database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-10-24 09:53:10 +03:00
Code Activity

A SUM() of all NULLs returns NULL. A SUM() of nothing return 0.

Browse Source 
A SUM() of a mixture of NULLs and numbers returns the sum of the
numbers.  Ticket #1413. (CVS 2677)

FossilOrigin-Name: 2e6230edfd651b40481ebad8aa01a22ac92ce80c
This commit is contained in:
drh
2005-09-08 19:45:57 +00:00
parent 825c662e66
commit 3f219f46fc
5 changed files with 46 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
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 1.108 2005/09/08 10:37:01 drh Exp $
** $Id: func.c,v 1.109 2005/09/08 19:45:58 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
@@ -819,7 +819,7 @@ typedef struct SumCtx SumCtx;
struct SumCtx {
double sum; /* Sum of terms */
int cnt; /* Number of elements summed */
int isFloat; /* True if there has been any floating point value */
u8 seenFloat; /* True if there has been any floating point value */
};
/*
@@ -828,13 +828,15 @@ struct SumCtx {
static void sumStep(sqlite3_context *context, int argc, sqlite3_value **argv){
SumCtx *p;
int type;
if( argc<1 ) return;
assert( argc==1 );
p = sqlite3_aggregate_context(context, sizeof(*p));
type = sqlite3_value_type(argv[0]);
if( p && type!=SQLITE_NULL ){
p->sum += sqlite3_value_double(argv[0]);
p->cnt++;
if( type==SQLITE_FLOAT ) p->isFloat = 1;
if( type==SQLITE_FLOAT ){
p->seenFloat = 1;
}
}
}
static void sumFinalize(sqlite3_context *context){
@@ -842,9 +844,9 @@ static void sumFinalize(sqlite3_context *context){
p = sqlite3_aggregate_context(context, 0);
if( p==0 ){
sqlite3_result_int(context, 0);
}else if( p->isFloat ){
}else if( p->seenFloat ){
sqlite3_result_double(context, p->sum);
}else{
}else if( p->cnt>0 ){
sqlite3_result_int64(context, (i64)p->sum);
}
}