commit 1efa8023a1741fb79152f360e5c10392ccff8f6b
author drh <drh@noemail.net> Sat Apr 28 04:16:43 2018 +0000
committer drh <drh@noemail.net> Sat Apr 28 04:16:43 2018 +0000
tree 3662abcedac55949f46bf7638977f7b6a0a606f5
parent 6bfd973ce67980e5d09c8adfc465767297193573

Prevent deep recursions on nested COLLATE operators.

FossilOrigin-Name: 6e098ee415f1a530e17a942c9ba51d67c25a3ebff6b97377b7858d0b10bcec92

src/expr.c

diff --git a/src/expr.c b/src/expr.c
index 03fad6c..2d4a14c 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -3551,6 +3551,7 @@
     return 0;
   }
 
+expr_code_doover:
   if( pExpr==0 ){
     op = TK_NULL;
   }else{
@@ -4011,7 +4012,8 @@
     case TK_SPAN:
     case TK_COLLATE: 
     case TK_UPLUS: {
-      return sqlite3ExprCodeTarget(pParse, pExpr->pLeft, target);
+      pExpr = pExpr->pLeft;
+      goto expr_code_doover;
     }
 
     case TK_TRIGGER: {