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Posted to issues@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2022/08/08 12:49:00 UTC

[jira] [Created] (ARROW-17339) [C++] Simplify IPC writer for dense unions

Antoine Pitrou created ARROW-17339:
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             Summary: [C++] Simplify IPC writer for dense unions
                 Key: ARROW-17339
                 URL: https://issues.apache.org/jira/browse/ARROW-17339
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Antoine Pitrou


In ARROW-10580 we fixed the Arrow C++ implementation so that dense union offsets are always (non-strictly) monotonic for a given child, as mandated by the spec.

The IPC writer implementation, however, still assumes that dense union offsets may be in any order:
https://github.com/apache/arrow/blob/5719576c611929dd790f7f8a1ae3169a8f96f7f1/cpp/src/arrow/ipc/writer.cc#L476-L485

This can probably be simplified, making it slightly less costly to emit a sliced union array.



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