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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