@Override protected RelationPlan visitSampledRelation(SampledRelation node, Void context) { if (node.getColumnsToStratifyOn().isPresent()) { throw new UnsupportedOperationException("STRATIFY ON is not yet implemented"); } RelationPlan subPlan = process(node.getRelation(), context); TupleDescriptor outputDescriptor = analysis.getOutputDescriptor(node); double ratio = analysis.getSampleRatio(node); Symbol sampleWeightSymbol = null; if (node.getType() == SampledRelation.Type.POISSONIZED) { sampleWeightSymbol = symbolAllocator.newSymbol("$sampleWeight", BIGINT); } PlanNode planNode = new SampleNode( idAllocator.getNextId(), subPlan.getRoot(), ratio, SampleNode.Type.fromType(node.getType()), node.isRescaled(), Optional.ofNullable(sampleWeightSymbol)); return new RelationPlan( planNode, outputDescriptor, subPlan.getOutputSymbols(), Optional.ofNullable(sampleWeightSymbol)); }