org.apache.drill.exec.expr.fn

Class AbstractFuncHolder

java.lang.Object

org.apache.drill.exec.expr.fn.AbstractFuncHolder

All Implemented Interfaces:

FuncHolder

Direct Known Subclasses:

DrillFuncHolder, HiveFuncHolder

public abstract class AbstractFuncHolder
extends Object
implements FuncHolder

Constructor Summary

Constructors

Constructor and Description
AbstractFuncHolder()

Method Summary

Modifier and Type	Method and Description
boolean	isComplexWriterFuncHolder() Checks that the current function holder stores output value using field writer instead of vector holder.
boolean	isNested()
abstract ClassGenerator.HoldingContainer	renderEnd(ClassGenerator<?> classGenerator, ClassGenerator.HoldingContainer[] inputVariables, com.sun.codemodel.JVar[] workspaceJVars, FunctionHolderExpression holderExpr) Generate methods body and complete the code generation.
void	renderMiddle(ClassGenerator<?> g, ClassGenerator.HoldingContainer[] inputVariables, com.sun.codemodel.JVar[] workspaceJVars)
abstract com.sun.codemodel.JVar[]	renderStart(ClassGenerator<?> g, ClassGenerator.HoldingContainer[] inputVariables, FieldReference fieldReference)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.drill.common.expression.fn.FuncHolder

getExpr, getParamCount, getParamMajorType

Constructor Detail

AbstractFuncHolder

public AbstractFuncHolder()

Method Detail

renderStart

public abstract com.sun.codemodel.JVar[] renderStart(ClassGenerator<?> g,
                                                     ClassGenerator.HoldingContainer[] inputVariables,
                                                     FieldReference fieldReference)

renderMiddle

public void renderMiddle(ClassGenerator<?> g,
                         ClassGenerator.HoldingContainer[] inputVariables,
                         com.sun.codemodel.JVar[] workspaceJVars)

renderEnd

public abstract ClassGenerator.HoldingContainer renderEnd(ClassGenerator<?> classGenerator,
                                                          ClassGenerator.HoldingContainer[] inputVariables,
                                                          com.sun.codemodel.JVar[] workspaceJVars,
                                                          FunctionHolderExpression holderExpr)

Generate methods body and complete the code generation.

Parameters:

classGenerator - the class responsible for code generation

inputVariables - the source of the vector holders

workspaceJVars - class fields

holderExpr - holder for the function expression

Returns:

HoldingContainer for return value

isNested

public boolean isNested()

Specified by:

isNested in interface FuncHolder

isComplexWriterFuncHolder

public boolean isComplexWriterFuncHolder()

Description copied from interface: FuncHolder

Checks that the current function holder stores output value using field writer instead of vector holder.

Specified by:

isComplexWriterFuncHolder in interface FuncHolder

Returns:

true if current function holder uses field writer to store the output value