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Minor: Assert streaming_merge has non empty sort exprs #7795

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merged 6 commits into from
Oct 16, 2023

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alamb
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@alamb alamb commented Oct 11, 2023

Which issue does this PR close?

Related to #7794

Rationale for this change

While debugging #7794 (which I think is a bad plan) the lack of Sort exprs caused very strange behavior that made it harder to debug.

Specifically, the merge code ended up passing bad indices to interleave which resulted in a panic far away from the source of the problem.

What changes are included in this PR?

  1. Return an internal error if no sort exprs are passed to streaming_merge
  2. Assert in RowCursor that there is at least one row
  3. Add some docs

Are these changes tested?

Yes by existing tests

Are there any user-facing changes?

No, only easier to debug failures

@alamb alamb marked this pull request as ready for review October 11, 2023 16:03
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alamb commented Oct 11, 2023

I verified this assert fires for my test case

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alamb commented Oct 13, 2023

@tustvold and @wiedld might you have a few minutes to review this PR?

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@jackwener jackwener left a comment

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Thanks @alamb

datafusion/physical-plan/src/sorts/cursor.rs Outdated Show resolved Hide resolved
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@alamb alamb merged commit 7aa6b36 into apache:main Oct 16, 2023
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@alamb alamb deleted the alamb/assert_non_empty_sort branch October 16, 2023 15:18
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3 participants