[PR] fix: Don't throw when releasing an exported NullArray [arrow-dotnet]

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

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.
   
   🤖 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: Don't throw when releasing an exported NullArray [arrow-dotnet]

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

CurtHagenlocher merged PR #469:
URL: https://github.com/apache/arrow-dotnet/pull/469


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