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https://issues.apache.org/jira/browse/PHOENIX-294?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James Taylor reopened PHOENIX-294:
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> 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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