zabetak commented on a change in pull request #2623:
URL: https://github.com/apache/calcite/pull/2623#discussion_r761868245
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File path: core/src/main/java/org/apache/calcite/sql2rel/SqlToRelConverter.java
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@@ -4346,7 +4336,21 @@ private void convertSelectList(
relBuilder.push(bb.root())
.projectNamed(exprs, fieldNames, true);
- bb.setRoot(relBuilder.build(), false);
+
+ RelNode project = relBuilder.build();
+
+ final RelNode r;
+ final CorrelationUse p = getCorrelationUse(bb, project);
+ if (p != null) {
+ assert p.r instanceof Project;
+ Project proj = (Project) p.r;
+ r = LogicalProject.create(proj.getInput(), proj.getHints(),
Review comment:
I've seen that this pattern appears in other places in
`SqlToRelConverter` but it is a bit weird that from one hand we are asserting
that the project is an instance of a superclass (`Project`) and on the other
hand we are creating a `LogicalProject`. Can we use the `relbuilder` to create
the new project? Would it be better to rely on `project#copy`?
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