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

Class TupleState.MapState

java.lang.Object

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

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

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

All Implemented Interfaces:

AbstractTupleWriter.TupleWriterListener

Direct Known Subclasses:

TupleState.DictState, TupleState.MapArrayState, TupleState.SingleMapState

Enclosing class:

TupleState

public abstract static class TupleState.MapState
extends TupleState

Represents a tuple defined as a Drill map: single or repeated. Note that the map vector does not exist here; it is assembled only when "harvesting" a batch. This design supports the obscure case in which a new column is added during an overflow row, so exists within this abstraction, but is not published to the map that makes up the output.

The map state is associated with a map vector. This vector is built either during harvest time (normal maps) or on the fly (union maps.)

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.drill.exec.physical.resultSet.impl.TupleState

TupleState.DictArrayState, TupleState.DictArrayVectorState, TupleState.DictColumnState, TupleState.DictState, TupleState.DictVectorState<T extends ValueVector>, TupleState.MapArrayState, TupleState.MapColumnState, TupleState.MapState, TupleState.MapVectorState, TupleState.RowState, TupleState.SingleDictState, TupleState.SingleDictVectorState, TupleState.SingleMapState

Field Summary

Fields inherited from class org.apache.drill.exec.physical.resultSet.impl.TupleState

columns, outputSchema, schema

Fields inherited from class org.apache.drill.exec.physical.resultSet.impl.ContainerState

loader, parentColumn, projectionSet, vectorCache

Constructor Summary

Constructors

Constructor and Description
MapState(org.apache.drill.exec.physical.resultSet.impl.LoaderInternals events, ResultVectorCache vectorCache, ProjectionFilter projectionSet)

Method Summary

Modifier and Type	Method and Description
protected void	addColumn(ColumnState colState)
int	addOutputColumn(ValueVector vector, ColumnMetadata colSchema)
void	bindColumnState(TupleState.MapColumnState colState)
void	dump(HierarchicalFormatter format)
int	innerCardinality()
protected boolean	isVersioned() A map is within a union if the map vector has been materialized.

Methods inherited from class org.apache.drill.exec.physical.resultSet.impl.TupleState

addColumn, addColumn, bindOutputSchema, columns, columnStates, hasProjections, isProjected, outputSchema, schema, updateOutput, writer

Methods inherited from class org.apache.drill.exec.physical.resultSet.impl.ContainerState

addColumn, bindColumnState, close, harvestWithLookAhead, loader, projection, rollover, startBatch, updateCardinality, vectorCache

Methods inherited from class java.lang.Object

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

Constructor Detail

MapState

public MapState(org.apache.drill.exec.physical.resultSet.impl.LoaderInternals events,
                ResultVectorCache vectorCache,
                ProjectionFilter projectionSet)

Method Detail

bindColumnState

public void bindColumnState(TupleState.MapColumnState colState)

addOutputColumn

public int addOutputColumn(ValueVector vector,
                           ColumnMetadata colSchema)

Specified by:

addOutputColumn in class TupleState

addColumn

protected void addColumn(ColumnState colState)

Overrides:

addColumn in class TupleState

isVersioned

protected boolean isVersioned()

A map is within a union if the map vector has been materialized. Top-level maps are built at harvest time. But, due to the complexity of unions, maps within unions are materialized. This method ensures that maps are materialized regardless of nesting depth within a union.

Specified by:

isVersioned in class ContainerState

Returns:

true if versioned

innerCardinality

public int innerCardinality()

Specified by:

innerCardinality in class ContainerState

dump

public void dump(HierarchicalFormatter format)

Overrides:

dump in class TupleState