Package org.apache.pinot.segment.local.function

Class InbuiltFunctionEvaluator

java.lang.Object

org.apache.pinot.segment.local.function.InbuiltFunctionEvaluator

All Implemented Interfaces:

FunctionEvaluator

public class InbuiltFunctionEvaluator
extends Object
implements FunctionEvaluator

Evaluates an expression.

This is optimized for evaluating an expression multiple times with different inputs.

Overall idea: parse the expression into an ExecutableNode, where an ExecutableNode can be:

• FunctionNode - executes a function
• ColumnNode - fetches the value of the column from the input GenericRow
• ConstantNode - returns the literal value

Constructor Summary

Constructors

Constructor	Description
InbuiltFunctionEvaluator(String functionExpression)

Method Summary

Modifier and Type	Method	Description
Object	evaluate(Object[] values)	Evaluates the function on the given values (same order as the arguments) and returns the result.
Object	evaluate(GenericRow row)	Evaluate the function on the generic row and return the result
List<String>	getArguments()	Get the arguments of the function

Methods inherited from class java.lang.Object

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

Constructor Detail

InbuiltFunctionEvaluator

public InbuiltFunctionEvaluator(String functionExpression)

Method Detail

getArguments

public List<String> getArguments()

Description copied from interface: FunctionEvaluator

Get the arguments of the function

Specified by:

getArguments in interface FunctionEvaluator

evaluate

public Object evaluate(GenericRow row)

Description copied from interface: FunctionEvaluator

Evaluate the function on the generic row and return the result

Specified by:

evaluate in interface FunctionEvaluator

evaluate

public Object evaluate(Object[] values)

Description copied from interface: FunctionEvaluator

Evaluates the function on the given values (same order as the arguments) and returns the result.

Specified by:

evaluate in interface FunctionEvaluator