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… list_size 0 The writer used the list's full definition level for empty fixed-size lists, so each zero-sized list was read back as a list with one null element. Use max_def_level - 1, as for variable-size lists. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Rationale for this change
The writer used the list's full definition level for empty fixed-size
lists, so each zero-sized list was read back as a list with one null
element. Use max_def_level - 1, as for variable-size lists.
What changes are included in this PR?
cpp/src/parquet/arrow/path_internal.ccAre these changes tested?
Yes. A regression test in
cpp/src/parquet/arrow/arrow_reader_writer_test.ccfails without the change and passes with it; the surrounding test module/binary passes.Are there any user-facing changes?
See the rationale above.
Was AI used for this PR?
This PR is a joint contribution from Nilanjan Chatterjee (@nil68657) and Claude (Claude Opus 5.5, via Claude Code). Nilanjan chose the issue and directed the work; Claude reproduced the bug, wrote the fix, the test and this description.
PR code and description written by:
Reviewed before submission by:
fixed_size_list<T>[0]parquet round-trips fail: writes fine, read-back raisesArrowInvalid#49683