ConeyLiu commented on PR #7836:
URL: https://github.com/apache/iceberg/pull/7836#issuecomment-1603762841
> which always loses precision after storing the physical long value to
iceberg?
The write will convert the TimeStamp to long which should not lose the
precision.
```java
private static class TimestampDataWriter
extends ParquetValueWriters.PrimitiveWriter<TimestampData> {
private TimestampDataWriter(ColumnDescriptor desc) {
super(desc);
}
@Override
public void write(int repetitionLevel, TimestampData value) {
column.writeLong(
repetitionLevel, value.getMillisecond() * 1000 +
value.getNanoOfMillisecond() / 1000);
}
}
```
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