[HIVE-21443] Better usability for SHOW COMPACTIONS

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0-alpha-1
• Component/s: Transactions
• Assignee: Peter Vary
• Reporter: Todd Lipcon
• Created: 13/Mar/19 18:40
• Updated: 17/Nov/22 08:50
• Resolved: 03/Apr/19 08:04

Description

Currently on a test cluster the output of 'SHOW COMPACTIONS' has 117k rows. This makes it basically useless to work with.

For better usability, we should support syntax like 'SHOW COMPACTIONS IN <database>' or maybe 'SHOW COMPACTIONS ON <table>' (particular syntax to be chosen for consistency with other operations I suppose).

Alternatively (or maybe in addition) it seems like it would be nice to expose the same data in a queryable table (eg in information_schema or a system namespace) so that I could do things like: SELECT dbname, state, count from compactions group by 1,2;