Using "SELECT ALL" instead of just "SELECT" on a query that uses a single

unflattenable subquery or view in its FROM clause will force the subquery to
be manifested into a temporary table rather than run incrementally using a
co-routine.  This is a stop-gap means of controlling the decision to manifest
while we try to work out a better to make that decision automatically.

FossilOrigin-Name: a29e117d7ecec05da949348689dbfb0d3acb1280

src/select.c

@@ -4817,6 +4817,7 @@ int sqlite3Select(
       }
       i = -1;
     }else if( pTabList->nSrc==1
+           && (p->selFlags & SF_All)==0
            && OptimizationEnabled(db, SQLITE_SubqCoroutine)
     ){
       /* Implement a co-routine that will return a single row of the result