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_r358743857
 
 

 ##########
 File path: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
 ##########
 @@ -1868,9 +1868,9 @@ class Dataset[T] private[sql](
  /**
   * Define (named) metrics to observe on the Dataset. This method returns an 
'observed' Dataset
   * that returns the same result as the input, with the following guarantees:
-  * - It will compute the defined aggregates (metrics) on all the data that is 
flowing through the
+  *  - It will compute the defined aggregates (metrics) on all the data that 
is flowing through the
   *   Dataset at that point.
-  * - It will report the value of the defined aggregate columns as soon as we 
reach a completion
+  *  - It will report the value of the defined aggregate columns as soon as we 
reach a completion
 
 Review comment:
   To make completely fix it, you gotta use HTML tag to render properly in both 
javadoc and scaladoc. See 
https://github.com/apache/spark/blob/9dedfeffaa27a00f719b5a50ce1692f6a0ad665d/sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala#L527-L536
 as an example.
   
   You can simply revert this change too here.

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