GH-45532: [C++] RunEndEncodedBuilder should clear dimensions after a Finish() call
#45533
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Rationale for this change
This resolves the issue reported in #45532. Specifically, this updates the
RunEndEncodedBuilderdimensions after aFinish()call and therefore makes the function idempotent.What changes are included in this PR?
This updates the
RunEndEncodedBuilder's dimensions after aFinish()call and adds a test which ensures the function properly resets the builder state and is idempotent.Are these changes tested?
Yes
Are there any user-facing changes?
Yes; this is a bug fix to a user-facing API.
RunEndEncodedBuilder->Finish()doesn't properly reset builder state when called #45532