robinsinghstudios opened a new issue, #9653:
URL: https://github.com/apache/iceberg/issues/9653
### Query engine
Iceberg Java API 1.4.3
### Question
For context, I am new to Java and might be missing something simple but,
after being stuck on this issue for a long while, I decided to post my question
here.
I am using Iceberg 1.4.3 and Java 20.
While using Iceberg's PartitionedFanoutWriter, I am able to dynamically
generate the partitions and write the files successfully in the respective
partitions. However, when I try to read the data, the partition column values
are always null.
My code looks like this:
```
org.apache.iceberg.Table table;
PartitionSpec spec;
SortOrder srt;
if (catalog.tableExists(name)) {
table = catalog.loadTable(name);
}
else {
spec = PartitionSpec.builderFor(schema)
.identity("temp")
.build();
srt = SortOrder.builderFor(schema)
.asc(keyColumn)
.build();
Map<String, String> tblProps = new HashMap<>();
tblProps.put("write.parquet.compression-codec", "uncompressed");
tblProps.put("write.distribution-mode", "range");
tblProps.put("format-version", "2");
table = catalog.buildTable(name,
schema).withPartitionSpec(spec).withProperties(tblProps).withSortOrder(srt).create();
}
GenericAppenderFactory appenderFactory = new
GenericAppenderFactory(table.schema());
int partitionId = 1, taskId = 1;
OutputFileFactory outputFileFactory = OutputFileFactory.builderFor(table,
partitionId, taskId).format(FileFormat.PARQUET).build();
appenderFactory.setAll(table.properties());
final PartitionKey partitionKey = new PartitionKey(table.spec(),
table.spec().schema());
// partitionedFanoutWriter will auto partitioned record and create the
partitioned writer
PartitionedFanoutWriter<Record> partitionedFanoutWriter = new
PartitionedFanoutWriter<>(table.spec(), FileFormat.PARQUET, appenderFactory,
outputFileFactory,
table.io(), TARGET_FILE_SIZE_IN_BYTES) {
@Override
protected PartitionKey partition(Record record) {
partitionKey.partition(record);
return partitionKey;
}
};
GenericRecord genericRecord = GenericRecord.create(table.schema());
// FanoutDataWriter
value.forEach(val -> {
try {
GenericRecord record = genericRecord.copy();
val.toMap().forEach(record::setField);
partitionedFanoutWriter.write(record);
LOGGER.info(val.toString());
}
catch (IOException e) {
throw new RuntimeException(e);
}
});
AppendFiles appendFiles = table.newAppend();
// submit datafiles to the table
try {
Arrays.stream(partitionedFanoutWriter.dataFiles()).forEach(appendFiles::appendFile);
} catch (IOException e) {
throw new RuntimeException(e);
}
// submit snapshot
appendFiles.apply();
appendFiles.commit();
```
And I am reading the table like this:
```
table.refresh();
IcebergGenerics.ScanBuilder scanBuilder =
IcebergGenerics.read(table);
CloseableIterable<Record> result = scanBuilder.build();
for (Record r : result) {
LOGGER.info(r.toString());
}
```
Table is being partitioned on "temp" column like I want but when I read the
rows, this is the result:
```
Record(1022, first_name, last_name, annii...@noanswer.org, null, false)
```
I see null on the partitioned column.
I would be great if anyone could help out with this.
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