felixYyu commented on PR #4702:
URL: https://github.com/apache/iceberg/pull/4702#issuecomment-1120079951
Refer to other writing methods, Possible NPE risks, I think we should try to
avoid it.
e.g. AvroFileAppender
```
@Override
public void close() throws IOException {
if (writer != null) {
writer.close();
this.writer = null;
isClosed = true;
}
}
```
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