yaooqinn 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_r358764073
##########
File path: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
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@@ -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:
This method accept numeric and string, I guess this note help us understand
the string stat output. For sepecific functions, the implicit casting happens
not only for string only.
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