vlsi commented on a change in pull request #2353:
URL: https://github.com/apache/calcite/pull/2353#discussion_r583607305
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File path: core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java
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@@ -2792,27 +2792,28 @@ public static Collection multisetUnionAll(Collection
collection1,
* Function that, given a certain List containing single-item structs (i.e.
arrays / lists with
* a single item), builds an Enumerable that returns those single items
inside the structs.
*/
- public static Function1<Object, Enumerable<Comparable>> flatList() {
+ public static Function1<Object, Enumerable<Object>> flatList() {
Review comment:
Are `null` values acceptable for the resulting function?
In other words, is `inputObject == null` valid or not?
If it is valid, then the signature should better be
What do you think of the following signature?
```suggestion
public static <T> Function1<T, Enumerable<T>> flatList() {
```
If null is not valid, then cast from `inputObject` to `List` should indeed
be like `(List<Object>) ...` which effectively means `the list of non-nullable
Object`
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