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Posted to issues@iceberg.apache.org by "laskoviymishka (via GitHub)" <gi...@apache.org> on 2026/05/05 19:17:30 UTC
[I] feat(arrow): map UnknownType to plain Arrow null and back [iceberg-go]
laskoviymishka opened a new issue, #1003:
URL: https://github.com/apache/iceberg-go/issues/1003
Parent: #589
iceberg-go's iceberg-to-arrow converter wraps `UnknownType` in an Opaque extension type around `arrow.Null`. pyiceberg maps it to plain `pa.null()` instead. Mirror pyiceberg's posture so the cross-client wire format on Arrow records matches.
Two pieces:
1. Forward (iceberg → arrow): drop the `OpaqueType` wrapper in the `convertToArrow.VisitUnknown` visitor; emit plain `arrow.Null`.
2. Reverse (arrow → iceberg): no case for `*arrow.NullType` in the `convertToIceberg` switch over Arrow types. Add it; map to `iceberg.PrimitiveTypes.Unknown`.
Tests cover round-trip in both directions. Watch for any callers that depend on the Opaque wrapper's extension metadata; if they exist, this is a small breaking change worth calling out in the PR.
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Re: [I] feat(arrow): map UnknownType to plain Arrow null and back [iceberg-go]
Posted by "zeroshade (via GitHub)" <gi...@apache.org>.
zeroshade closed issue #1003: feat(arrow): map UnknownType to plain Arrow null and back
URL: https://github.com/apache/iceberg-go/issues/1003
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