Github user StephanEwen commented on the pull request:
https://github.com/apache/incubator-flink/pull/203#issuecomment-67171707
I think it is right that the `fillInTypeInformation()` call fails in the
example you mentioned above. If the semantic properties are extracted on a
different type info than the one that is filled in, we assume wrong semantic
properties in the optimizer.
We need to fix this by deferring the property extraction.
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