Allow custom serdes to set field comments
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Key: HIVE-2171
URL: https://issues.apache.org/jira/browse/HIVE-2171
Project: Hive
Issue Type: Improvement
Reporter: Jakob Homan
Assignee: Jakob Homan
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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