This method is called by Mobius.
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{ Dataset aDataset = this.datasets[assignedDatasetID]; if( aColumn.getDataset().equals(aDataset) ) { JobSetup.validateColumns(aDataset, aColumn); Configuration aJobConf = aDataset.createJobConf(assignedDatasetID); this.jobConf = Util.merge(this.jobConf, aJobConf); joinKeyPropertyName = assignedDatasetID+".key.columns"; break; } }