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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