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      Currently, FlinkTypeFactory does not always preserve nullability attributes when handling nested types.

      E.g. a table function that returns ROW<s STRING, sa ARRAY<STRING> NOT NULL> looses information to ROW<s STRING, sa ARRAY<STRING>>.

      Same for built-in functions such as COLLECT which results in mismatches as mentioned in FLINK-14042.

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              • Assignee:
                twalthr Timo Walther
                Reporter:
                twalthr Timo Walther
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