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https://issues.apache.org/jira/browse/HIVE-918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12775233#action_12775233
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Prasad Chakka commented on HIVE-918:
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Regarding metadata,
1) Every partition has its own Storage Descriptor object which contains
information about file descriptors, serdes and other storage related
information that a table can have. There is no need to add more metadata to
partition.
2) If we have 1) what is the need for this? Can we not get all the different
file formats that a table has by querying the storage descriptors of all
partitions of a table?
The plan for allowing metadata evolution is that the 'alter table ...' cmd
changes metadata for a table but not for existing partitions. All new
partitions inherit the new metadata of the table. Hive QL should figure out the
list of partitions that a query touches on using just the latest table metadata
and then fetch the partition metadata for any further stuff. Are we changing
this to something different, if so what?
> Allow partition-wise file format
> ---------------------------------
>
> Key: HIVE-918
> URL: https://issues.apache.org/jira/browse/HIVE-918
> Project: Hadoop Hive
> Issue Type: Improvement
> Reporter: He Yongqiang
> Assignee: He Yongqiang
>
> Right now all partitions in a hive table share the same file format. We
> should allow partition wise file format.
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