[DRILL-7089] Implement caching of BaseMetadata classes

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.16.0
• Fix Version/s: 1.16.0
• Component/s: Metadata
• Labels: ready-to-commit
• Assignee: Vova Vysotskyi
• Reporter: Vova Vysotskyi
• Reviewer: Aman Sinha
• Created: 11/Mar/19 10:09
• Updated: 10/Apr/19 01:29
• Resolved: 10/Apr/19 01:29

Description

In the scope of DRILL-6852 were introduced new classes for metadata usage. These classes may be reused in other GroupScan instances to preserve heap usage for the case when metadata is large.

The idea is to store BaseMetadata inheritors in DrillTable and pass them to the GroupScan, so in the scope of the single query, it will be possible to reuse them.

Issue Links

• links to: Class diagram
• links to: GitHub Pull Request #1728