alamb commented on issue #12446:
URL: https://github.com/apache/datafusion/issues/12446#issuecomment-2361894958
I spent some time finding a smaller standalone reproducer
```sql
create table t(a0 int, a int, b int, c int) as values (1, 2, 3, 4), (5, 6,
7, 8);
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 c, a, a0, b
limit 2;
```
When run
```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 c, a, a0, b
limit 2;
SanityCheckPlan
caused by
Error during planning: Plan: ["SortPreservingMergeExec: [c@0 ASC NULLS
LAST,a@1 ASC NULLS LAST,a0@2 ASC NULLS LAST,b@3 ASC NULLS LAST], fetch=2", "
UnionExec", " SortExec: TopK(fetch=2), expr=[c@0 ASC NULLS LAST,a@1 ASC
NULLS LAST,b@3 ASC NULLS LAST], preserve_partitioning=[false]", "
ProjectionExec: expr=[c@2 as c, a@0 as a, NULL as a0, b@1 as b]", "
MemoryExec: partitions=1, partition_sizes=[1]", " SortExec: TopK(fetch=2),
expr=[c@0 ASC NULLS LAST,a0@2 ASC NULLS LAST,b@3 ASC NULLS LAST],
preserve_partitioning=[false]", " ProjectionExec: expr=[c@2 as c, NULL as
a, a0@0 as a0, b@1 as b]", " MemoryExec: partitions=1,
partition_sizes=[1]"] does not satisfy order requirements:
[PhysicalSortRequirement { expr: Column { name: "c", index: 0 }, options:
Some(SortOptions { descending: false, nulls_first: false }) },
PhysicalSortRequirement { expr: Column { name: "a", index: 1 }, options:
Some(SortOptions { descending: false, nulls_first: false }) }, Physical
SortRequirement { expr: Column { name: "a0", index: 2 }, options:
Some(SortOptions { descending: false, nulls_first: false }) },
PhysicalSortRequirement { expr: Column { name: "b", index: 3 }, options:
Some(SortOptions { descending: false, nulls_first: false }) }]. Child-0 order:
OrderingEquivalenceClass { orderings: [[PhysicalSortExpr { expr: Column { name:
"c", index: 0 }, options: SortOptions { descending: false, nulls_first: false }
}, PhysicalSortExpr { expr: Column { name: "a", index: 1 }, options:
SortOptions { descending: false, nulls_first: false } }], [PhysicalSortExpr {
expr: Column { name: "c", index: 0 }, 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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