From 2eb00d1ebac1898a26c7f2982923f088830967cc Mon Sep 17 00:00:00 2001
From: Sergei Golubchik <serg@mariadb.org>
Date: Mon, 5 Feb 2018 16:00:39 +0100
Subject: [PATCH] fix Item_window_func::print() not to crash before
 fix_fields()

because dbug_print_item() can be invoked any time in gdb,
also before fix_fields.

this fixes a crash of main.win in debug builds
---
 sql/item_windowfunc.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sql/item_windowfunc.cc b/sql/item_windowfunc.cc
index 27b007201c5..5fbfb2651af 100644
--- a/sql/item_windowfunc.cc
+++ b/sql/item_windowfunc.cc
@@ -440,5 +440,10 @@ void Item_window_func::print(String *str, enum_query_type query_type)
 {
   window_func()->print(str, query_type);
   str->append(" over ");
+#ifndef DBUG_OFF
+  if (!window_spec) // one can call dbug_print_item() anytime in gdb
+    str->append(window_name);
+  else
+#endif
   window_spec->print(str, query_type);
 }