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https://issues.apache.org/jira/browse/SPARK-14088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15207674#comment-15207674
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Apache Spark commented on SPARK-14088:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/11908
> Some Dataset API touch-up
> -------------------------
>
> Key: SPARK-14088
> URL: https://issues.apache.org/jira/browse/SPARK-14088
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
> Fix For: 2.0.0
>
>
> 1. Deprecated unionAll. It is pretty confusing to have both "union" and
> "unionAll" when the two do the same thing in Spark but are different in SQL.
> 2. Rename reduce in KeyValueGroupedDataset to reduceGroups so it is more
> consistent with rest of the functions in KeyValueGroupedDataset. Also makes
> it more obvious what "reduce" and "reduceGroups" mean. Previously it was
> confusing because it could be reducing a Dataset, or just reducing groups.
> 3. Added a "name" function, which is more natural to name columns than "as"
> for non-SQL users.
> 4. Remove "subtract" function since it is just an alias for "except".
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