Package org.apache.drill.exec.expr.fn.output

Class PadReturnTypeInference

java.lang.Object

org.apache.drill.exec.expr.fn.output.PadReturnTypeInference

All Implemented Interfaces:

ReturnTypeInference

public class PadReturnTypeInference
extends Object
implements ReturnTypeInference

Return type calculation implementation for functions with return type set as FunctionTemplate.ReturnType.PAD.

Field Summary

Fields

Modifier and Type	Field	Description
static final PadReturnTypeInference	INSTANCE

Constructor Summary

Constructors

Constructor	Description
PadReturnTypeInference()

Method Summary

Modifier and Type	Method	Description
TypeProtos.MajorType	getType(List<LogicalExpression> logicalExpressions, FunctionAttributes attributes)	Defines function return type and sets precision if it pad length parameter is int expression.

Methods inherited from class java.lang.Object

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

Field Details

INSTANCE

public static final PadReturnTypeInference INSTANCE

Constructor Details

PadReturnTypeInference

public PadReturnTypeInference()

Method Details

getType

public TypeProtos.MajorType getType(List<LogicalExpression> logicalExpressions,
 FunctionAttributes attributes)

Defines function return type and sets precision if it pad length parameter is int expression. If pad length is less than zero, return type precision is 0.

Specified by:

getType in interface ReturnTypeInference

Parameters:

logicalExpressions - logical expressions

attributes - function attributes

Returns:

return type