Examples of org.apache.drill.exec.vector.NullableVarCharVector

org.apache.drill.exec.vector.NullableVarCharVector
NullableVarChar implements a vector of values which could be null. Elements in the vector are first checked against a fixed length vector of boolean values. Then the element is retrieved from the base class (if not null). NB: this class is automatically generated from ValueVectorTypes.tdd using FreeMarker.

    FunctionImplementationRegistry registry = new FunctionImplementationRegistry(c);
    FragmentContext context = new FragmentContext(bitContext, PlanFragment.getDefaultInstance(), connection, registry);
    SimpleRootExec exec = new SimpleRootExec(ImplCreator.getExec(context, (FragmentRoot) plan.getSortedOperators(false).iterator().next()));


    while(exec.next()){
      NullableVarCharVector c1 = exec.getValueVectorById(new SchemaPath("col3", ExpressionPosition.UNKNOWN), NullableVarCharVector.class);
      NullableVarCharVector.Accessor a1;
      a1 = c1.getAccessor();


      int count = 0;
      for(int i = 0; i < c1.getAccessor().getValueCount(); i++){
        if (!a1.isNull(i)) {
          NullableVarCharHolder holder = new NullableVarCharHolder();
          a1.get(i, holder);
          //when offset is negative, substring return empty string.
          assertEquals("", StringFunctionHelpers.toStringFromUTF8(holder.start,  holder.end,  holder.buffer));

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  }


  private void populatePartitionVectors() {
    for (int index = 0; index < selectedPartitionColumns.size(); index++) {
      int i = selectedPartitionColumns.get(index);
      NullableVarCharVector v = (NullableVarCharVector) partitionVectors.get(index);
      if (partitionValues.length > i) {
        String val = partitionValues[i];
        AllocationHelper.allocate(v, recordCount, val.length());
        byte[] bytes = val.getBytes();
        for (int j = 0; j < recordCount; j++) {
          v.getMutator().setSafe(j, bytes, 0, bytes.length);
        }
        v.getMutator().setValueCount(recordCount);
      } else {
        AllocationHelper.allocate(v, recordCount, 0);
        v.getMutator().setValueCount(recordCount);
      }
    }
  }

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    BufferAllocator allocator = new TopLevelAllocator();
    ValueVector fixedV = new IntVector(MaterializedField.create(new SchemaPath("ints", ExpressionPosition.UNKNOWN),
        Types.required(MinorType.INT)), allocator);
    ValueVector varlenV = new VarCharVector(MaterializedField.create(
        new SchemaPath("chars", ExpressionPosition.UNKNOWN), Types.required(MinorType.VARCHAR)), allocator);
    ValueVector nullableVarlenV = new NullableVarCharVector(MaterializedField.create(new SchemaPath("chars",
        ExpressionPosition.UNKNOWN), Types.optional(MinorType.VARCHAR)), allocator);


    List<ValueVector> vectors = Lists.newArrayList(fixedV, varlenV, nullableVarlenV);
    for (ValueVector v : vectors) {
      AllocationHelper.allocate(v, 100, 50);

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  }


  private void populatePartitionVectors() {
    for (int index = 0; index < selectedPartitionColumns.size(); index++) {
      int i = selectedPartitionColumns.get(index);
      NullableVarCharVector v = (NullableVarCharVector) partitionVectors.get(index);
      if (partitionValues.length > i) {
        String val = partitionValues[i];
        AllocationHelper.allocate(v, recordCount, val.length());
        byte[] bytes = val.getBytes();
        for (int j = 0; j < recordCount; j++) {
          v.getMutator().setSafe(j, bytes, 0, bytes.length);
        }
        v.getMutator().setValueCount(recordCount);
      } else {
        AllocationHelper.allocate(v, recordCount, 0);
        v.getMutator().setValueCount(recordCount);
      }
    }
  }

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