lfygh opened a new issue, #205:
URL: https://github.com/apache/arrow-java/issues/205
```java
RootAllocator rootAllocator = new RootAllocator();
ListVector identity = ListVector.empty("identity", rootAllocator);
VectorSchemaRoot root = new VectorSchemaRoot(List.of(identity));
root.allocateNew();
UnionListWriter writer = identity.getWriter();
byte[] bytes1 = "hello1".getBytes(StandardCharsets.UTF_8);
ArrowBuf buffer = rootAllocator.buffer(bytes1.length);
buffer.setBytes(0,bytes1);
writer.startList();
writer.varChar().writeVarChar(0,bytes1.length,buffer);
writer.endList();
root.setRowCount(1);
System.out.println(root.contentToTSVString());
root.getFieldVectors().forEach(ValueVector::reset); //reset
fieldVector
byte[] bytes2 = "hello2".getBytes(StandardCharsets.UTF_8);
buffer.setBytes(0,bytes2);
writer.startList();
writer.varChar().writeVarChar(0,bytes2.length,buffer);
writer.endList();
root.setRowCount(1);
System.out.println(root.contentToTSVString());
```
the result is
```
identity
["hello1"]
identity
null
```
The above results are confusing。
The correct way is using the `writer.setPosition(index)`,
I don't know if it's a bug or other something.
### Component(s)
Java
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