From 42ededf4adaed7595a5843a8fbf09fe246a1c3f0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vicen=C8=9Biu=20Ciorbaru?= <cvicentiu@gmail.com>
Date: Mon, 7 Mar 2016 12:30:04 +0200
Subject: [PATCH] Create a default frame bound when no frame is specified.

---
 sql/sql_window.cc | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/sql/sql_window.cc b/sql/sql_window.cc
index cb4e1b6e0e0..3ccf35a2ed4 100644
--- a/sql/sql_window.cc
+++ b/sql/sql_window.cc
@@ -752,6 +752,18 @@ public:
 
 Frame_cursor *get_frame_cursor(Window_frame *frame, bool is_top_bound)
 {
+  // TODO-cvicentiu When a frame is not specified, which is the frame type
+  // that we will use?
+  // Postgres uses RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW.
+  // For now we use UNBOUNDED FOLLOWING and UNBOUNDED PRECEDING.
+  if (!frame)
+  {
+    if (is_top_bound)
+      return new Frame_unbounded_preceding;
+    else
+      return new Frame_unbounded_following;
+  }
+
   Window_frame_bound *bound= is_top_bound? frame->top_bound :
                                            frame->bottom_bound;