Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/3660
Unfortunately, I found two issues that need to be fixed before we can merge
this. According to SQL the seed and bound can also be defined by an other
column. Right now `rand(f7)` leads to a compiler exception. We should check if
the arguments are constant and only then move it to the reusable area.
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