[GitHub] [spark] cloud-fan commented on a change in pull request #25355: [SPARK-28615][SQL][DOCS] Add a guide line for dataframe functions to say column signature function is by default

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cloud-fan commented on a change in pull request #25355: [SPARK-28615][SQL][DOCS] Add a guide line for dataframe functions to say column signature function is by default
URL: https://github.com/apache/spark/pull/25355#discussion_r310559578
 
 

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 File path: sql/core/src/main/scala/org/apache/spark/sql/functions.scala
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 @@ -55,6 +55,9 @@ import org.apache.spark.util.Utils
  * `regr_count` is an example of a function that is built-in but not defined here, because it is
  * less commonly used. To invoke it, use `expr("regr_count(yCol, xCol)")`.
  *
+ * We add these functions with `Column` type arguments by default. All the other variants are there
 
 Review comment:
   +1

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