nbauernfeind commented on issue #399:
URL: https://github.com/apache/arrow-java/issues/399#issuecomment-2644418271
This issue still persists.
Notably:
```java
@Override
public void setPosition(int index) {
super.setPosition(index);
for (BaseWriter writer : writers) {
writer.setPosition(index);
}
}
```
But, writers is an array of length 128 and each writer is lazily initialized
- in that every writer is `null`.
The result is that it is impossible to write Lists of Unions using this
library. Noting that `UnionListWriter#startList` invokes `setPosition`:
```java
@Override
public void startList() {
vector.startNewValue(idx());
writer.setPosition(vector.getOffsetBuffer().getInt((idx() + 1L) *
OFFSET_WIDTH));
listStarted = true;
}
```
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