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

Class HiveFunctionRegistry

java.lang.Object

org.apache.drill.exec.expr.fn.HiveFunctionRegistry

All Implemented Interfaces:

PluggableFunctionRegistry

public class HiveFunctionRegistry
extends Object
implements PluggableFunctionRegistry

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	HiveFunctionRegistry.HiveSqlReturnTypeInference

Constructor Summary

Constructors

Constructor	Description
HiveFunctionRegistry(DrillConfig config)	Scan the classpath for implementation of GenericUDF/UDF interfaces, extracts function annotation and store the (function name) --> (implementation class) mappings.

Method Summary

Modifier and Type	Method	Description
HiveFuncHolder	getFunction(FunctionCall call)	Find the UDF class for given function name and check if it accepts the given input argument types.
void	register(DrillOperatorTable operatorTable)	Register functions in given operator table.

Methods inherited from class java.lang.Object

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

Constructor Details

HiveFunctionRegistry

public HiveFunctionRegistry(DrillConfig config)

Scan the classpath for implementation of GenericUDF/UDF interfaces, extracts function annotation and store the (function name) --> (implementation class) mappings.

Parameters:

config -

Method Details

register

public void register(DrillOperatorTable operatorTable)

Description copied from interface: PluggableFunctionRegistry

Register functions in given operator table. There are two methods to add operators. One is addOperatorWithInference whose added operators will be used when planner.type_inference.enable is set to true; The other is addOperatorWithoutInference whose added operators will be used when planner.type_inference.enable is set to false;

Specified by:

register in interface PluggableFunctionRegistry

getFunction

public HiveFuncHolder getFunction(FunctionCall call)

Find the UDF class for given function name and check if it accepts the given input argument types. If a match is found, create a holder and return

Specified by:

getFunction in interface PluggableFunctionRegistry

Parameters:

call -

Returns: