thomasrebele commented on a change in pull request #2302:
URL: https://github.com/apache/calcite/pull/2302#discussion_r580220147
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File path: core/src/main/java/org/apache/calcite/sql2rel/RelDecorrelator.java
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@@ -429,7 +430,7 @@ protected RexNode removeCorrelationExpr(
ImmutableSortedMap.of());
}
- public @Nullable Frame decorrelateRel(Sort rel) {
+ public @Nullable Frame decorrelateRel(Sort rel, boolean isCorVarDefined) {
//
Review comment:
Indeed, @rubenada's example needs to be taken care of if we would remove
the isCorVarDefined. By passing it as an parameter we avoid such subtle
problems. We could translate it to an attribute and wrap the code that changes
the attribute in a try-finally block:
```
boolean prevCorVarDefined = isCorVarDefined
try {
// ...
}
finally {
isCorVarDefined = prevCorVarDefined;
}
```
I'm slightly leaning towards using a parameter, which looks a bit cleaner to
me. Does anyone have another suggestions how to handle this variable?
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