Use the sqlite3ParserAddCleanup() mechanism to ensure that the AggInfo

structure associated with an aggregate query is deallocated, for a performance
increase and size reduction.

FossilOrigin-Name: 7a1399671fa10c64d5358cc4d364d24c643fe9dd8da923356462267ee7962f61

src/select.c

@@ -5793,6 +5793,15 @@ static struct SrcList_item *isSelfJoinView(
   return 0;
 }
 
+/*
+** Deallocate a single AggInfo object
+*/
+static void agginfoFree(sqlite3 *db, AggInfo *p){
+  sqlite3DbFree(db, p->aCol);
+  sqlite3DbFree(db, p->aFunc);
+  sqlite3DbFreeNN(db, p);
+}
+
 #ifdef SQLITE_COUNTOFVIEW_OPTIMIZATION
 /*
 ** Attempt to transform a query of the form
@@ -6537,11 +6546,13 @@ int sqlite3Select(
     ** SELECT statement.
     */
     pAggInfo = sqlite3DbMallocZero(db, sizeof(*pAggInfo) );
-    if( pAggInfo==0 ){
+    if( pAggInfo ){
+      sqlite3ParserAddCleanup(pParse,
+          (void(*)(sqlite3*,void*))agginfoFree, pAggInfo);
+    }
+    if( db->mallocFailed ){
       goto select_end;
     }
-    pAggInfo->pNext = pParse->pAggList;
-    pParse->pAggList = pAggInfo;
     pAggInfo->selId = p->selId;
     memset(&sNC, 0, sizeof(sNC));
     sNC.pParse = pParse;