Package org.apache.drill.exec.physical.impl.scan.project

Class ResolvedMapColumn

java.lang.Object

org.apache.drill.exec.physical.impl.scan.project.ResolvedColumn

org.apache.drill.exec.physical.impl.scan.project.ResolvedMapColumn

All Implemented Interfaces:

ColumnProjection

public class ResolvedMapColumn
extends ResolvedColumn

Represents a column which is implicitly a map (because it has children in the project list), but which does not match any column in the table. This kind of column gives rise to a map of null columns in the output.

Constructor Summary

Constructors

Constructor	Description
ResolvedMapColumn(ResolvedTuple parent, String name)
ResolvedMapColumn(ResolvedTuple parent, MaterializedField schema, int sourceIndex)

Method Summary

Modifier and Type	Method	Description
ResolvedTuple	members()
String	name()	The name of the column as it appears in the output row (record batch.)
ResolvedTuple	parent()
void	project(ResolvedTuple dest)
MaterializedField	schema()	Return the type of this column.

Methods inherited from class org.apache.drill.exec.physical.impl.scan.project.ResolvedColumn

metadata, source, sourceIndex

Methods inherited from class java.lang.Object

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

Constructor Details

ResolvedMapColumn

public ResolvedMapColumn(ResolvedTuple parent,
 String name)

ResolvedMapColumn

public ResolvedMapColumn(ResolvedTuple parent,
 MaterializedField schema,
 int sourceIndex)

Method Details

parent

public ResolvedTuple parent()

name

public String name()

Description copied from interface: ColumnProjection

The name of the column as it appears in the output row (record batch.)

Returns:

the output column name

members

public ResolvedTuple members()

project

public void project(ResolvedTuple dest)

Overrides:

project in class ResolvedColumn

schema

public MaterializedField schema()

Description copied from class: ResolvedColumn

Return the type of this column. Used primarily by the schema smoothing mechanism.

Specified by:

schema in class ResolvedColumn

Returns:

the MaterializedField representation of this column