[jira] [Resolved] (PHOENIX-294) Avoid adding delete markers for rows when dropping a column

["Gabriel Reid (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PHOENIX-294?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gabriel Reid resolved PHOENIX-294.
----------------------------------

    Resolution: Fixed

Bulk resolve of closed issues imported from GitHub. This status was reached by first re-opening all closed imported issues and then resolving them in bulk.

> Avoid adding delete markers for rows when dropping a column
> -----------------------------------------------------------
>
>                 Key: PHOENIX-294
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-294
>             Project: Phoenix
>          Issue Type: Task
>            Reporter: larsh
>
> Talked to James a bit. Currently when a column is dropped we place delete markers for this column on each row. This is very inefficient when there are many row.
> Another option is to drop the column from just the metadata.
> Since the schema is versioned the only problematic queries would be a wildcard (select * from...) queries.
> For those wildcard queries we can examine the current schema (at the appropriate timestamp) and expand the * to the actual set of columns.



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