Github user rxin commented on the issue:
https://github.com/apache/spark/pull/21482
@henryr 1.0/0.0 also returns null in Spark SQL ...
```
scala> sql("select cast(1.0 as double)/cast(0 as double)").show()
+-----------------------------------------+
|(CAST(1.0 AS DOUBLE) / CAST(0 AS DOUBLE))|
+-----------------------------------------+
| null|
+-----------------------------------------+
```
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