barrkel opened a new pull request, #3693:
URL: https://github.com/apache/calcite/pull/3693
[CALCITE-6254](https://issues.apache.org/jira/browse/CALCITE-6254) Support
table function calls in `FROM` clause without `TABLE` wrapping.
Currently, when selecting from a table function, the function call needs to
be wrapped in `TABLE()` like this:
```
SELECT * FROM TABLE(table_func('args'));
```
This PR enables this syntax:
```
SELECT * FROM table_func('args');
```
Three tokens of lookahead are necessary to avoid a conflict in the grammar
with the [dynamic columns feature used by
Phoenix](https://phoenix.apache.org/dynamic_columns.html)
```
SELECT * FROM EventLog(lastGCTime TIME)
```
Three tokens of lookahead means looking past the `(` and identifier to the
presence of a type production. The table extension clause for dynamic columns
requires at least one field, so the empty case of `()` is not ambiguous either.
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