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https://issues.apache.org/jira/browse/HIVE-22669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ouchengeng updated HIVE-22669:
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Description:
For `desc table ` queries, DescTableOperation always creates a Deserializer
object, even though it's not often needed.
What is worse is that if a table is backed on some particular SerDe class, uses
have no chance to desc table without adding appropriate jar files. With this
patch, users at least are able to desc tables when they only need metadata of
the table, especially in an open Hive environment.
For above two reasons, it's better to create Deserializer object when it's
needed.
was:
For `desc table ` queries, DescTableOperation always creates a Deserializer
object, even though it's not often needed.
What is worse is that if a table is backed on some particular SerDe class, uses
have no chance to `desc table` without adding that jar file. With this patch,
users at least are able to desc tables when they only need metadata of the
table, especially in an open Hive environment.
For above two reasons, it's better to create Deserializer object when it's
needed.
> Do not initiate Deserializer for DescTable operation when it's not needed
> -------------------------------------------------------------------------
>
> Key: HIVE-22669
> URL: https://issues.apache.org/jira/browse/HIVE-22669
> Project: Hive
> Issue Type: Improvement
> Components: Clients, Hive
> Affects Versions: 3.0.0
> Reporter: ouchengeng
> Assignee: ouchengeng
> Priority: Major
>
> For `desc table ` queries, DescTableOperation always creates a Deserializer
> object, even though it's not often needed.
> What is worse is that if a table is backed on some particular SerDe class,
> uses have no chance to desc table without adding appropriate jar files. With
> this patch, users at least are able to desc tables when they only need
> metadata of the table, especially in an open Hive environment.
> For above two reasons, it's better to create Deserializer object when it's
> needed.
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