transform-function-python.md
The TransformFunction API provides the following methods for extension by subclasses:
def setup(self, server_interface, col_types)
def processPartition(self, server_interface, partition_reader, partition_writer)
def destroy(self, server_interface, col_types)
The PartitionReader
and PartitionWriter
classes provide getters and setters for column values, along with next()
to iterate through partitions. See the API reference documentation for details.