database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-18 10:21:03 +03:00
Code Activity

Improved comments on one routine in the query planner. Improved diagnostic

Browse Source 
output for ".wheretrace".  No production code changes.

FossilOrigin-Name: 946b87a5282f00d8c532a51f4390e6de781b9a0d6626cb3c077c5622895dc540
This commit is contained in:
drh
2017-05-19 20:55:04 +00:00
parent 748465b49e
commit bcbb066534
3 changed files with 17 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
src/where.c
View File

@@ -1945,16 +1945,17 @@ static void whereLoopAdjustCost(const WhereLoop *p, WhereLoop *pTemplate){
/*
** Search the list of WhereLoops in *ppPrev looking for one that can be
** supplanted by pTemplate.
** replaced by pTemplate.
**
** Return NULL if the WhereLoop list contains an entry that can supplant
** pTemplate, in other words if pTemplate does not belong on the list.
** Return NULL if pTemplate does not belong on the WhereLoop list.
** In other words if pTemplate ought to be dropped from further consideration.
**
** If pX is a WhereLoop that pTemplate can supplant, then return the
** If pX is a WhereLoop that pTemplate can replace, then return the
** link that points to pX.
**
** If pTemplate cannot supplant any existing element of the list but needs
** to be added to the list, then return a pointer to the tail of the list.
** If pTemplate cannot replace any existing element of the list but needs
** to be added to the list as a new entry, then return a pointer to the
** tail of the list.
*/
static WhereLoop **whereLoopFindLesser(
WhereLoop **ppPrev,
@@ -2099,8 +2100,10 @@ static int whereLoopInsert(WhereLoopBuilder *pBuilder, WhereLoop *pTemplate){
if( p!=0 ){
sqlite3DebugPrintf("replace: ");
whereLoopPrint(p, pBuilder->pWC);
sqlite3DebugPrintf(" with: ");
}else{
sqlite3DebugPrintf(" add: ");
}
sqlite3DebugPrintf(" add: ");
whereLoopPrint(pTemplate, pBuilder->pWC);
}
#endif