Re: [PR] fix(manifest): support nanosecond timestamp partitions [iceberg-go]

["shoemoney (via GitHub)" <gi...@apache.org>]

shoemoney commented on PR #2034:
URL: https://github.com/apache/iceberg-go/pull/2034#issuecomment-5765184110

   @laskoviymishka Thanks — you were right, the write path was never reached. All four items are addressed in 731e48b:
   
   - `newPartitionFieldStat` now has a `TimestampNsType, TimestampTzNsType` arm routing through a new `convertPartitionTimestampNano`, exactly as you sketched.
   - `TestNewManifestWriterV3NanosecondPartition` now `Add`s data-file entries (including a negative pre-epoch value) and calls `ToManifestFile`, so the partition-summary bounds are actually serialized and asserted as little-endian int64 nanoseconds. It fails against the previous commit.
   - The two ns arms are mirrored into the `partitionTypeToAvroSchemaNonNullable` test helper, and `TestNanosecondPartitionAvroSchema` now round-trips through the non-nullable schema too.
   - Dropped the unused `TimestampNsSchema`/`TimestampTzNsSchema` compiled vars.
   
   I left `convertLogicalTypeValue` alone since, as you noted, the wire output is already correct there and it's orthogonal to this fix. Ready for another pass.


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