Hi all,

We have source data with a timestamp field in LONG type to land in an
Iceberg table. We want to partition the table with the timestamp field such
that we can query recent data more efficiently. However, LONG is not
supported as the source type of time-based transform (hour, day, etc)

I find the previous discussion https://github.com/apache/iceberg/issues/417 and
Ryan suggested two solutions

1. type promotion from LONG to TIMESTAMP
2. custom transform

As I understand it, neither solution has already been implemented yet. Is
there any progress in either direction? Which solution does the community
prefer? Any other suggestions are also appreciated.

Thanks,
Manu

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