data.cacheFieldNames(data.outputRowMeta);
data.baseRowMeta = meta.isClearInputFields() ? data.emptyRowMeta : data.inputRowMeta;
// put the standard streams into ruby scope
data.container.put("$output", new StdStreamWriter(this));
data.container.put("$input", new StdStreamReader(this));
if (meta.getParentStepMeta().isDoingErrorHandling()) {
data.errorRowMeta = meta.getParentStepMeta().getStepErrorMeta().getErrorFields().clone();