Github user wuchong commented on the issue:
https://github.com/apache/flink/pull/2102
As I mentioned above, the `cannot translate call AS($t0, $t1)` error
because of a Calcite bug. The
[CALCITE-1297](https://issues.apache.org/jira/browse/CALCITE-1297) fixed it ,
but not yet released. I will wait for Calcite 1.9 released and start working
on it.
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