[
https://issues.apache.org/jira/browse/CASSANDRA-3919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13604112#comment-13604112
]
Aleksey Yeschenko edited comment on CASSANDRA-3919 at 3/16/13 4:27 AM:
-----------------------------------------------------------------------
https://github.com/iamaleksey/cassandra/compare/3919
- ALTER TABLE DROP is limited to CQL3 tables (composite && !compact)
- dropped columns are stored as a map<column, dropped_time>
- the map is a json pseudomap, not a collection. let's convert everything in
one go in CASSANDRA-4603
- for compaction, it seems like modifying CFS.removeDeletedStandard() alone is
enough
Tested modified compaction manually before implementing extra-filtering in
reads, tested reads manually (+ collection updates that require
read-before-write). Everything seems to work.
What's left:
- write dtests for reads
- write unit tests for compaction leaving out dropped columns (can't be a dtest)
- update cqlsh help
- update CQL3 doc
Will do these after the patch is committed, but before resolving the issue in
jira.
was (Author: iamaleksey):
https://github.com/iamaleksey/cassandra/compare/3919
- ALTER TABLE RENAME is limited to CQL3 tables (composite && !compact)
- dropped columns are stored as a map<column, dropped_time>
- the map is a json pseudomap, not a collection. let's convert everything in
one go in CASSANDRA-4603
- for compaction, it seems like modifying CFS.removeDeletedStandard() alone is
enough
Tested modified compaction manually before implementing extra-filtering in
reads, tested reads manually (+ collection updates that require
read-before-write). Everything seems to work.
What's left:
- write dtests for reads
- write unit tests for compaction leaving out dropped columns (can't be a dtest)
- update cqlsh help
- update CQL3 doc
Will do these after the patch is committed, but before resolving the issue in
jira.
> Dropping a column should do more than just remove the definition
> ----------------------------------------------------------------
>
> Key: CASSANDRA-3919
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3919
> Project: Cassandra
> Issue Type: Sub-task
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Aleksey Yeschenko
> Labels: compaction, cql
> Fix For: 1.2.4
>
>
> Dropping a column should:
> - immediately make it unavailable for {{SELECT}}, including {{SELECT *}}
> - eventually (i.e., post-compaction) reclaim the space formerly used by that
> column
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
