JiajunBernoulli commented on code in PR #3650:
URL: https://github.com/apache/calcite/pull/3650#discussion_r1467626454
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core/src/main/java/org/apache/calcite/sql/type/ReturnTypes.java:
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@@ -615,10 +615,11 @@ public static SqlCall stripSeparator(SqlCall call) {
ARG0.andThen(SqlTypeTransforms.TO_MULTISET);
/**
- * Returns the element type of a MULTISET.
+ * Returns the element type of a MULTISET, with nullability enforced.
*/
public static final SqlReturnTypeInference MULTISET_ELEMENT_NULLABLE =
Review Comment:
Is the name appropriate?
There are two field:
- NULLABLE -> TO_NULLABLE
```
public static final SqlReturnTypeInference TO_COLLECTION_ELEMENT_NULLABLE =
TO_COLLECTION_ELEMENT.andThen(SqlTypeTransforms.TO_NULLABLE);
```
- FORCE_NULLABLE -> FORCE_NULLABLE
```
public static final SqlReturnTypeInference
TO_COLLECTION_ELEMENT_FORCE_NULLABLE =
TO_COLLECTION_ELEMENT.andThen(SqlTypeTransforms.FORCE_NULLABLE);
```
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