Kooooooma opened a new issue, #14310:
URL: https://github.com/apache/iceberg/issues/14310
### Apache Iceberg version
1.10.0 (latest release)
### Query engine
None
### Please describe the bug 🐞
Source code in org.apache.iceberg.io.DataWriter.hava
```java
public void close() throws IOException {
if (dataFile == null) {
appender.close();
this.dataFile =
DataFiles.builder(spec)
.withFormat(format)
.withPath(location)
.withPartition(partition)
.withEncryptionKeyMetadata(keyMetadata)
.withFileSizeInBytes(appender.length())
.withMetrics(appender.metrics())
.withSplitOffsets(appender.splitOffsets())
.withSortOrder(sortOrder)
.build();
}
}
```
My application code is like
```java
DataWriter writer = Parquet.writeData(outputFile).forTable(table).build();
writer.write(record);
writer.close(); // NPE happened here
```
Seems in above close function, first we closed the appender and in
**appender.close() function set its writer to null**, but then when we build
the DataFile and try to call the appender.length() function, it's directly call
the writer.getDatasize() function, so the NPE was occurred.
### Willingness to contribute
- [ ] I can contribute a fix for this bug independently
- [x] I would be willing to contribute a fix for this bug with guidance from
the Iceberg community
- [ ] I cannot contribute a fix for this bug at this time
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