korlov42 commented on PR #4437:
URL: https://github.com/apache/calcite/pull/4437#issuecomment-3000489754
@suibianwanwank thanks! The only thing I'm a little bit concerned about is
that `LogicalProject` now exposes `variablesSet` in certain cases. But as far
as I see this is valid approach to force `RelBuilder` not to merge projections:
```
// org.apache.calcite.tools.RelBuilder#project_:
<...>
// Do not merge projection when top projection has correlation variables
bloat:
if (frame.rel instanceof Project
&& config.bloat() >= 0
&& variables.isEmpty()) {
```
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