snuyanzin commented on code in PR #21993:
URL: https://github.com/apache/flink/pull/21993#discussion_r1116870255
##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/inference/strategies/SpecificInputTypeStrategies.java:
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@@ -71,7 +71,11 @@ public final class SpecificInputTypeStrategies {
/** Argument type derived from the array element type. */
public static final ArgumentTypeStrategy ARRAY_ELEMENT_ARG =
- new ArrayElementArgumentTypeStrategy();
+ new ArrayElementArgumentTypeStrategy(false);
+
+ /** Argument type derived from the array element type. But leaves
nullability untouched. */
Review Comment:
Compare implementation. The logic in implementation is different: in
`org.apache.flink.table.types.inference.strategies.CommonArgumentTypeStrategy#inferArgumentType`
it could preserve nullability. In your case no, that's why i raised it
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