commit 9854260bcaa2c049e9d323a39a44f7d75365c820
author drh <drh@noemail.net> Sat Aug 20 17:00:16 2016 +0000
committer drh <drh@noemail.net> Sat Aug 20 17:00:16 2016 +0000
tree 2879b6614b0dcbb788732773a39640f56acaa7d1
parent f358009a93556ba3f2b71de5354168bd65c49452

Do not duplicate the Expr.pLeft subtree of a TK_SELECT_COLUMN node.

FossilOrigin-Name: 8384c77ebb3f65fbc54c199885926f2066f0b140

src/expr.c

diff --git a/src/expr.c b/src/expr.c
index 0412919..bd2426a 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -1205,7 +1205,11 @@
       }
     }else{
       if( !ExprHasProperty(p, EP_TokenOnly) ){
-        pNew->pLeft = sqlite3ExprDup(db, p->pLeft, 0);
+        if( pNew->op==TK_SELECT_COLUMN ){
+          pNew->pLeft = p->pLeft;
+        }else{
+          pNew->pLeft = sqlite3ExprDup(db, p->pLeft, 0);
+        }
         pNew->pRight = sqlite3ExprDup(db, p->pRight, 0);
       }
     }