Package org.apache.drill.exec.planner.sql.handlers

Class DropFunctionHandler

java.lang.Object

org.apache.drill.exec.planner.sql.handlers.AbstractSqlHandler

org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler

org.apache.drill.exec.planner.sql.handlers.DropFunctionHandler

public class DropFunctionHandler
extends DefaultSqlHandler

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler

DefaultSqlHandler.ConvertedRelNode, DefaultSqlHandler.MetaDataProviderModifier

Field Summary

Fields inherited from class org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler

config, context

Constructor Summary

Constructors

Constructor	Description
DropFunctionHandler(SqlHandlerConfig config)

Method Summary

Modifier and Type	Method	Description
PhysicalPlan	getPlan(org.apache.calcite.sql.SqlNode sqlNode)	Unregisters UDFs dynamically.

Methods inherited from class org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler

addRenamedProject, convertToDrel, convertToPlan, convertToPop, convertToPrel, convertToRawDrel, getPops, log, log, log, logAndSetTextPlan, rewrite, transform, transform, validateAndConvert, validateNode

Methods inherited from class org.apache.drill.exec.planner.sql.handlers.AbstractSqlHandler

unwrap

Methods inherited from class java.lang.Object

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

Constructor Details

DropFunctionHandler

public DropFunctionHandler(SqlHandlerConfig config)

Method Details

getPlan

public PhysicalPlan getPlan(org.apache.calcite.sql.SqlNode sqlNode)
                     throws ForemanSetupException,
IOException

Unregisters UDFs dynamically. Process consists of several steps:

1. Registering jar in jar registry to ensure that several jars with the same name is not being unregistered.
2. Starts remote unregistration process, gets list of all jars and excludes jar to be deleted.
3. Signals drill bits to start local unregistration process.
4. Removes source and binary jars from registry area.

UDFs unregistration is allowed only if dynamic UDFs support is enabled. Only jars registered dynamically can be unregistered, built-in functions loaded at start up are not allowed to be unregistered. Limitation: before jar unregistration make sure no one is using functions from this jar. There is no guarantee that running queries will finish successfully or give correct result.

Overrides:

getPlan in class DefaultSqlHandler

Returns:

- Single row indicating list of unregistered UDFs, raise exception otherwise

Throws:

ForemanSetupException

IOException