goldmedal opened a new pull request, #12873:
URL: https://github.com/apache/datafusion/pull/12873
## Which issue does this PR close?
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no corresponding issue.
## Rationale for this change
After the plan optimization, the limit could be pushed down to Sort.
Unparser can't handle the pushdown limit currently.
Consider the following plan:
```
Sort: t1.age ASC NULLS FIRST, fetch=10
Projection: t1.id, t1.age
TableScan: t1
```
It should be unparsed to
```sql
SELECT t1.id, t1.age FROM t1 ORDER BY t1.age ASC NULLS FIRST LIMIT 10
```
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## What changes are included in this PR?
- Unparse the Sort with the pushdown limit.
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## Are these changes tested?
yes
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## Are there any user-facing changes?
no
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