Timo Walther created FLINK-8379:
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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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