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Fix bug in new shuffle-based groupby implementation #11836
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raydouglass
merged 5 commits into
rapidsai:branch-22.10
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rjzamora:fix-shuffle-groupby
Sep 30, 2022
Merged
Fix bug in new shuffle-based groupby implementation #11836
raydouglass
merged 5 commits into
rapidsai:branch-22.10
from
rjzamora:fix-shuffle-groupby
Sep 30, 2022
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Affects Java cuDF API.
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Codecov ReportBase: 87.46% // Head: 87.49% // Increases project coverage by
Additional details and impacted files@@ Coverage Diff @@
## branch-22.10 #11836 +/- ##
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+ Coverage 87.46% 87.49% +0.03%
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Files 133 133
Lines 21792 21792
================================================
+ Hits 19060 19067 +7
+ Misses 2732 2725 -7
Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here. ☔ View full report at Codecov. |
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Description
This PR fixes a subtle bug introduced in #11800. While working on the corresponding dask-cuda benchmark for that PR rapidsai/dask-cuda#979, we discovered that non-deterministic column ordering in
_groupby_partition_agg
and_tree_node_agg
can trigger metadata-enforcement errors in follow-up operations. This PR simply sorts the output column ordering in those functions (so that the column ordering is always deterministic).Note that this bug is difficult to reproduce in a pytest, because it rarely occurs with a smaller number of devices (I need to use a full dgx machine to consistently trigger the error).
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