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From "Ankit Singhal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-2565) Store data for immutable tables in single KeyValue
Date Thu, 29 Dec 2016 05:46:58 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-2565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15784585#comment-15784585
] 

Ankit Singhal commented on PHOENIX-2565:
----------------------------------------

[~tdsilva], we had both fixed and variable width datatypes. I'm not sure why we can't just
concatenate the bytes with a delimiter (including special encoding for null and tracking of
a length of fixed width datatype by schema ). 

Is the offset array used to optimised the reading 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: Thomas D'Silva
>         Attachments: PHOENIX-2565-v2.patch, PHOENIX-2565-wip.patch, PHOENIX-2565.patch
>
>
> 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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