suibianwanwank opened a new pull request, #4181:
URL: https://github.com/apache/calcite/pull/4181
This PR handles decorrelate since the query contains limit 1. There are two
main types of conversions:
1. If sorted with no OFFSET and FETCH = 1, and only one collation field,
rewrite the Sort as Aggregate using MIN/MAX function.
```
Example:
Sort(sort0=[$0], dir0=[ASC], fetch=[1])
input
Rewrite to:
Aggregate(group=(corVar), agg=[min($0))
```
2. For the more general case,rewrite the sort to be
```
Aggregate(group=(corVar.. , field..))
project(first_value(field) over (partition by corVar order by (sort
collation)))
input
```
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