character type value is not padded with spaces

Character type value including multibyte characters is not padded
with spaces. It reproduces at 7.3.x, 7.4.x and 8.0.x.

   create table t (a char(10));
   insert into t values ('XXXXX'); -- X is 2byte character.

I expect that 'XXXXX     ' is inserted. But 'XXXXX' is inserted.

   select a, octed_length(a) from t;

      a   | octet_length
   -------+--------------
    XXXXX |           10

If padded with spaces, octet_length(a) is 15. This problem is caused
that string length is calculated by byte length(VARSIZE) in
exprTypmod().

I attache the patch for this problem.

Regards,

--
Yoshiyuki Asaba
y-asaba@sra.co.jp
*** parse_expr.c.orig    2005-01-13 02:32:36.000000000 +0900
--- parse_expr.c    2005-05-22 17:12:37.000000000 +0900
***************
*** 18,23 ****
--- 18,24 ----
  #include "catalog/pg_operator.h"
  #include "catalog/pg_proc.h"
  #include "commands/dbcommands.h"
+ #include "mb/pg_wchar.h"
  #include "miscadmin.h"
  #include "nodes/makefuncs.h"
  #include "nodes/params.h"
***************
*** 34,40 ****
  #include "utils/lsyscache.h"
  #include "utils/syscache.h"

-
  bool        Transform_null_equals = false;

  static Node *transformColumnRef(ParseState *pstate, ColumnRef *cref);
--- 35,40 ----
***************
*** 1491,1497 ****
                  {
                      case BPCHAROID:
                          if (!con->constisnull)
!                             return VARSIZE(DatumGetPointer(con->constvalue));
                          break;
                      default:
                          break;
--- 1491,1503 ----
                  {
                      case BPCHAROID:
                          if (!con->constisnull)
!                         {
!                             int32 len = VARSIZE(DatumGetPointer(con->constvalue)) - VARHDRSZ;
!
!                             if (pg_database_encoding_max_length() > 1)
!                                 len = pg_mbstrlen_with_len(VARDATA(DatumGetPointer(con->constvalue)), len);
!                             return len + VARHDRSZ;
!                         }
                          break;
                      default:
                          break;