Case should not be significant when comparing function names.

FossilOrigin-Name: e2f1caf117b0a9632d52246717ab202852982339
diff --git a/src/expr.c b/src/expr.c
index 9ae611b..ee3fb1a 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -3788,7 +3788,9 @@
     return 2;
   }
   if( pA->op!=TK_COLUMN && ALWAYS(pA->op!=TK_AGG_COLUMN) && pA->u.zToken ){
-    if( strcmp(pA->u.zToken,pB->u.zToken)!=0 ){
+    if( pA->op==TK_FUNCTION ){
+      if( sqlite3StrICmp(pA->u.zToken,pB->u.zToken)!=0 ) return 2;
+    }else if( strcmp(pA->u.zToken,pB->u.zToken)!=0 ){
       return pA->op==TK_COLLATE ? 1 : 2;
     }
   }