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Refinements to NULL processing: NULLs are indistinct for DISTINCT and UNION.

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Multiplying a NULL by zero yields zero. In a CASE expression, a NULL comparison
is considered false, not NULL.  With these changes, NULLs in SQLite now work
the same as in PostgreSQL and in Oracle. (CVS 600)

FossilOrigin-Name: da61aa1d238539dff9c43fd9f464d311e28d669f
This commit is contained in:
drh
2002-05-31 15:51:25 +00:00
parent 0f89253e21
commit f570f011eb
11 changed files with 279 additions and 59 deletions
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9
src/util.c
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@@ -14,7 +14,7 @@
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
** $Id: util.c,v 1.44 2002/05/26 21:34:58 drh Exp $
** $Id: util.c,v 1.45 2002/05/31 15:51:25 drh Exp $
*/
#include "sqliteInt.h"
#include <stdarg.h>
@@ -728,6 +728,13 @@ int sqliteSortCompare(const char *a, const char *b){
int isNumA, isNumB;
while( res==0 && *a && *b ){
if( a[1]==0 ){
res = -1;
break;
}else if( b[1]==0 ){
res = +1;
break;
}
isNumA = sqliteIsNumber(&a[1]);
isNumB = sqliteIsNumber(&b[1]);
if( isNumA ){