On Thursday, December 14, 2017, Ashutosh Bapat <
ashutosh.bapat@enterprisedb.com> wrote:
Hi,
We allow a function to be invoked as part of PERFORM statement in plpgsql
do $$
begin perform pg_relation_size('t1'); end; $$ language plpgsql;
DO
But we do not allow a procedure to be invoked this way
create procedure dummy_proc(a int) as $$
begin null; end;
$$ language plpgsql;
CREATE PROCEDURE
do $$
begin perform dummy_proc(1); end; $$ language plpgsql;
ERROR: dummy_proc(integer) is a procedure
LINE 1: SELECT dummy_proc(1)
^
HINT: To call a procedure, use CALL.
QUERY: SELECT dummy_proc(1)
CONTEXT: PL/pgSQL function inline_code_block line 2 at PERFORM
The documentation of PERFORM [1] says
"For any SQL command that does not return rows, for example INSERT
without a RETURNING clause, you can execute the command within a
PL/pgSQL function just by writing the command."
Procedures fit that category and like functions, I think, we should
allow them be invoked directly without any quoting and CALL
decoration.
I disagree. The SQL command is 'CALL'. The documentation is really only clarifying when PERFORM is explicitly required.
merlin