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 and Description
static DefaultReturnTypeInference	INSTANCE

Constructor Summary

Constructors

Constructor and Description
DefaultReturnTypeInference()

Method Summary

Methods

Modifier and Type	Method and 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 Detail

INSTANCE

public static final DefaultReturnTypeInference INSTANCE

Constructor Detail

DefaultReturnTypeInference

public DefaultReturnTypeInference()

Method Detail

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