zero323 edited a comment on pull request #30107:
URL: https://github.com/apache/spark/pull/30107#issuecomment-713155178
I have mixed feelings about this. At the moment we can easily use `when` to
handle this use case
```scala
count(when(df("id") < 50, 1))
```
It doesn't require extensions of the DSL, and it is in practice as concise
and (arguably) as readable as the proposed addition.
**Edit**
It is also straightforward to use FILTER within expr
```scala
expr("count(1) FILTER (WHERE id < 50)")
```
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