chunk<A> source,
 IntChunk<ChunkPositions> perElementLengthDest,
 WritableChunk<A> outChunk,
 int outOffset,
 int totalRows)

This contracts the source from a pair of LongChunk and Chunk<T> and produces a Chunk<T[]>. The returned chunk is owned by the caller.

Parameters:

source - the source chunk of T to contract

perElementLengthDest - the source IntChunk for which dest.get(i + 1) - dest.get(i) is equivalent to source.get(i).length

outChunk - the returned chunk from an earlier record batch

outOffset - the offset to start writing into outChunk

totalRows - the total known rows for this column; if known (else 0)

Returns:

a result chunk of T[]