Github user twalthr commented on a diff in the pull request:
    --- Diff: 
    @@ -451,6 +452,28 @@ object ExpressionParser extends JavaTokenParsers with 
PackratParsers {
    +  lazy val tableFunctionCall: PackratParser[LogicalNode] =
    +    functionIdent ~ "(" ~ repsep(expression, ",") ~ ")" ^^ {
    +    case name ~ _ ~ args ~ _ => 
UnresolvedTableFunctionCall(name.toUpperCase, args)
    --- End diff --
    I think it would not hurt if we support `split(c) as (f1, f2)` for all 
expressions. This could also help in cases where we expand the projection like 
`pojo.flatten() as (f1, f2)`. I don't like the idea of a logical parser. It is 
already confusing enough for the user that we have Java API expression strings 
and SQL strings, we don't need another string syntax.
    @fhueske what do you think?

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