Problems appending file to Athena

[Taher Koitawala]

Hi All,
          I am trying to append data files to an existing iceberg table in
Athena. I wrote a Java app that uses the Iceberg apis to do this. Attached
below is a sample source code. I do see parquet files being placed on s3
however I cannot read those files in Athena. Am I missing something?

```
//Use glueCatalog and loaded table
Table table =
catalog.loadTable(TableIdentifier.of(Namespace.of("tpc_ds"),"store_sales"));

//created a file appender
FileAppender<Record> appender
=factory.newAppender(S3OutputFile.fromLocation(path,s3Client),
FileFormat.PARQUET);

//Added records to appender
appender.add(record);

//get len and close appender
long fileLen = appender.length();
appender.close();

//get metrics
appender.metrics();

//register datafiles with table
Transaction transaction = table.newTransaction();

//Append data file
AppendFiles appendFiles = transaction.newAppend();
            appendFiles.appendFile(DataFiles.builder(spec)
.withMetrics(metrics)
.withPath(location)
.withFormat(FileFormat.PARQUET)
.withRecordCount(metrics.recordCount())
.withFileSizeInBytes(fileLen).
build());

    //commit append
    appendFiles.commit();

    //commit transaction
    transaction.commitTransaction();

    --program end

```

Regards,
Taher Koitawala