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https://issues.apache.org/jira/browse/HIVE-21414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16953762#comment-16953762
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David Mollitor commented on HIVE-21414:
---------------------------------------
{code:java}
if (hasMetastoreBasedSchema(SessionState.getSessionConf(), serializationLib)) {
return tTable.getSd().getCols();
}
...
public static boolean hasMetastoreBasedSchema(HiveConf conf, String serdeLib) {
return StringUtils.isEmpty(serdeLib) ||
conf.getStringCollection(ConfVars.SERDESUSINGMETASTOREFORSCHEMA.varname).contains(serdeLib);
}
{code}
Get the schema from the database (including comments) if the
{{serializationLib}} is in the list of {{SERDESUSINGMETASTOREFORSCHEMA}}...
which is marked deprecated...
{{SERDES_USING_METASTORE_FOR_SCHEMA}} is the new one and is where I added the
JSON SerDe to.
I think it should stay there and another patch should remove the deprecated
configuration.
> Hive JSON SerDe Does Not Properly Handle Field Comments
> -------------------------------------------------------
>
> Key: HIVE-21414
> URL: https://issues.apache.org/jira/browse/HIVE-21414
> Project: Hive
> Issue Type: Improvement
> Components: Serializers/Deserializers
> Affects Versions: 4.0.0, 3.2.0
> Reporter: David Mollitor
> Assignee: David Mollitor
> Priority: Minor
> Attachments: HIVE-21414.1.patch, HIVE-21414.1.patch
>
>
> Field comments are handed to the JSON SerDe from HMS and then are ignored.
> The result is that all field comments are 'from deserializer' and cannot be
> changed.
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