[SPARK-14088] Some Dataset API touch-up

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Component/s: SQL
• Target Version/s: 2.0.0
• Assignee: Reynold Xin
• Reporter: Reynold Xin
• Created: 23/Mar/16 01:21
• Updated: 23/Mar/16 06:43
• Resolved: 23/Mar/16 06:43

Description

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".

Issue Links

• links to: [Github] Pull Request #11908 (rxin)