GH-41771: [C++] Iterator releases its resource immediately when it reads all values #41824
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Rationale for this change
Iterator
keeps its resource (ptr_
) until it's deleted but we can release its resource immediately when it reads all values. IfIterator
keeps its resource until it's deleted, it may block closing a file. See GH-41771 for this case.What changes are included in this PR?
Releases
ptr_
whenNext()
returns the end.Are these changes tested?
Yes.
Are there any user-facing changes?
Yes.