andygrove opened a new issue, #180:
URL: https://github.com/apache/arrow-ballista/issues/180
**Describe the bug**
I am trying to run the following query in Ballista:
```
>>> ctx.sql("SELECT CASE WHEN x > 5 THEN x ELSE NULL END from y limit
10").show()
```
It fails with:
```
Exception: Internal error: failed to serialize logical plan: Plan("NULL is
invalid as a DataFusion scalar value"). This was likely caused by a bug in
DataFusion's code and we would welcome that you file an bug report in our issue
tracker
```
The same query is working for me with DataFusion 11.0.0
**To Reproduce**
See above
**Expected behavior**
Should work
**Additional context**
None
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