org.apache.drill.exec.physical.resultSet.impl

Class TupleState.MapVectorState

java.lang.Object

org.apache.drill.exec.physical.resultSet.impl.TupleState.MapVectorState

All Implemented Interfaces:

VectorState

Enclosing class:

TupleState

public static class TupleState.MapVectorState
extends Object
implements VectorState

State for a map vector. If the map is repeated, it will have an offset vector. The map vector itself is a pseudo-vector that is simply a container for other vectors, and so needs no management itself.

Constructor Summary

Constructors

Constructor and Description
MapVectorState(AbstractMapVector mapVector, VectorState offsets)

Method Summary

Modifier and Type	Method and Description
int	allocate(int cardinality) Allocate a new vector with the number of elements given.
void	close() Clear the vector(s) associated with this state.
void	dump(HierarchicalFormatter format)
void	harvestWithLookAhead() A batch is being harvested after an overflow.
boolean	isProjected() Report whether this column is projected (has materialized vectors), or is unprojected (has no materialized backing.)
VectorState	offsetVectorState()
void	rollover(int cardinality) A vector has overflowed.
void	startBatchWithLookAhead() A new batch is starting while an look-ahead vector exists.
AbstractMapVector	vector() Underlying vector: the one presented to the consumer of the result set loader.

Methods inherited from class java.lang.Object

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

Constructor Detail

MapVectorState

public MapVectorState(AbstractMapVector mapVector,
                      VectorState offsets)

Method Detail

allocate

public int allocate(int cardinality)

Description copied from interface: VectorState

Allocate a new vector with the number of elements given. If the vector is an array, then the cardinality given is the number of arrays.

Specified by:

allocate in interface VectorState

Parameters:

cardinality - number of elements desired in the allocated vector

Returns:

the number of bytes allocated

rollover

public void rollover(int cardinality)

Description copied from interface: VectorState

A vector has overflowed. Create a new look-ahead vector of the given cardinality, then copy the overflow values from the main vector to the look-ahead vector.

Specified by:

rollover in interface VectorState

Parameters:

cardinality - the number of elements in the new vector. If this vector is an array, then this is the number of arrays

harvestWithLookAhead

public void harvestWithLookAhead()

Description copied from interface: VectorState

A batch is being harvested after an overflow. Put the full batch back into the main vector so it can be harvested.

Specified by:

harvestWithLookAhead in interface VectorState

startBatchWithLookAhead

public void startBatchWithLookAhead()

Description copied from interface: VectorState

A new batch is starting while an look-ahead vector exists. Move the look-ahead buffers into the main vector to prepare for writing the rest of the batch.

Specified by:

startBatchWithLookAhead in interface VectorState

close

public void close()

Description copied from interface: VectorState

Clear the vector(s) associated with this state.

Specified by:

close in interface VectorState

vector

public AbstractMapVector vector()

Description copied from interface: VectorState

Underlying vector: the one presented to the consumer of the result set loader.

Specified by:

vector in interface VectorState

offsetVectorState

public VectorState offsetVectorState()

isProjected

public boolean isProjected()

Description copied from interface: VectorState

Report whether this column is projected (has materialized vectors), or is unprojected (has no materialized backing.)

Specified by:

isProjected in interface VectorState

Returns:

true if the column is projected to the output, false if not

dump

public void dump(HierarchicalFormatter format)

Specified by:

dump in interface VectorState