[ARROW-9037] [C++][C] unable to import array with null count == -1 (which could be exported)

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.17.1
• Fix Version/s: 1.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/25153
• Assignee: Zhuo Peng
• Reporter: Zhuo Peng
• Created: 05/Jun/20 00:04
• Updated: 11/Jan/23 08:04
• Resolved: 07/Jun/20 11:53

Description

If an Array is created with null_count == -1 but without any null (and thus no null bitmap buffer), then ArrayData.null_count will remain -1 when exporting if null_count is never computed. The exported C struct also has null_count == -1 [1]. But when importing, if null_count != 0, an error [2] will be raised.

[1] https://github.com/apache/arrow/blob/5389008df0267ba8d57edb7d6bb6ec0bfa10ff9a/cpp/src/arrow/c/bridge.cc#L560

[2] https://github.com/apache/arrow/blob/5389008df0267ba8d57edb7d6bb6ec0bfa10ff9a/cpp/src/arrow/c/bridge.cc#L1404

 

Issue Links

• links to: GitHub Pull Request #7353