org.apache.druid.segment.transform

Class ExpressionTransform

java.lang.Object

org.apache.druid.segment.transform.ExpressionTransform

All Implemented Interfaces:

Transform

public class ExpressionTransform
extends Object
implements Transform

Constructor Summary

Constructors

Constructor and Description
ExpressionTransform(String name, String expression, ExprMacroTable macroTable)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
String	getExpression()
String	getName() Returns the field name for this transform.
Set<String>	getRequiredColumns() Returns the names of all columns that this transform is going to read.
RowFunction	getRowFunction() Returns the function for this transform.
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ExpressionTransform

public ExpressionTransform(String name,
                           String expression,
                           ExprMacroTable macroTable)

Method Detail

getName

public String getName()

Description copied from interface: Transform

Returns the field name for this transform.

Specified by:

getName in interface Transform

getExpression

public String getExpression()

getRowFunction

public RowFunction getRowFunction()

Description copied from interface: Transform

Returns the function for this transform. The RowFunction takes an entire row as input and returns a column value as output.

Specified by:

getRowFunction in interface Transform

getRequiredColumns

public Set<String> getRequiredColumns()

Description copied from interface: Transform

Returns the names of all columns that this transform is going to read.

Specified by:

getRequiredColumns in interface Transform

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object