viirya opened a new pull request, #41610:
URL: https://github.com/apache/arrow/pull/41610
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### Rationale for this change
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This is a follow up of https://github.com/apache/arrow/issues/40038. In
https://github.com/apache/arrow/issues/40038, we fixed null offset buffer issue
for BaseVariableWidthVector. For empty vector, instead of a empty offset buffer
which turns to be a null buffer through C Data Interface, we export a non-empty
offset which is supposed to contain zero value.
But the initialization code has a bug in the PR
https://github.com/apache/arrow/pull/40043, so the offset buffer is not
initialized. Note that this is not a regression because the exported vector
never works due to null offset buffer.
### What changes are included in this PR?
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Fixed the uninitialized offset buffer of empty `BaseVariableWidthVector`.
### Are these changes tested?
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Added test cases.
### Are there any user-facing changes?
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No
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