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[jira] [Created] (FLINK-11142) Undefined behavior in the conversion from DataStream/DataSet to Table


Yangze Guo created FLINK-11142:
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             Summary: Undefined behavior in the conversion from DataStream/DataSet to Table
                 Key: FLINK-11142
                 URL: https://issues.apache.org/jira/browse/FLINK-11142
             Project: Flink
          Issue Type: Bug
          Components: Table API & SQL
    Affects Versions: 1.7.0
            Reporter: Yangze Guo


When we try to convert DataStream/DataSet to Table. There are two ways of adding schema information, *ByName* or *ByPosition*.

This feature first proposed in [this pr|https://github.com/apache/flink/pull/5132].

In *ByPosition* mode, the current code does not check if the number of fields less than its in  DataStream/DataSet. This may cause undefined behavior, e.g. make a projection in *ByPosition* mode.

We can either fix it by adding some checking or regard this as a feature and just improve the doc to clarify it. In my opinion, the latter way seems better.

[~twalthr] Could you take a look at it when you free?



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