NobiGo commented on code in PR #4403:
URL: https://github.com/apache/calcite/pull/4403#discussion_r2113321370
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core/src/main/java/org/apache/calcite/sql/SqlKind.java:
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@@ -662,6 +662,9 @@ public enum SqlKind {
/** {@code IS NOT NULL} operator. */
IS_NOT_NULL,
+ /** {@code CAST NOT NULL} operator. */
+ CAST_NOT_NULL,
Review Comment:
> could nullif have the opposite problem, when a is never null, because the
result of nullif is always nullable?
nullif(a,b) when a is not nullable, then the result is nullable. Now, In
Calcite, we convert `nullif(a,b)->case a when b then null else a` is nullable
too. So it is good.
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