nevzheng opened a new issue, #11962:
URL: https://github.com/apache/gravitino/issues/11962
### Describe the feature
Map Iceberg V3's `timestamp_ns` / `timestamptz_ns` onto Gravitino's existing
`timestamp(9)` / `timestamp_tz(9)`, so nanosecond columns load through the
native API (instead of `ExternalType("TIMESTAMP_NANO")`) and are creatable at
`format-version = 3`.
### Motivation
Today they load as an opaque `ExternalType("TIMESTAMP_NANO")` and the write
path throws. `timestamp(9)` already models nanosecond precision, so the mapping
is bijective — converter-only, with no change to the core type model, JSON
serde, Python client, or OpenAPI.
### Additional context
Part of the V3 net-new type series: `variant` (#11949), `unknown` (#11951),
`geometry`/`geography` (#11955). Implemented by #11938.
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