database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-08-05 15:55:57 +03:00
Code Activity

Attempt to omit ORDER BY clauses from FROM-clause subqueries if those ORDER BY

Browse Source 
clauses do not affect the output.  See
[forum:/forumpost/2d76f2bcf65d256a|forum thread 2d76f2bcf65d256a] for
discussion.  This can help the query flattener in
some cases, resulting in faster query plans.  The current implemention does
not always work.

FossilOrigin-Name: ef97c3e7c3ea2cf1a4db6591328fe7ce3f1d189afc2d578159135824ec89e620
This commit is contained in:
drh
2021-07-15 19:29:43 +00:00
parent 480f5e3e6e
commit bb30123178
7 changed files with 98 additions and 57 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/window.c
View File

@@ -1070,7 +1070,7 @@ int sqlite3WindowRewrite(Parse *pParse, Select *p){
Table *pTab2;
p->pSrc->a[0].pSelect = pSub;
sqlite3SrcListAssignCursors(pParse, p->pSrc);
pSub->selFlags |= SF_Expanded;
pSub->selFlags |= SF_Expanded|SF_OrderByReqd;
pTab2 = sqlite3ResultSetOfSelect(pParse, pSub, SQLITE_AFF_NONE);
pSub->selFlags |= (selFlags & SF_Aggregate);
if( pTab2==0 ){