slinkydeveloper commented on a change in pull request #17256:
URL: https://github.com/apache/flink/pull/17256#discussion_r708891859
##########
File path:
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/inference/TypeStrategies.java
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@@ -105,6 +105,23 @@ public static TypeStrategy nullableIfArgs(TypeStrategy
initialStrategy) {
return nullableIfArgs(ConstantArgumentCount.any(), initialStrategy);
}
+ /**
+ * A type strategy that can be used to make a result type nullable if all
the selected input
+ * arguments is nullable. Otherwise the type will be not null.
+ */
+ public static TypeStrategy nullableIfAllArgs(
Review comment:
Deriving nullability from the first arg will bring back problems like:
```
COALESCE(REGEXP_EXTRACT('22','[A-Z]+'),'-')
```
Returning a nullable data type, because `REGEXP_EXTRACT` is always nullable.
Is that what you mean?
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