yeshengm opened a new pull request #24866: [WIP][SQL] Micro-optimization to 
avoid expensive reference computation in QueryPlan and Expression
URL: https://github.com/apache/spark/pull/24866
 
 
   ## What changes were proposed in this pull request?
   
   The original `references` implementation in a few `QueryPlan` and 
`Expression` classes are methods, which means unnecessary re-computation can 
happen at times. This PR resolves this problem by making these method `lazy 
val`s.
   
   Pending benchmark results.
   
   ## How was this patch tested?
   
   Existing UTs.

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