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https://issues.apache.org/jira/browse/HIVE-17713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16644206#comment-16644206
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Shawn Weeks commented on HIVE-17713:
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While I understand why you wouldn't want this for files that embed or reference
an external schema, whats the reason for file formats backed by things like the
OpenCSVSerde, MultiDelimiterSerde and RegexSerde. Their schema isn't being
derived external and they're generally just specialized replacements for the
default LazySimpleSerde.
> disallow adding/modifying columns in metastore for Avro/CSV/etc. SerDes
> -----------------------------------------------------------------------
>
> Key: HIVE-17713
> URL: https://issues.apache.org/jira/browse/HIVE-17713
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Priority: Major
>
> This is kind of a followup from HIVE-11985
> When a SerDe uses an external schema (either embedded, or via a file link),
> it's not using the information stored in metastore for the columns. So, if
> the users modify table schema via add column and other such commands it won't
> have effect on the serde, since it's using the external schema to figure out
> what the columns are; leading to confusion and bugs. We should not allow such
> a modification for SerDes not in hive.serdes.using.metastore.for.schema
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