[jira] [Created] (FLINK-8379) Improve type checking for DataView

[Shang Yuanchun (Jira)]

Timo Walther created FLINK-8379:
-----------------------------------

             Summary: Improve type checking for DataView
                 Key: FLINK-8379
                 URL: https://issues.apache.org/jira/browse/FLINK-8379
             Project: Flink
          Issue Type: Improvement
          Components: Table API & SQL
            Reporter: Timo Walther


At the moment an accumulator with no proper type information is a valid accumulator.
{code}
        public static class CountDistinctAccum {
                public MapView<Tuple, Integer> map;
                public long count;
        }
{code}

I quickly looked into the code and it seems that MapView with type information for key and value can be null. We should add a null check at the correct position to inform the user about the non-existing type information. We should also add the type check added with FLINK-8139 for the key type of MapView.





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