Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/2653
HI @wuchong, thanks for this feature. This looks really interesting :-)
I haven't looked at the PR in detail yet. However, I would like to avoid
customizing the parser if possible. I haven't tested it but would it be
possible to express `OUTER APPLY` and `CROSS APPLY` with Calcite's `LATERAL`
tables?
`CROSS APPLY` corresponds to:
```
SELECT MyTable.*, t.s FROM MyTable, LATERAL TABLE(split(MyTable.a)) AS t(s)
```
`OUTER APPLY` could be:
```
SELECT MyTable.*, t.s
FROM MyTable LEFT JOIN LATERAL TABLE(split(MyTable.a)) AS t(s)
```
Adding `crossApply` and `outerApply` for the Table API is fine with me.
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