lucasfang opened a new pull request, #2617:
URL: https://github.com/apache/orc/pull/2617
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### What changes were proposed in this pull request?
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This PR adds non-owning buffer support to DataBuffer so it can attach
externally managed memory (via setData) without taking ownership of
allocation/free, updates reserve/resize/destructor paths to be ownership-aware,
and adds a focused unit test to verify that non-owning buffers keep external
size semantics and do not free external memory during destruction.
### Why are the changes needed?
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These changes are needed to safely integrate with external prebuffer cache
scenarios where memory is managed outside ORC, avoiding unnecessary
reallocations and preventing ownership/lifecycle mismatches.
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Generated-by: GPT-5.3-codex
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