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Commit2028840

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committed
Fixes:
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 beendisabled because not completely debugged, I believe. My patches simply addsome checks here and there. To enable the new code you must add -DNULL_PATCHto 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>
1 parent83adddf commit2028840

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4 files changed

+34
-4
lines changed

4 files changed

+34
-4
lines changed

‎src/backend/parser/analyze.c‎

Lines changed: 6 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
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*
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* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.1.1.1 1996/07/09 06:21:39 scrappy Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.2 1996/07/19 07:24:06 scrappy Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -1313,6 +1313,11 @@ make_targetlist_expr(ParseState *pstate,
13131313
elog(WARN,"make_targetlist_expr: invalid use of NULL expression");
13141314

13151315
type_id=exprType(expr);
1316+
#ifdefNULL_PATCH
1317+
if (!type_id) {
1318+
type_len=0;
1319+
}else
1320+
#endif
13161321
type_len=tlen(get_id_type(type_id));
13171322

13181323
/* I have no idea what the following does! */

‎src/backend/parser/catalog_utils.c‎

Lines changed: 6 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,7 @@
66
*
77
*
88
* IDENTIFICATION
9-
* $Header: /cvsroot/pgsql/src/backend/parser/Attic/catalog_utils.c,v 1.1.1.1 1996/07/09 06:21:40 scrappy Exp $
9+
* $Header: /cvsroot/pgsql/src/backend/parser/Attic/catalog_utils.c,v 1.2 1996/07/19 07:24:08 scrappy Exp $
1010
*
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*-------------------------------------------------------------------------
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*/
@@ -471,6 +471,11 @@ oper(char *op, int arg1, int arg2)
471471
CandidateListcandidates;
472472
intncandidates;
473473

474+
#ifdefNULL_PATCH
475+
if (!arg2)arg2=arg1;
476+
if (!arg1)arg1=arg2;
477+
#endif
478+
474479
if (!(tup=SearchSysCacheTuple(OPRNAME,
475480
PointerGetDatum(op),
476481
ObjectIdGetDatum(arg1),

‎src/backend/parser/parse_query.c‎

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/parser/Attic/parse_query.c,v 1.1.1.1 1996/07/09 06:21:40 scrappy Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/parser/Attic/parse_query.c,v 1.2 1996/07/19 07:24:09 scrappy Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -617,7 +617,11 @@ make_const(Value *value)
617617

618618
/* null const */
619619
con=makeConst(0,0, (Datum)NULL, TRUE,0, FALSE);
620+
#ifdefNULL_PATCH
621+
returncon;
622+
#else
620623
returnNULL/*con*/;
624+
#endif
621625
}
622626
}
623627

‎src/backend/parser/parser.c‎

Lines changed: 17 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,7 @@
66
*
77
*
88
* IDENTIFICATION
9-
* $Header: /cvsroot/pgsql/src/backend/parser/parser.c,v 1.1.1.1 1996/07/09 06:21:40 scrappy Exp $
9+
* $Header: /cvsroot/pgsql/src/backend/parser/parser.c,v 1.2 1996/07/19 07:24:11 scrappy Exp $
1010
*
1111
*-------------------------------------------------------------------------
1212
*/
@@ -302,6 +302,10 @@ parser_typecast2(Node *expr, int exprType, Type tp, int typlen)
302302
Assert(IsA(expr,Const));
303303

304304
switch (exprType) {
305+
#ifdefNULL_PATCH
306+
case0:/* NULL */
307+
break;
308+
#endif
305309
case23:/* int4 */
306310
const_string= (char*)palloc(256);
307311
string_palloced= true;
@@ -352,6 +356,18 @@ parser_typecast2(Node *expr, int exprType, Type tp, int typlen)
352356
elog(WARN,"unknown type%d ",exprType);
353357
}
354358

359+
#ifdefNULL_PATCH
360+
if (!exprType) {
361+
adt=makeConst((Oid)typeid(tp),
362+
(Size)0,
363+
(Datum)NULL,
364+
true,/* isnull */
365+
0/* was omitted */,
366+
0/* not a set */);
367+
return ((Node*)adt);
368+
}
369+
#endif
370+
355371
cp=instr2 (tp,const_string,typlen);
356372

357373

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