org.apache.drill.exec.physical.impl.scan.v3.schema

Class MutableTupleSchema.ColumnHandle

java.lang.Object

org.apache.drill.exec.physical.impl.scan.v3.schema.MutableTupleSchema.ColumnHandle

Enclosing class:

MutableTupleSchema

public static class MutableTupleSchema.ColumnHandle
extends Object

Holder for a column to allow inserting and replacing columns within the top-level project list. Changes to the column within the holder must go through the tuple itself so we can track schema versions.

Tracks the resolution status of each individual column as described for ScanSchemaTracker. Models a column throughout the projection lifecycle. Columns evolve from unresolved to resolved at different times. Columns are either implicit (defined by the framework) or normal (defined by the reader). Columns can be defined by the planner (via a defined schema), partially defined (via a provided schema), or discovered by the reader. Regardless of the path to definition, by the time the first batch is delivered downstream, each column has an output schema which describes the data.

Constructor Summary

Constructors

Constructor and Description
ColumnHandle(ColumnMetadata col)

Method Summary

Modifier and Type	Method and Description
ColumnMetadata	column()
boolean	isImplicit()
void	markImplicit(ImplicitColumnMarker marker)
String	name()
void	setIndex(int index)
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnHandle

public ColumnHandle(ColumnMetadata col)

Method Detail

name

public String name()

markImplicit

public void markImplicit(ImplicitColumnMarker marker)

column

public ColumnMetadata column()

isImplicit

public boolean isImplicit()

setIndex

public void setIndex(int index)

toString

public String toString()

Overrides:

toString in class Object