lirui-apache commented on issue #11494: [FLINK-16732][hive] Failed to call Hive UDF with constant return value URL: https://github.com/apache/flink/pull/11494#issuecomment-603095628 > Have Other functions this risk? I'm not sure about that, to be honest. In this specific case, the constant OI is created by `GenericUDF::initializeAndFoldConstants` and we use it to inspect the result returned by `GenericUDFStringToMap` and hit the problem. I think it's not safe to use OI in that way and add the check in this PR. But not all functions have this problem. Perhaps the only way to find out is through more tests.
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