CurtHagenlocher opened a new pull request, #469:
URL: https://github.com/apache/arrow-dotnet/pull/469
## What's Changed
Exporting a `NullArray` with `CArrowArrayExporter.ExportArray` and then
releasing it throws `ArgumentOutOfRangeException: bytesAllocated ('0') must be
a non-negative and non-zero value`. This happens for any length.
A `NullArray` has no buffers and no children, so the export allocates
nothing through `ExportedAllocationOwner`. On release, `Dispose()` called
`GC.RemoveMemoryPressure(_allocationSize)` with a size of 0, and the runtime
rejects that. Every other array type allocates at least its buffer-pointer
array, which is why this hasn't come up before. `Dispose()` now only removes
memory pressure when something was allocated.
The release runs inside the C Data release callback. When a native consumer
calls that callback, the exception would cross the native boundary.
### Tests
`RoundTripNullArray` exports, imports and releases null arrays of length 0
and 3. It fails without the fix on net8.0, net462 and net472.
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Co-Authored-By: Claude Opus 5.5 <[email protected]>
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