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

Class DefaultReturnTypeInference

java.lang.Object

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

All Implemented Interfaces:

ReturnTypeInference

public class DefaultReturnTypeInference
extends Object
implements ReturnTypeInference

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

Field Summary

Fields

Modifier and Type	Field	Description
static final DefaultReturnTypeInference	INSTANCE

Constructor Summary

Constructors

Constructor	Description
DefaultReturnTypeInference()

Method Summary

Modifier and Type	Method	Description
TypeProtos.MajorType	getType(List<LogicalExpression> logicalExpressions, FunctionAttributes attributes)	Calculates return type and its nullability.

Methods inherited from class java.lang.Object

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

Field Details

INSTANCE

public static final DefaultReturnTypeInference INSTANCE

Constructor Details

DefaultReturnTypeInference

public DefaultReturnTypeInference()

Method Details

getType

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

Calculates return type and its nullability. Precision and scale is not included.

Specified by:

getType in interface ReturnTypeInference

Parameters:

logicalExpressions - logical expressions

attributes - function attributes

Returns:

return type