juntaozhang commented on code in PR #4353:
URL: https://github.com/apache/calcite/pull/4353#discussion_r2069723540
##########
core/src/main/java/org/apache/calcite/sql/fun/SqlCoalesceFunction.java:
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@@ -80,4 +88,30 @@ public SqlCoalesceFunction() {
assert call.getFunctionQuantifier() == null;
return SqlCase.createSwitched(pos, null, whenList, thenList, elseExpr);
}
+
+ @Override public RelDataType inferReturnType(
Review Comment:
I'm a bit confused because neither the parent class nor the other subclasses
have added it. If we force it, there will be some warnings:
```
Method annotated with @Nullable must not override @DefaultQualifier method
```
Do we need it here?
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