commit 4910a76d4501b11fdc639c01e531d5100401b444
author drh <drh@noemail.net> Sat Sep 03 01:46:15 2016 +0000
committer drh <drh@noemail.net> Sat Sep 03 01:46:15 2016 +0000
tree 5e8bf07fb5d52ea9b6b2b510bef61eaad5692128
parent 55a6f6dc7276842721dd086289c407510080e4fe

Performance optimizations.

FossilOrigin-Name: f1d06c49ba0d814dc7ffb538aac3f4e6251fd8f0

src/expr.c

diff --git a/src/expr.c b/src/expr.c
index 8e74fff..31df95c 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -1021,7 +1021,7 @@
   if( !ExprHasProperty(p, EP_TokenOnly) ){
     /* The Expr.x union is never used at the same time as Expr.pRight */
     assert( p->x.pList==0 || p->pRight==0 );
-    if( p->op!=TK_SELECT_COLUMN ) sqlite3ExprDelete(db, p->pLeft);
+    if( p->pLeft && p->op!=TK_SELECT_COLUMN ) sqlite3ExprDeleteNN(db, p->pLeft);
     sqlite3ExprDelete(db, p->pRight);
     if( ExprHasProperty(p, EP_MemToken) ) sqlite3DbFree(db, p->u.zToken);
     if( ExprHasProperty(p, EP_xIsSelect) ){