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Posted to github@arrow.apache.org by "CurtHagenlocher (via GitHub)" <gi...@apache.org> on 2026/10/18 21:08:58 UTC
[PR] Fix GetSlicedValues for list types whose values are an ExtensionArray [arrow-dotnet]
CurtHagenlocher opened a new pull request, #471:
URL: https://github.com/apache/arrow-dotnet/pull/471
## What's Changed
`GetSlicedValues` only sliced when `Values` derived from `Array`. `ExtensionArray` implements `IArrowArray` but doesn't derive from `Array`, so a list of extension values (e.g. `list<arrow.uuid>` backed by a `GuidArray`) returned `null` for non-null elements, indistinguishable from a null list entry.
This slices any `IArrowArray` via `ArrowArrayFactory.Slice`, which is what `Array.Slice` already delegates to, so behavior for regular arrays is unchanged and extension values now come back as the appropriate extension array. Applied to `ListArray`, `ListViewArray`, `LargeListArray`, `LargeListViewArray` and `FixedSizeListArray` (`ListViewArray` had the same check, though the issue didn't list it).
Added `ListArrayExtensionValuesTests` covering all five list types with `GuidArray` values; these fail without the fix.
Closes #468.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 5.5 <no...@anthropic.com>
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Re: [PR] Fix GetSlicedValues for list types whose values are an ExtensionArray [arrow-dotnet]
Posted by "CurtHagenlocher (via GitHub)" <gi...@apache.org>.
CurtHagenlocher merged PR #471:
URL: https://github.com/apache/arrow-dotnet/pull/471
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