[IMPALA-7540] Intern common strings in catalog

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 3.1.0
• Fix Version/s: Impala 3.2.0
• Epic Color: ghx-label-2
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 06/Sep/18 01:21
• Updated: 10/Apr/19 15:43
• Resolved: 10/Apr/19 15:43

Description

Using jxray shows that there are many common duplicate strings in the catalog. For example, each table repeats the database name, and metadata like the HMS parameter maps reuse a lot of common strings like "EXTERNAL" or "transient_lastDdlTime". We should intern these to save memory.