wiedld commented on code in PR #12414:
URL: https://github.com/apache/datafusion/pull/12414#discussion_r1752913325
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datafusion/sqllogictest/test_files/order.slt:
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@@ -1220,10 +1220,10 @@ physical_plan
01)ProjectionExec: expr=[b@0 as b, c@1 as c, a@2 as a, a0@3 as a0]
02)--SortPreservingMergeExec: [d@4 ASC NULLS LAST,c@1 ASC NULLS LAST,a@2 ASC
NULLS LAST,a0@3 ASC NULLS LAST,b@0 ASC NULLS LAST], fetch=2
03)----UnionExec
-04)------SortExec: TopK(fetch=2), expr=[d@4 ASC NULLS LAST,c@1 ASC NULLS
LAST,a@2 ASC NULLS LAST,b@0 ASC NULLS LAST], preserve_partitioning=[false]
+04)------SortExec: TopK(fetch=2), expr=[d@4 ASC NULLS LAST,c@1 ASC NULLS
LAST,b@0 ASC NULLS LAST], preserve_partitioning=[false]
05)--------ProjectionExec: expr=[b@1 as b, c@2 as c, a@0 as a, NULL as a0, d@3
as d]
06)----------CsvExec: file_groups={1 group:
[[WORKSPACE_ROOT/datafusion/core/tests/data/window_2.csv]]}, projection=[a, b,
c, d], output_ordering=[c@2 ASC NULLS LAST], has_header=true
-07)------SortExec: TopK(fetch=2), expr=[d@4 ASC NULLS LAST,c@1 ASC NULLS
LAST,a0@3 ASC NULLS LAST,b@0 ASC NULLS LAST], preserve_partitioning=[false]
Review Comment:
> you can actually add constants, as there is a flag, "across_partitions,"
that indicates whether the value is constant across all partitions or only in
its corresponding partition
Made the change per suggestion, and I'm not sure this is the proper fix. If
I add the constants on the union's equivalence properties, then there are other
ramifications because:
* the
[EquivalenceProperties::output_ordering](https://github.com/apache/datafusion/blob/3ece7a736193a87941a00eb35f3001df282fd075/datafusion/physical-expr/src/equivalence/properties.rs#L142)
remove the constants
* the
[EquivalenceProperties::normalized_oeq_class](https://github.com/apache/datafusion/blob/3ece7a736193a87941a00eb35f3001df282fd075/datafusion/physical-expr/src/equivalence/properties.rs#L154)
remove the constants
The specific example above (where the `a@2 ASC NULLS LAST` and `a0@3 ASC
NULLS LAST` are removed on non-constant projections) specifically occurs within
the EnforceSorting optimization. I started hacking around this, but it feels
like the suggested change is actually [changing the
definition](https://github.com/apache/datafusion/pull/12414/commits/0f317a64a748c5f08cb2041a73031c54720f3dae)
of what the constants are?
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