Re: PL/PgSQL "bare" function calls

Neil Conway <neilc@samurai.com> writes:
> (3) The parser must distinguish between two cases when it sees an
> unknown word (T_WORD) beginning a statement. The word could be the
> beginning of a SQL statement (stmt_execsql in the grammar), such as:

> UPDATE ...;

> or the name of a function in a function call:

> invoke_func(...);

> The patch currently distinguishes between these cases by looking at the
> next token -- if it is a left parenthesis, the patch assumes it is a
> function call, otherwise it assumes it is a SQL statement. Is this the
> best approach?

That seems fairly unworkable.  For example
SELECT (2,3,4);

is valid SQL.  Also I'm not sure if you can extend this to cope with
schema-qualified function names.
        regards, tom lane