[HIVE-22046] Differentiate among column stats computed by different engines

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0-alpha-1
• Component/s: Metastore
• Labels: pull-request-available
• Target Version/s: 4.0.0
• Assignee: Jesús Camacho Rodríguez
• Reporter: Jesús Camacho Rodríguez
• Created: 25/Jul/19 01:29
• Updated: 27/Feb/24 22:23
• Resolved: 06/Aug/19 06:12

Description

The goal is to avoid computation of column stats by engines to step on each other, e.g., Hive and Impala. In longer term, we may introduce a common representation for the column statistics stored by different engines.

For this issue, we will add a new column 'engine' to TAB_COL_STATS HMS table (unpartitioned tables) and to PART_COL_STATS HMS table (partitioned tables). This will prevent conflicts at the column level stats.

Issue Links

• is related to: HIVE-27984 Support backward compatibility of hms thrift struct about column stats
• links to: GitHub Pull Request #741