hsyuan opened a new pull request #1546: [CALCITE-3458] Remove desc in 
AbstractRelNode
URL: https://github.com/apache/calcite/pull/1546
 
 
   If the query is super large, e.g. contains tens of thousands of nodes or
   expressions, the RelNode digest and desc become very large. The content of 
desc
   and digest are almost the same, except that desc consists of id plus digest. 
So
   remove desc, just use id + digest to produce description.

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