[jira] [Created] (PHOENIX-6186) Store table metadata last modified timestamp in PTable / System.Catalog

["Geoffrey Jacoby (Jira)" <ji...@apache.org>]

Geoffrey Jacoby created PHOENIX-6186:
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             Summary: Store table metadata last modified timestamp in PTable / System.Catalog
                 Key: PHOENIX-6186
                 URL: https://issues.apache.org/jira/browse/PHOENIX-6186
             Project: Phoenix
          Issue Type: New Feature
            Reporter: Geoffrey Jacoby
            Assignee: Geoffrey Jacoby
             Fix For: 4.16.0


There are many reasons why it's useful to know when a particular table's metadata was last modified. It's helpful when solving cache coherency problems, and also in order to interact with external schema registries which may have multiple versions of a particular schema and require a timestamp to resolve ambiguities. 

This JIRA will add a last modified timestamp field to System.Catalog, to be updated both when creating a table/view and also when adding or removing a column. Changing purely internal Phoenix properties will not update the timestamp. 



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