database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-10-21 11:13:54 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

6
src/func.c
View File

@@ -16,7 +16,7 @@
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.18 2002/05/29 23:22:23 drh Exp $
** $Id: func.c,v 1.19 2002/05/31 15:51:25 drh Exp $
*/
#include <ctype.h>
#include <math.h>
@@ -362,7 +362,7 @@ static void minStep(sqlite_func *context, int argc, const char **argv){
MinMaxCtx *p;
p = sqlite_aggregate_context(context, sizeof(*p));
if( p==0 || argc<1 || argv[0]==0 ) return;
if( sqlite_aggregate_count(context)==1 || sqliteCompare(argv[0],p->z)<0 ){
if( p->z==0 || sqliteCompare(argv[0],p->z)<0 ){
int len;
if( p->z && p->z!=p->zBuf ){
sqliteFree(p->z);
@@ -381,7 +381,7 @@ static void maxStep(sqlite_func *context, int argc, const char **argv){
MinMaxCtx *p;
p = sqlite_aggregate_context(context, sizeof(*p));
if( p==0 || argc<1 || argv[0]==0 ) return;
if( sqlite_aggregate_count(context)==1 || sqliteCompare(argv[0],p->z)>0 ){
if( p->z==0 || sqliteCompare(argv[0],p->z)>0 ){
int len;
if( p->z && p->z!=p->zBuf ){
sqliteFree(p->z);