draw a graph to show the relationship between Group and Expression

pingcap · Aug 30, 2018 · aa8864a · CaitinChen · Aug 30, 2018 · aa8864a
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diff --git a/docs/design/2018-08-29-new-planner.md b/docs/design/2018-08-29-new-planner.md
@@ -61,6 +61,8 @@ operator.
   With the concept of **Group** and **Group Expression**, all the logically
   equivalent expressions can be stored in a root Group.
 
+  ![group and expression](./group-and-expression.png)
+
 - **Transformation Rule**
 
   The transform rule is used to transform a logical plan to another equivalent

diff --git a/docs/design/group-and-expression.png b/docs/design/group-and-expression.png