Package org.apache.drill.exec.physical.resultSet.model.single

Class BuildVectorsFromMetadata

java.lang.Object

org.apache.drill.exec.physical.resultSet.model.single.BuildVectorsFromMetadata

public class BuildVectorsFromMetadata
extends Object

Build (materialize) as set of vectors based on a provided metadata schema. The vectors are bundled into a VectorContainer which is the end product of this builder.

Vectors are built recursively by walking the tree that defines a row's structure. For a classic relational tuple, the tree has just a root and a set of primitives. But, once we add array (repeated), variant (LIST, UNION) and tuple (MAP) columns, the tree grows quite complex.

Constructor Summary

Constructors

Constructor	Description
BuildVectorsFromMetadata(BufferAllocator allocator)

Method Summary

Modifier and Type	Method	Description
VectorContainer	build(TupleMetadata schema)

Methods inherited from class java.lang.Object

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

Constructor Details

BuildVectorsFromMetadata

public BuildVectorsFromMetadata(BufferAllocator allocator)

Method Details

build

public VectorContainer build(TupleMetadata schema)