Java Code Examples for org.apache.arrow.vector.complex.StructVector#empty()

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Example 1
Source File: HiveParquetCopierTest.java    From dremio-oss with Apache License 2.0 5 votes vote down vote up 
@Test
public void testStructCopier() {
  try (final StructVector s1 = StructVector.empty("s1", allocator);
       final StructVector s2 = StructVector.empty("s2", allocator)) {
    int rowcount = 5000;
    s1.addOrGet("struct_child", FieldType.nullable(Types.MinorType.INT.getType()), IntVector.class);
    s2.addOrGet("struct_child", FieldType.nullable(Types.MinorType.INT.getType()), IntVector.class);
    s1.allocateNew();
    BaseWriter.StructWriter structWriter = new NullableStructWriter(s1);
    IntWriter intWriter = structWriter.integer("struct_child");
    for(int i = 0; i<rowcount; i++) {
      if (i % 10 == 0) {
        continue;
      }
      structWriter.setPosition(i);
      structWriter.start();
      intWriter.writeInt(i);
      structWriter.end();
    }
    s1.setValueCount(rowcount);
    HiveParquetCopier.StructCopier structCopier = new HiveParquetCopier.StructCopier(s1, s2);
    structCopier.copyNonDataBufferRefs(rowcount);
    Assert.assertEquals(rowcount, s2.getValueCount());
    Assert.assertEquals(500, s1.getNullCount());
    Assert.assertEquals(500, s2.getNullCount());
    for(int i=0; i<rowcount; ++i) {
      Assert.assertEquals( i % 10 == 0, s2.isNull(i));
    }
  }
}