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https://issues.apache.org/jira/browse/HIVE-2171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13060219#comment-13060219
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Jakob Homan commented on HIVE-2171:
-----------------------------------
bq. hive already stores each column's comment in StorageDescriptor. Can we get
the comments from there instead of putting it to StructField?
Hive stores column information for native serdes (see
[SerDeUtils.java:99|https://github.com/apache/hive/blob/trunk/metastore/src/java/org/apache/hadoop/hive/metastore/HiveMetaStore.java#L1889]).
For non-native serdes, it queries the serde's object inspector, which is what
this patch is dealing with.
> Allow custom serdes to set field comments
> -----------------------------------------
>
> Key: HIVE-2171
> URL: https://issues.apache.org/jira/browse/HIVE-2171
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 0.7.0
> Reporter: Jakob Homan
> Assignee: Jakob Homan
> Attachments: HIVE-2171.patch
>
>
> Currently, while serde implementations can set a field's name, they can't set
> its comment. These are set in the metastore utils to {{(from
> deserializer)}}. For those serdes that can provide meaningful comments for a
> field, they should be propagated to the table description. These
> serde-provided comments could be prepended to "(from deserializer)" if others
> feel that's a meaningful distinction. This change involves updating
> {{StructField}} to support a (possibly null) comment field and then
> propagating this change out to the myriad places {{StructField}} is thrown
> around.
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