Github user kiszk commented on the issue:

    https://github.com/apache/spark/pull/21031
  
    According to my understanding, these activities are to improve 
compatibility with other DBs (like Presto) in 
https://issues.apache.org/jira/browse/SPARK-23899 and 
https://issues.apache.org/jira/browse/SPARK-23923.
    
    As you pointed out, `cardinality` and `size` has the same except data type. 
I used the same implementation.
    
    @gatorsmile what do you think?


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