Neelesh Srinivas Salian closed FLINK-1151.
    Resolution: Information Provided

Can solve this by sampling the size of object by serializing them to a 
DataOutputView which just counts bytes instead of writing data somewhere.

> CollectionDataSource does not provide statistics
> ------------------------------------------------
>                 Key: FLINK-1151
>                 URL: https://issues.apache.org/jira/browse/FLINK-1151
>             Project: Flink
>          Issue Type: Improvement
>          Components: Optimizer
>    Affects Versions: 0.6.1-incubating, 0.7.0-incubating
>            Reporter: Fabian Hueske
>            Priority: Minor
> CollectionDataSources do not provide statistics for the optimizer although 
> the data type and the number of elements are known.

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