xianyinxin commented on issue #24983: [SPARK-27714][SQL][CBO] Support Genetic 
Algorithm based join reorder
URL: https://github.com/apache/spark/pull/24983#issuecomment-521858016
   > I have not read the code yet. This plan is randomly generated. Are we able 
to make it deterministic when users setting a seed? When users do not set the 
seed, we should still record the seed we use for reproducing the plan. 
Otherwise, it will be very hard for the developers to debug it if the plan 
keeps changing each time.
   It's a good idea, and it's necessary for the ut too. Will consider to 
implement it.

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