What's the problem with Table API here? I had a suspicion that this
`ValidationException`:
```
def getRelNode: RelNode = if (containsUnboundedUDTFCall(logicalPlan)) {
throw new ValidationException("Cannot translate a query with an unbounded
table function call.")
} else {
logicalPlan.toRelNode(relBuilder)
}
```
is being thrown mostly as a precaution, since previously there was no
execution code to support it. Now (with this PR) that will not be the case
anymore. What would happen if we simply removed it?
[ Full content available at: https://github.com/apache/flink/pull/6574 ]
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