[jira] [Updated] (HIVE-2941) Hive should expand nested structs when setting the table schema from thrift structs

["Travis Crawford (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-2941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Travis Crawford updated HIVE-2941:
----------------------------------

    Attachment: HIVE-2941.D3513.1.patch
    
> Hive should expand nested structs when setting the table schema from thrift structs
> -----------------------------------------------------------------------------------
>
>                 Key: HIVE-2941
>                 URL: https://issues.apache.org/jira/browse/HIVE-2941
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Travis Crawford
>            Assignee: Travis Crawford
>         Attachments: HIVE-2941.D2721.1.patch, HIVE-2941.D3513.1.patch
>
>
> When setting a table serde, the deserializer is queried for its schema, which is used to set the metastore table schema. The current implementation uses the class name stored in the field as the field type.
> By storing the class name as the field type, users cannot see the contents of a struct with "describe tblname". Applications that query HiveMetaStore for the table schema (specifically HCatalog in this case) see an unknown field type, rather than a struct containing known field types.
> Hive should store the expanded schema in the metastore so users browsing the schema see expanded fields, and applications querying metastore see familiar types.
> DETAILS
> Set the table serde to something like this. This serde uses the built-in {{ThriftStructObjectInspector}}.
> {code}
> alter table foo_test
>   set serde "com.twitter.elephantbird.hive.serde.ThriftSerDe"
>   with serdeproperties ("serialization.class"="com.foo.Foo");
> {code}
> This causes a call to {{MetaStoreUtils.getFieldsFromDeserializer}} which returns a list of fields and their schemas. However, currently it does not handle nested structs, and if {{com.foo.Foo}} above contains a field {{com.foo.Bar}}, the class name {{com.foo.Bar}} would appear as the field type. Instead, nested structs should be expanded.

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