rmbrust
Sent: Tuesday, December 22, 2015 12:52 AM
To: Roland Reumerman
Cc: dev@spark.apache.org
Subject: Re: Expression/LogicalPlan dichotomy in Spark SQL Catalyst
Why was the choice made in Catalyst to make LogicalPlan/QueryPlan and
Expression separate subclasses of TreeNode, instead of e.g
>
> Why was the choice made in Catalyst to make LogicalPlan/QueryPlan and
> Expression separate subclasses of TreeNode, instead of e.g. also make
> QueryPlan inherit from Expression?
>
I think this is a pretty common way to model things (glancing at postgres
it looks similar). Expression and plans
