Java SDK Documentation  8.1
com.vertica.sdk.TransformFunction Class Referenceabstract

Interface for User-Defined Transform Function (UDTF). A UDTF operates on a table segment and returns zero or more rows of data. More...

Inheritance diagram for com.vertica.sdk.TransformFunction:
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Public Member Functions

void cancel (ServerInterface srvInterface)
 
void destroy (ServerInterface srvInterface, SizedColumnTypes argTypes)
 
void destroy (ServerInterface srvInterface, SizedColumnTypes argTypes, SessionParamWriterMap udSessionParams)
 
boolean isCanceled ()
 
abstract void processPartition (ServerInterface srvInterface, PartitionReader input_reader, PartitionWriter input_writer) throws UdfException, DestroyInvocation
 
void setup (ServerInterface srvInterface, SizedColumnTypes argTypes)
 

Detailed Description

Interface for User-Defined Transform Function (UDTF). A UDTF operates on a table segment and returns zero or more rows of data.

UDTFs can only be used in the SELECT list of a query. UDTFs are cancelable.

A TransformFunction must have an associated TransformFunctionFactory.

Member Function Documentation

void com.vertica.sdk.UDXObjectCancelable.cancel ( ServerInterface  srvInterface)
inherited

This function is invoked from a different thread when the execution is canceled This baseclass cancel should be called in any override.

void com.vertica.sdk.UDXObject.destroy ( ServerInterface  srvInterface,
SizedColumnTypes  argTypes 
)
inherited

Perform per instance destruction. This function may throw errors

Referenced by com.vertica.sdk.UDXObject.destroy().

void com.vertica.sdk.UDXObject.destroy ( ServerInterface  srvInterface,
SizedColumnTypes  argTypes,
SessionParamWriterMap  udSessionParams 
)
inherited

Perform per instance destruction and write session parameters to be used by UDxs that are invoked after this one returns. This function may throw errors

boolean com.vertica.sdk.UDXObjectCancelable.isCanceled ( )
inherited

Returns true if execution was canceled.

abstract void com.vertica.sdk.TransformFunction.processPartition ( ServerInterface  srvInterface,
PartitionReader  input_reader,
PartitionWriter  input_writer 
) throws UdfException, DestroyInvocation
abstract

Invoke a user defined transform on a set of rows. As the name suggests, a batch of rows are passed in for every invocation to amortize performance.

Parameters
srvInterfacea ServerInterface object used to communicate with Vertica
input_readerinput rows
output_writeroutput location
void com.vertica.sdk.UDXObject.setup ( ServerInterface  srvInterface,
SizedColumnTypes  argTypes 
)
inherited

Perform per instance initialization. This function may throw errors.