[HIVE-21100] Allow flattening of table subdirectories resulted when using TEZ engine and UNION clause

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0
• Labels: pull-request-available
• Assignee: Ayush Saxena
• Reporter: George Pachitariu
• Created: 08/Jan/19 12:11
• Updated: 29/Mar/24 17:50
• Resolved: 22/Sep/23 09:29

Description

Right now, when writing data into a table with Tez engine and the clause UNION ALL is the last step of the query, Hive on Tez will create a subdirectory for each branch of the UNION ALL.

With this patch the subdirectories are removed, and the files are renamed and moved to the parent directory.

Issue Links

• links to: GitHub Pull Request #2921
• links to: GitHub Pull Request #4730