Identifies the column by which the dataset is grouped for purposes of applying the transform.
groupparameter can result in non-deterministic re-ordering in the data grid. However, if you're running your job on the Spark running environment, you should apply the
groupparameter, or your job may run out of memory and fail. To avoid this issue and to enforce row ordering, use the
sorttransform. For more information, see Sort Transform.
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