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

Class ConcatReturnTypeInference

java.lang.Object

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

All Implemented Interfaces:

ReturnTypeInference

public class ConcatReturnTypeInference
extends Object
implements ReturnTypeInference

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

Field Summary

Fields

Modifier and Type	Field and Description
static ConcatReturnTypeInference	INSTANCE

Constructor Summary

Constructors

Constructor and Description
ConcatReturnTypeInference()

Method Summary

Methods

Modifier and Type	Method and Description
TypeProtos.MajorType	getType(List<LogicalExpression> logicalExpressions, FunctionAttributes attributes) Defines function return type and sets precision if it can be calculated.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final ConcatReturnTypeInference INSTANCE

Constructor Detail

ConcatReturnTypeInference

public ConcatReturnTypeInference()

Method Detail

getType

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

Defines function return type and sets precision if it can be calculated. Return type precision is sum of input types precisions. If at least one input type does not have precision, return type will be without precision. If calculated precision is greater than Types.MAX_VARCHAR_LENGTH, it is replaced with Types.MAX_VARCHAR_LENGTH.

Specified by:

getType in interface ReturnTypeInference

Parameters:

logicalExpressions - logical expressions

attributes - function attributes

Returns:

return type