org.apache.drill.exec.expr.fn

Class DrillComplexWriterAggFuncHolder

java.lang.Object

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

org.apache.drill.exec.expr.fn.DrillFuncHolder

org.apache.drill.exec.expr.fn.DrillComplexWriterAggFuncHolder

All Implemented Interfaces:

FuncHolder

public class DrillComplexWriterAggFuncHolder
extends DrillFuncHolder

Constructor Summary

Constructors

Constructor and Description
DrillComplexWriterAggFuncHolder(FunctionAttributes functionAttributes, FunctionInitializer initializer)

Method Summary

Modifier and Type	Method and Description
protected String	add()
protected void	addProtectedBlock(ClassGenerator<?> g, com.sun.codemodel.JBlock sub, String body, ClassGenerator.HoldingContainer[] inputVariables, com.sun.codemodel.JVar[] workspaceJVars, boolean decConstantInputOnly) Generate the function block itself, without surrounding comments, and whether or not the method is empty.
protected void	checkNullHandling(FunctionTemplate.NullHandling nullHandling) Check if function type supports provided null handling strategy.
protected String	cleanup()
boolean	isAggregating()
boolean	isComplexWriterFuncHolder() Checks that the current function holder stores output value using field writer instead of vector holder.
boolean	isNested()
protected String	output()
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<?> classGenerator, ClassGenerator.HoldingContainer[] inputVariables, com.sun.codemodel.JVar[] workspaceJVars)
com.sun.codemodel.JVar[]	renderStart(ClassGenerator<?> classGenerator, ClassGenerator.HoldingContainer[] inputVariables, FieldReference fieldReference)
protected String	reset()
protected String	setup()

Methods inherited from class org.apache.drill.exec.expr.fn.DrillFuncHolder

assignInjectableValue, checkPrecisionRange, declare, declareInputVariable, declareVarArgArray, declareWorkspaceVariables, generateBody, getAttributeParameter, getClassLoader, getCostCategory, getExpr, getInputParameters, getNullHandling, getOutputWidthCalculator, getParamCount, getParameters, getParamMajorType, getRegisteredNames, getReturnType, getReturnType, getReturnValue, getWorkspaceVars, isConstant, isDeterministic, isFieldReader, isInternal, isNiladic, isVarArg, matches, meth, meth, toString, variableOutputSizeEstimate

Methods inherited from class java.lang.Object

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

Constructor Detail

DrillComplexWriterAggFuncHolder

public DrillComplexWriterAggFuncHolder(FunctionAttributes functionAttributes,
                                       FunctionInitializer initializer)

Method Detail

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

Overrides:

isComplexWriterFuncHolder in class AbstractFuncHolder

Returns:

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

renderStart

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

renderMiddle

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

renderEnd

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

Description copied from class: AbstractFuncHolder

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

setup

protected String setup()

reset

protected String reset()

add

protected String add()

output

protected String output()

cleanup

protected String cleanup()

isNested

public boolean isNested()

Specified by:

isNested in interface FuncHolder

Overrides:

isNested in class AbstractFuncHolder

isAggregating

public boolean isAggregating()

Overrides:

isAggregating in class DrillFuncHolder

addProtectedBlock

protected void addProtectedBlock(ClassGenerator<?> g,
                                 com.sun.codemodel.JBlock sub,
                                 String body,
                                 ClassGenerator.HoldingContainer[] inputVariables,
                                 com.sun.codemodel.JVar[] workspaceJVars,
                                 boolean decConstantInputOnly)

Description copied from class: DrillFuncHolder

Generate the function block itself, without surrounding comments, and whether or not the method is empty.

Overrides:

addProtectedBlock in class DrillFuncHolder

checkNullHandling

protected void checkNullHandling(FunctionTemplate.NullHandling nullHandling)

Description copied from class: DrillFuncHolder

Check if function type supports provided null handling strategy.

Keep in mind that this method is invoked in DrillFuncHolder(FunctionAttributes, FunctionInitializer) constructor so make sure not to use any state fields when overriding the method to avoid uninitialized state.

Overrides:

checkNullHandling in class DrillFuncHolder

Parameters:

nullHandling - null handling strategy defined for a function