How to use

createPrimaryIndexScanOp

method

in

org.apache.asterix.metadata.utils.DatasetUtil

private static void populateDataToRebalanceTarget(Dataset source, Dataset target, MetadataProvider metadataProvider,
    IHyracksClientConnection hcc) throws Exception {
  JobSpecification spec = new JobSpecification();
  TxnId txnId = metadataProvider.getTxnIdFactory().create();
  JobEventListenerFactory jobEventListenerFactory = new JobEventListenerFactory(txnId, true);
  spec.setJobletEventListenerFactory(jobEventListenerFactory);
  // The pipeline starter.
  IOperatorDescriptor starter = DatasetUtil.createDummyKeyProviderOp(spec, source, metadataProvider);
  // Creates primary index scan op.
  IOperatorDescriptor primaryScanOp = DatasetUtil.createPrimaryIndexScanOp(spec, metadataProvider, source);
  // Creates secondary BTree upsert op.
  IOperatorDescriptor upsertOp = createPrimaryIndexUpsertOp(spec, metadataProvider, source, target);
  // The final commit operator.
  IOperatorDescriptor commitOp = createUpsertCommitOp(spec, metadataProvider, target);
  // Connects empty-tuple-source and scan.
  spec.connect(new OneToOneConnectorDescriptor(spec), starter, 0, primaryScanOp, 0);
  // Connects scan and upsert.
  int numKeys = target.getPrimaryKeys().size();
  int[] keys = IntStream.range(0, numKeys).toArray();
  IConnectorDescriptor connectorDescriptor = new MToNPartitioningConnectorDescriptor(spec,
      new FieldHashPartitionComputerFactory(keys, target.getPrimaryHashFunctionFactories(metadataProvider)));
  spec.connect(connectorDescriptor, primaryScanOp, 0, upsertOp, 0);
  // Connects upsert and sink.
  spec.connect(new OneToOneConnectorDescriptor(spec), upsertOp, 0, commitOp, 0);
  // Executes the job.
  JobUtils.runJob(hcc, spec, true);
}

IOperatorDescriptor targetOp = DatasetUtil.createPrimaryIndexScanOp(spec, metadataProvider, dataset);
spec.connect(new OneToOneConnectorDescriptor(spec), sourceOp, 0, targetOp, 0);

IOperatorDescriptor primaryScanOp = DatasetUtil.createPrimaryIndexScanOp(spec, metadataProvider, dataset);

IOperatorDescriptor primaryScanOp = DatasetUtil.createPrimaryIndexScanOp(spec, metadataProvider, dataset);