org.apache.drill.exec.expr.fn

Class HiveFuncHolder

java.lang.Object

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

org.apache.drill.exec.expr.fn.HiveFuncHolder

All Implemented Interfaces:

FuncHolder

public class HiveFuncHolder
extends AbstractFuncHolder

Constructor Summary

Constructors

Constructor and Description
HiveFuncHolder(Class<? extends org.apache.hadoop.hive.ql.udf.generic.GenericUDF> genericUdfClazz, TypeProtos.MajorType[] argTypes, org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector returnOI, TypeProtos.MajorType returnType, boolean isRandom) Create holder for GenericUDF
HiveFuncHolder(String udfName, Class<? extends org.apache.hadoop.hive.ql.exec.UDF> udfClazz, TypeProtos.MajorType[] argTypes, org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector returnOI, TypeProtos.MajorType returnType, boolean isRandom) Create holder for UDF

Method Summary

Modifier and Type	Method and Description
FunctionHolderExpression	getExpr(String name, List<LogicalExpression> args, ExpressionPosition pos) Return a reference to this function given a function alias and a list of actual arguments.
int	getParamCount() Number of defined input parameters.
TypeProtos.MajorType	getParamMajorType(int i) Drill SQL type of an input parameter.
TypeProtos.MajorType	getReturnType() UDF return type
boolean	isAggregating() Aggregate function
boolean	isRandom() is the function non-deterministic?
ClassGenerator.HoldingContainer	renderEnd(ClassGenerator<?> classGenerator, ClassGenerator.HoldingContainer[] inputVariables, com.sun.codemodel.JVar[] workspaceJVars, FunctionHolderExpression holderExpr) Generate methods body and complete the code generation.
com.sun.codemodel.JVar[]	renderStart(ClassGenerator<?> g, ClassGenerator.HoldingContainer[] inputVariables, FieldReference fieldReference) Start generating code

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

isComplexWriterFuncHolder, isNested, renderMiddle

Methods inherited from class java.lang.Object

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

Constructor Detail

HiveFuncHolder

public HiveFuncHolder(Class<? extends org.apache.hadoop.hive.ql.udf.generic.GenericUDF> genericUdfClazz,
                      TypeProtos.MajorType[] argTypes,
                      org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector returnOI,
                      TypeProtos.MajorType returnType,
                      boolean isRandom)

Create holder for GenericUDF

Parameters:

genericUdfClazz - implementation class

argTypes -

returnOI -

returnType -

HiveFuncHolder

public HiveFuncHolder(String udfName,
                      Class<? extends org.apache.hadoop.hive.ql.exec.UDF> udfClazz,
                      TypeProtos.MajorType[] argTypes,
                      org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector returnOI,
                      TypeProtos.MajorType returnType,
                      boolean isRandom)

Create holder for UDF

Parameters:

udfName - name of the UDF class

udfClazz - UDF implementation class

argTypes -

returnOI -

returnType -

Method Detail

getReturnType

public TypeProtos.MajorType getReturnType()

UDF return type

isAggregating

public boolean isAggregating()

Aggregate function

isRandom

public boolean isRandom()

is the function non-deterministic?

getParamMajorType

public TypeProtos.MajorType getParamMajorType(int i)

Description copied from interface: FuncHolder

Drill SQL type of an input parameter.

getParamCount

public int getParamCount()

Description copied from interface: FuncHolder

Number of defined input parameters.

renderStart

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

Start generating code

Specified by:

renderStart in class AbstractFuncHolder

Returns:

workspace variables

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.

Specified by:

renderEnd in class AbstractFuncHolder

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

getExpr

public FunctionHolderExpression getExpr(String name,
                                        List<LogicalExpression> args,
                                        ExpressionPosition pos)

Description copied from interface: FuncHolder

Return a reference to this function given a function alias and a list of actual arguments.

Parameters:

name - alias used in this specific call

args - expressions of the actual function arguments

Returns:

an expression that holds the function definition (this object), actual parameters and related information