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Make length() disregard trailing spaces in char(n) values, per discussion

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some time ago and recent patch from Gavin Sherry.  Update documentation
to point out that trailing spaces are insignificant in char(n).
This commit is contained in:
Tom Lane
2004-02-01 06:27:48 +00:00
parent 08b0e60563
commit f27976c85b
2 changed files with 27 additions and 9 deletions
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16
src/backend/utils/adt/varchar.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/varchar.c,v 1.103 2003/11/29 19:51:59 pgsql Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/varchar.c,v 1.104 2004/02/01 06:27:48 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -510,14 +510,16 @@ Datum
bpcharlen(PG_FUNCTION_ARGS)
{
BpChar *arg = PG_GETARG_BPCHAR_P(0);
int len;
/* optimization for single byte encoding */
if (pg_database_encoding_max_length() <= 1)
PG_RETURN_INT32(VARSIZE(arg) - VARHDRSZ);
/* get number of bytes, ignoring trailing spaces */
len = bcTruelen(arg);
/* in multibyte encoding, convert to number of characters */
if (pg_database_encoding_max_length() != 1)
len = pg_mbstrlen_with_len(VARDATA(arg), len);
PG_RETURN_INT32(
pg_mbstrlen_with_len(VARDATA(arg), VARSIZE(arg) - VARHDRSZ)
);
PG_RETURN_INT32(len);
}
Datum