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https://issues.apache.org/jira/browse/HIVE-957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783946#action_12783946
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Zheng Shao commented on HIVE-957:
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bq. Right now, we choose to use partition lever metadata. All metadata (column
names, column types, fileformat, serde class, serde properties) right now are
from partition level metadata. But hive does not support a method now to alter
all existing partitions' metadata, so users mostly choose to alter table
metadata, and think hive will use the new table level metadata.
In our environment, we have been seeing users calling "alter table" on
table-level meta data to:
* Replace the column separator for all partitions (because they created the
table with wrong separator)
* Append additional columns
* Rename existing columns
> Partiition Metadata and Table Metadata
> --------------------------------------
>
> Key: HIVE-957
> URL: https://issues.apache.org/jira/browse/HIVE-957
> Project: Hadoop Hive
> Issue Type: Bug
> Reporter: He Yongqiang
>
> Right now, we choose to use partition lever metadata. All metadata (column
> names, column types, fileformat, serde class, serde properties) right now are
> from partition level metadata. But hive does not support a method now to
> alter all existing partitions' metadata, so users mostly choose to alter
> table metadata, and think hive will use the new table level metadata.
> One approach is that we may need to provide a way to let user alter all
> partitions' metadata with one simple command. Right now a short term solution
> is to only get fileformat, serde class metadata from paritition level
> metadata, and use all other metadata from table.
> any comments?
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