Re: Where is the char and varchar length in pg_catalog for function input variables

How does postgres figure this out to throw the error msg?

create table test_table
(
    column1 char(10),
    column2 varchar(20)
) without oids;


create or replace function test1(c1 char(10), c2 varchar(20))
returns void as
$$
BEGIN
insert into test_table values ($1, $2);
END
$$
language plpgsql

select test1('1234567890','ABCDEFGHIJKLMNOPQRST')

select * from test_table;
-- 1234567890, ABCDEFGHIJKLMNOPQRST

select test1('this is way way longer than 10 characters','this is way way
way way way way way way way way way way longer than 20 characters')

ERROR:  value too long for type character(10)
CONTEXT:  SQL statement "insert into test_table values ($1, $2)"
PL/pgSQL function "test1" line 3 at SQL statement

********** Error **********

ERROR: value too long for type character(10)



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