dtenedor opened a new pull request, #41965:
URL: https://github.com/apache/spark/pull/41965
### What changes were proposed in this pull request?
This PR updates the parsing of table function arguments to require
parentheses around identifier after the TABLE keyword.
* I kept the previous syntax without the parentheses as an optional case in
the SQL grammar so that we can catch it in the `AstBuilder` and throw an
informative error message telling the user to add parentheses and try the query
again.
* I had to swap the order of parsing table function arguments, so the
`table(identifier)` syntax does not accidentally parse as a scalar function
call:
```
functionTableArgument
: functionTableReferenceArgument
| functionArgument
;
```
### Why are the changes needed?
This syntax is written down in the SQL standard. Per the standard, `TABLE
identifier` should actually be passed as `TABLE(identifier)`.
### Does this PR introduce _any_ user-facing change?
Yes, SQL syntax changes slightly.
### How was this patch tested?
This PR adds and updates unit test coverage.
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