[CASSANDRA-19615] Merge pre-existing schema with the system defined one during upgrade

• Type: Improvement
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 5.1-alpha1
• Component/s: Transactional Cluster Metadata
• Change Category: Semantic
• Complexity: Low Hanging Fruit
• Platform: All

Source Control Link

https://github.com/apache/cassandra/commit/4d29a1c75e4c7a5493d5601c7a907b75e042c5f9

Test and Documentation Plan

ci run

• Assignee: Marcus Eriksson
• Reporter: Marcus Eriksson

Authors

Marcus Eriksson

Reviewers

Sam Tunnicliffe

• Created: 03/May/24 08:23
• Updated: 3 days ago 11:25
• Resolved: 06/May/24 07:07

Description

When upgrading we should merge the pre-existing schema with the system-defined schema. For example, if a table was defined in 5.0 in system_distributed, but then removed from SystemDistributedKeyspace.java in 5.1 we should still be able to read it (until manually dropped).

Issue Links

• links to: GitHub Pull Request #3287