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I have written some patches which add support for NULLs to Postgres95.
In fact support for NULLs was already present in postgres, but it had been
disabled because not completely debugged, I believe. My patches simply add
some checks here and there. To enable the new code you must add -DNULL_PATCH
to CFLAGS in Makefile.global. After recompiling you can do things like:

insert into a (x, y) values (1, NULL);
update a set x = NULL where x = 0;

You can't still use a "where x=NULL" clause, you must use ISNULL instead.
This could probably be an easy fix to do.




Submitted by: Massimo Dal Zotto <dz@cs.unitn.it>
This commit is contained in:
Marc G. Fournier
1996-07-19 07:24:11 +00:00
parent 83adddfcc3
commit 20288400f3
4 changed files with 34 additions and 4 deletions
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7
src/backend/parser/analyze.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.1.1.1 1996/07/09 06:21:39 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.2 1996/07/19 07:24:06 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@ -1313,6 +1313,11 @@ make_targetlist_expr(ParseState *pstate,
elog(WARN, "make_targetlist_expr: invalid use of NULL expression");
type_id = exprType(expr);
#ifdef NULL_PATCH
if (!type_id) {
type_len = 0;
} else
#endif
type_len = tlen(get_id_type(type_id));
/* I have no idea what the following does! */