findepi opened a new pull request, #14356:
URL: https://github.com/apache/datafusion/pull/14356
This commit fixes two bugs related to UNION handling
- when constructing union plan nullability of the other union branch was
ignored, thus resulting field could easily have incorrect nullability
- when pruning/simplifying projects, in `recompute_schema` function
there was similar logic, thus loosing nullability information even for
correctly constructed Union plan node
As a result, other optimizer logic (e.g. `expr_simplifier.rs`) could
draw incorrect conclusions and thus lead to incorrect query results, as
demonstrated with the attached SLT test.
- fixes https://github.com/apache/datafusion/issues/14352
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