passthroughTR

passthroughTR Transformer

Purpose

This transformer does ... nothing. However it couls be used when it's needed to change the Dataset name (id) or when no transformation is needed between one or several extraction and one or more loadings.

It works in a very simple way:

• It accepts many datasets in input.
• If one dataset is specified in input it must have a corresponding (same order) dataset in output. Said differently the configuration must have the same number of dataset in input and in output.

Configuration by using the SQL directly in the configuration file

The specific configuration (as a Datasource) in the configuration file section parameters inclues the following parameters:

• inputs: List of dataset ids in an array
• outputs : List of dataset ids in an array

Configuration example:

    "transformers":  [
    { 
        "id": "T1",
        "classname": "pipelite.transformers.passthroughTR",
        "inputs" : [ "S1", "S2" ],
        "outputs" : [ "O1", "O2" ]
    }
    ... ] ...