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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