Github user maropu commented on the issue:
https://github.com/apache/spark/pull/21598
It seems we don't any behaviour change in current pr (IIUC
`spark.sql.legacy.sizeOfNull=true` keeps the current behaviour). If so, we
don't need that update?
But, is it okay to set true at this option by default? Based on the
three-value logic, `size(null)=null` is more reasonable?
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