[HACKERS] typmod is always -1

[Pavel Stehule]

Hello

I am playing with custom typmod. I did simple wrapper over varchar type.

PG_FUNCTION_INFO_V1(mvarcharin);

Datum
mvarcharin(PG_FUNCTION_ARGS)
{
elog(NOTICE, ">>>>>>>>%d", PG_GETARG_INT32(2));
        return DirectFunctionCall3(varchar,
                                            DirectFunctionCall3(varcharin,

     PG_GETARG_DATUM(0),

     PG_GETARG_DATUM(1),

     Int32GetDatum(-1)),
                                            PG_GETARG_DATUM(2),
 /* original typmod */
                                            BoolGetDatum(true));
 /* explit casting, quite truncate */
}


CREATE TYPE mvarchar (
        INPUT = mvarcharin,
        OUTPUT = mvarcharout,
        LIKE = pg_catalog.varchar,
        typmod_in = pg_catalog.varchartypmodin,
        typmod_out = pg_catalog.varchartypmodout
);

I have a problem - every call of mvarcharin is with typmod = -1.

postgres=# create table x(a mvarchar(3));
CREATE TABLE
Time: 29,930 ms
postgres=# \d x
          Table "public.x"
┌────────┬─────────────┬───────────┐
│ Column │ Type        │ Modifiers │
├────────┴─────────────┴───────────┤
│ a      │ mvarchar(3) │           │
└──────────────────────────────────┘


postgres=# INSERT INTO x values('abcdef');
NOTICE:  >>>>>>>>-1
INSERT 0 1
Time: 2,244 ms
postgres=#

can somebody navigate me?

regards
Pavel Stehule

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