[jira] [Created] (HIVE-19040) get_partitions_by_expr() implementation in HiveMetaStore causes backward incompatibility easily

["Aihua Xu (JIRA)" <ji...@apache.org>]

Aihua Xu created HIVE-19040:
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             Summary: get_partitions_by_expr() implementation  in HiveMetaStore causes backward incompatibility easily
                 Key: HIVE-19040
                 URL: https://issues.apache.org/jira/browse/HIVE-19040
             Project: Hive
          Issue Type: Improvement
          Components: Standalone Metastore
    Affects Versions: 2.0.0
            Reporter: Aihua Xu


In the HiveMetaStore implementation of {{public PartitionsByExprResult get_partitions_by_expr(PartitionsByExprRequest req) throws TException}} , an expression is serialized into byte array from the client side and passed through  PartitionsByExprRequest. Then HMS will deserialize back into the expression and filter the partitions by it.

Such partition filtering expression can contain various UDFs. If there are some changes to one of the UDFs between different Hive versions, HS2 on the older version will serialize the expression in old format which won't be able to be deserialized by HMS on the newer version.  One example of that is, GenericUDFIn class adds {{transient}}  to the field constantInSet which will cause such incompatibility.

One approach I'm thinking is, instead of converting the expression object to byte array, we can pass the expression string directly. 

 

 

  

 

 



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