Github user juliuszsompolski commented on the issue:
https://github.com/apache/spark/pull/23152
This reproes it:
```
sql("create table all_null (attr1 int, attr2 int)")
sql("insert into all_null values (null, null)")
sql("analyze table all_null compute statistics for columns attr1,
attr2")
// check if the stats can be calculated without Cast exception.
sql("select * from all_null where attr1 <
attr2").queryExecution.stringWithStats
```
Could we piggy back this fix here?
Sorry for posting last minute after lgtm.
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