nbauernfeind opened a new issue, #585:
URL: https://github.com/apache/arrow-java/issues/585
### Describe the bug, including details regarding any error messages,
version, and platform.
UnionListWriter's impl:
```java
@Override
public void startList() {
vector.startNewValue(idx());
writer.setPosition(vector.getOffsetBuffer().getInt((idx() + 1L) *
OFFSET_WIDTH));
listStarted = true;
}
```
Whereas UnionLargeListViewWriter:
```java
@Override
public void startList() {
vector.startNewValue(idx());
writer.setPosition(vector.getOffsetBuffer().getInt((idx()) *
OFFSET_WIDTH));
listStarted = true;
}
```
Note that the issue is that `UnionListWriter` fetches the offset of `idx() +
1` -- not the offset of `idx()` like the Large impl.
Also note that `startNewValue` returns the position that the writer can be
set to; we don't need to poke into the offset buffer.
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