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https://issues.apache.org/jira/browse/HIVE-7971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14147461#comment-14147461
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Gunther Hagleitner commented on HIVE-7971:
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The patch looks good, but I added some follow up questions on rb. Maybe better
here:
- dynamic partition: You're saying that's not supported, is this at the parser
level? did you enable the flag?
- if that's not there, it will be hard to update all partitions (your decimal
use case), but that could be another jira/time
- default partition: You're saying this doesn't work. Without it you can't
completely update the table though, right? Is this easy to add?
- reordering has no effect: hm, this should be the serde that reconciles the
difference between table and schema right? If that's broken altogether then
probably just file another jira. I just want to make sure it's not just this
patch not updating all fields. Are there any serdes that work?
> Support alter table change/replace/add columns for existing partitions
> ----------------------------------------------------------------------
>
> Key: HIVE-7971
> URL: https://issues.apache.org/jira/browse/HIVE-7971
> Project: Hive
> Issue Type: Bug
> Reporter: Jason Dere
> Assignee: Jason Dere
> Attachments: HIVE-7971.1.patch, HIVE-7971.2.patch
>
>
> ALTER TABLE CHANGE COLUMN is allowed for tables, but not for partitions. Same
> for add/replace columns.
> Allowing this for partitions can be useful in some cases. For example, one
> user has tables with Hive 0.12 Decimal columns, which do not specify
> precision/scale. To be able to properly read the decimal values from the
> existing partitions, the column types in the partitions need to be changed to
> decimal types with precision/scale.
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