Package org.apache.drill.exec.expr.fn

Class DrillSimpleFuncHolder

java.lang.Object

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

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

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

All Implemented Interfaces:

FuncHolder

Direct Known Subclasses:

DrillComplexWriterFuncHolder

public class DrillSimpleFuncHolder
extends DrillFuncHolder

Definition of a Drill function defined using the @FunctionTemplate annotation of the class which implements the function. Simple functions have input parameters as defined by member variables annotated with the @Param annotation.

Constructor Summary

Constructors

Constructor	Description
DrillSimpleFuncHolder(FunctionAttributes functionAttributes, FunctionInitializer initializer)

Method Summary

Modifier and Type	Method	Description
DrillSimpleFunc	createInterpreter()
protected ClassGenerator.HoldingContainer	generateEvalBody(ClassGenerator<?> g, 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	isNested()
ClassGenerator.HoldingContainer	renderEnd(ClassGenerator<?> classGenerator, ClassGenerator.HoldingContainer[] inputVariables, com.sun.codemodel.JVar[] workspaceJVars, FunctionHolderExpression holderExpr)	Render the various code blocks for a simple function.

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

addProtectedBlock, assignInjectableValue, checkNullHandling, 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

isComplexWriterFuncHolder, renderMiddle

Methods inherited from class java.lang.Object

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

Constructor Details

DrillSimpleFuncHolder

public DrillSimpleFuncHolder(FunctionAttributes functionAttributes,
 FunctionInitializer initializer)

Method Details

isNested

public boolean isNested()

Specified by:

isNested in interface FuncHolder

Overrides:

isNested in class AbstractFuncHolder

createInterpreter

public DrillSimpleFunc createInterpreter()
                                  throws Exception

Throws:

Exception

renderEnd

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

Render the various code blocks for a simple function.

Specified by:

renderEnd in class AbstractFuncHolder

Parameters:

classGenerator - code generator

inputVariables - value holder references for each input value. Variables are in the same order as the declared function parameters

workspaceJVars - internal working variables as declared with the @Workspece annotations. These are simple variables, not Drill value holders

holderExpr - the function call expression

Returns:

HoldingContainer for return value

generateEvalBody

protected ClassGenerator.HoldingContainer generateEvalBody(ClassGenerator<?> g,
 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.