HyukjinKwon commented on a change in pull request #26922: [MINOR][SQL][DOC] Fix
some ambiguous descriptions and format issue in Dataset API Doc
URL: https://github.com/apache/spark/pull/26922#discussion_r358766008
##########
File path: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
##########
@@ -2498,6 +2503,10 @@ class Dataset[T] private[sql](
*
* Use [[summary]] for expanded statistics and control over which statistics
to compute.
*
+ * @note String columns will be implicitly cast to double when performing
operations like mean
Review comment:
But this applies to all other stddev and mean functions too:
```scala
scala> sql("select mean('1.0')").show()
+------------------------+
|avg(CAST(1.0 AS DOUBLE))|
+------------------------+
| 1.0|
+------------------------+
```
I would locate the note in a better place to deduplicate the documentation.
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