org.apache.drill.exec.expr.fn

Class DrillComplexWriterFuncHolder

java.lang.Object

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

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

org.apache.drill.exec.expr.fn.DrillSimpleFuncHolder

org.apache.drill.exec.expr.fn.DrillComplexWriterFuncHolder

All Implemented Interfaces:

FuncHolder

public class DrillComplexWriterFuncHolder
extends DrillSimpleFuncHolder

Constructor Summary

Constructors

Constructor and Description
DrillComplexWriterFuncHolder(FunctionAttributes functionAttributes, FunctionInitializer initializer)

Method Summary

Modifier and Type	Method and Description
protected void	checkNullHandling(FunctionTemplate.NullHandling nullHandling) Check if function type supports provided null handling strategy.
protected ClassGenerator.HoldingContainer	generateEvalBody(ClassGenerator<?> classGenerator, ClassGenerator.HoldingContainer[] inputVariables, String body, com.sun.codemodel.JVar[] workspaceJVars, FunctionHolderExpression holderExpr) Generate the eval block for a simple function, including the null-handling wrapper, if requested.
boolean	isComplexWriterFuncHolder() Checks that the current function holder stores output value using field writer instead of vector holder.

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

createInterpreter, isNested, renderEnd

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

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

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

renderMiddle

Methods inherited from class java.lang.Object

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

Constructor Detail

DrillComplexWriterFuncHolder

public DrillComplexWriterFuncHolder(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

generateEvalBody

protected ClassGenerator.HoldingContainer generateEvalBody(ClassGenerator<?> classGenerator,
                                                           ClassGenerator.HoldingContainer[] inputVariables,
                                                           String body,
                                                           com.sun.codemodel.JVar[] workspaceJVars,
                                                           FunctionHolderExpression holderExpr)

Description copied from class: DrillSimpleFuncHolder

Generate the eval block for a simple function, including the null-handling wrapper, if requested.

Overrides:

generateEvalBody in class DrillSimpleFuncHolder

See Also:

#generateBody()}

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.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