alamb commented on issue #12446:
URL: https://github.com/apache/datafusion/issues/12446#issuecomment-2361896831
Even simpler:
```sql
select * from (select c, a, NULL::int as a0 from t order by a, c) t1
union all
select * from (select c, NULL::int as a, a0 from t order by a0, c) t2
order by a, a0, c
limit 2;
```
> DataFusion error: SanityCheckPlan
caused by
Error during planning: Plan: ["SortPreservingMergeExec: [a@1 ASC NULLS
LAST,a0@2 ASC NULLS LAST,c@0 ASC NULLS LAST], fetch=2", " UnionExec", "
SortExec: TopK(fetch=2), expr=[a@1 ASC NULLS LAST,c@0 ASC NULLS LAST],
preserve_partitioning=[false]", " ProjectionExec: expr=[c@1 as c, a@0 as
a, NULL as a0]", " MemoryExec: partitions=1, partition_sizes=[1]", "
SortExec: TopK(fetch=2), expr=[a0@2 ASC NULLS LAST,c@0 ASC NULLS LAST],
preserve_partitioning=[false]", " ProjectionExec: expr=[c@1 as c, NULL as
a, a0@0 as a0]", " MemoryExec: partitions=1, partition_sizes=[1]"] does
not satisfy order requirements: [PhysicalSortRequirement { expr: Column { name:
"a", index: 1 }, options: Some(SortOptions { descending: false, nulls_first:
false }) }, PhysicalSortRequirement { expr: Column { name: "a0", index: 2 },
options: Some(SortOptions { descending: false, nulls_first: false }) },
PhysicalSortRequirement { expr: Column { name: "c", index: 0 }, options:
Some(SortOp
tions { descending: false, nulls_first: false }) }]. Child-0 order:
OrderingEquivalenceClass { orderings: [[PhysicalSortExpr { expr: Column { name:
"a", index: 1 }, options: SortOptions { descending: false, nulls_first: false }
}], [PhysicalSortExpr { expr: Column { name: "a0", index: 2 }, options:
SortOptions { descending: false, nulls_first: false } }]] }
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