Fix Step.process_applying_mappings
#453
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Description
This PR fixes an issue with the
process_applying_mappingsmethod, as it was not properly applying theoutput_mappings, so the resulting columns were not properly renamed forStepsubclasses.Note
While
input_mappingsoperates atSteplevel and does not rename the output,output_mappingsoperates at global level meaning that theStepwill propagate the outputs with the renames applied, while the input ones will be reverted before propagating the inputs and outputs.