Module org.elasticsearch.server

Package org.elasticsearch.index.mapper

Interface BlockLoader.ColumnAtATimeReader

All Superinterfaces:

AutoCloseable, BlockLoader.Reader, Closeable, Releasable

All Known Implementing Classes:

AbstractBooleansBlockLoader.Singleton, AbstractBytesRefsFromOrdsBlockLoader.Singleton, AbstractBytesRefsFromOrdsBlockLoader.SortedSet, AbstractDoublesFromDocValuesBlockLoader.Singleton, AbstractDoublesFromDocValuesBlockLoader.Sorted, AbstractIntsFromDocValuesBlockLoader.Singleton, AbstractIntsFromDocValuesBlockLoader.Sorted, AbstractLongsFromDocValuesBlockLoader.Singleton, AbstractLongsFromDocValuesBlockLoader.Sorted, BlockDocValuesReader, BytesRefsFromBinaryBlockLoader.BytesRefsFromBinary, BytesRefsFromCustomBinaryBlockLoader.AbstractBytesRefsFromBinary, MultiValuedBinaryWithSeparateCountsLengthReader

Enclosing interface:

BlockLoader

public static interface BlockLoader.ColumnAtATimeReader
extends BlockLoader.Reader

Load an entire block at a time.

It's important that these have a nice BlockLoader.Reader.toString(). It's used in the profile.

Method Summary

Modifier and Type	Method	Description
BlockLoader.Block	read(BlockLoader.BlockFactory factory, BlockLoader.Docs docs, int offset, boolean nullsFiltered)	Reads the values of all documents in docs.

Methods inherited from interface org.elasticsearch.index.mapper.BlockLoader.Reader

canReuse, toString

Methods inherited from interface org.elasticsearch.core.Releasable

close

Method Details

read

BlockLoader.Block read(BlockLoader.BlockFactory factory,
 BlockLoader.Docs docs,
 int offset,
 boolean nullsFiltered)
                throws IOException

Reads the values of all documents in docs.

Parameters:

nullsFiltered - if true, then target docs are guaranteed to have a value for the field; otherwise, the guarantee is unknown. This enables optimizations for block loaders, treating the field as dense (every document has value) even if it is sparse in the index. For example, "FROM index | WHERE x != null | STATS sum(x)", after filtering out documents without value for field x, all target documents returned from the source operator will have a value for field x whether x is dense or sparse in the index.

Throws:

IOException