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

Class StaticColumnLoader

java.lang.Object

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

Direct Known Subclasses:

ConstantColumnLoader, NullColumnLoader

public abstract class StaticColumnLoader
extends Object

Base class for columns that take values based on the reader, not individual rows. E.g. null columns (values are all null) or file metadata (AKA "implicit") columns that take values based on the file.

Field Summary

Fields

Modifier and Type	Field and Description
protected ResultSetLoader	loader
protected ResultVectorCache	vectorCache

Constructor Summary

Constructors

Constructor and Description
StaticColumnLoader(ResultVectorCache vectorCache)

Method Summary

Modifier and Type	Method and Description
void	close()
abstract VectorContainer	load(int rowCount) Populate static vectors with the defined static values.

Methods inherited from class java.lang.Object

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

Field Detail

loader

protected final ResultSetLoader loader

vectorCache

protected final ResultVectorCache vectorCache

Constructor Detail

StaticColumnLoader

public StaticColumnLoader(ResultVectorCache vectorCache)

Method Detail

load

public abstract VectorContainer load(int rowCount)

Populate static vectors with the defined static values.

Parameters:

rowCount - number of rows to generate. Must match the row count in the batch returned by the reader

close

public void close()