[jira] [Commented] (PHOENIX-2565) Store data for immutable tables in single KeyValue

["ramkrishna.s.vasudevan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PHOENIX-2565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15091634#comment-15091634 ] 

ramkrishna.s.vasudevan commented on PHOENIX-2565:
-------------------------------------------------

Before starting up with one -  currently if we declare a table with IMMUTABLE_ROWS = true, if we try do an update to the table to the same row - do we throw any exception or it just works fine?  Is this property only useful in case of Index so that the index need not be updated every time?

> Store data for immutable tables in single KeyValue
> --------------------------------------------------
>
>                 Key: PHOENIX-2565
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-2565
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: James Taylor
>            Assignee: ramkrishna.s.vasudevan
>
> Since an immutable table (i.e. declared with IMMUTABLE_ROWS=true) will never update a column value, it'd be more efficient to store all column values for a row in a single KeyValue. We could use the existing format we have for variable length arrays.
> For backward compatibility, we'd need to support the current mechanism. Also, you'd no longer be allowed to transition an existing table to/from being immutable. I think the best approach would be to introduce a new IMMUTABLE keyword and use it like this:
> {code}
> CREATE IMMUTABLE TABLE ...
> {code}



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