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https://issues.apache.org/jira/browse/HIVE-26667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17631933#comment-17631933
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Sai Hemanth Gantasala commented on HIVE-26667:
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[~dengzh] - Thanks for the contribution. Fix merged to master.
> Incompatible expression deserialization against latest HMS
> ----------------------------------------------------------
>
> Key: HIVE-26667
> URL: https://issues.apache.org/jira/browse/HIVE-26667
> Project: Hive
> Issue Type: Bug
> Components: Standalone Metastore
> Affects Versions: 4.0.0-alpha-1
> Reporter: Zhihua Deng
> Assignee: Zhihua Deng
> Priority: Major
> Labels: pull-request-available
> Time Spent: 40m
> Remaining Estimate: 0h
>
> When an old Metastore client requests listPartitionsByExpr against the
> lastest HMS, an exception would be thrown:
>
> {noformat}
> MetaException(message:Unable to find class:
> )
> at
> org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$get_partitions_by_expr_result$get_partitions_by_expr_resultStandardScheme.read(ThriftHiveMetastore.java)
> at
> org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$get_partitions_by_expr_result$get_partitions_by_expr_resultStandardScheme.read(ThriftHiveMetastore.java)
> at
> org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$get_partitions_by_expr_result.read(ThriftHiveMetastore.java)
> at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:86)
> at
> org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$Client.recv_get_partitions_by_expr(ThriftHiveMetastore.java:3273)
> at
> org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$Client.get_partitions_by_expr(ThriftHiveMetastore.java:3260)
> at
> org.apache.hadoop.hive.metastore.HiveMetaStoreClient.listPartitionsByExpr(HiveMetaStoreClient.java:1488){noformat}
> This was caused by a gap between old client and server on (de)serializing the
> expression. Old client doesn't stream the expression’s class type into bytes,
> while HMS reads the class type from serialized bytes first, which makes the
> trouble. Other APIs that need to (de)serialize expression may be suffered as
> well.
>
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