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Zhanghao Chen commented on FLINK-35555: --------------------------------------- [~Weijie Guo] WDTY about the suggested fix? > Serializing List with null values throws NPE > -------------------------------------------- > > Key: FLINK-35555 > URL: https://issues.apache.org/jira/browse/FLINK-35555 > Project: Flink > Issue Type: Sub-task > Components: API / Type Serialization System > Affects Versions: 1.20.0 > Reporter: Zhanghao Chen > Priority: Major > Fix For: 1.20.0 > > > FLINK-34123 introduced built-in serialization support for java.util.List, > which relies on the existing {{ListSerializer}} impl. However, > {{ListSerializer}} does not allow null values, as it is originally designed > for serializing {{ListState}} only where null value is explicitly forbidden > in the contract. > Directly adding null marker to allow null values will break backwards state > compatibility, so we'll need to introduce a new List serializer called > {{NullableElementListSerializer}} and the corrsponding TypeInformation called > {{NullableElementListTypeInfo}} that allows null values for serializing user > objects, and leaves the existing {{ListSerializer}} and {{ListTypeInfo}} for > Flink's internal state use. -- This message was sent by Atlassian Jira (v8.20.10#820010)