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https://issues.apache.org/jira/browse/HIVE-21489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Panagiotis Garefalakis updated HIVE-21489:
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    Fix Version/s: 4.0.0
                   3.1.3

> EXPLAIN command throws ClassCastException in Hive
> -------------------------------------------------
>
>                 Key: HIVE-21489
>                 URL: https://issues.apache.org/jira/browse/HIVE-21489
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 2.3.4, 3.1.2
>            Reporter: Ping Lu
>            Assignee: Ramesh Kumar Thangarajan
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.1.3, 4.0.0
>
>         Attachments: HIVE-21489.1.patch, HIVE-21489.2.patch
>
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> I'm trying to run commands like explain select * from src in hive-2.3.4,but 
> it falls with the ClassCastException: 
> org.apache.hadoop.hive.ql.parse.ExplainSemanticAnalyzer cannot be cast to 
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer
> Steps to reproduce:
> 1)hive.execution.engine is the default value mr
> 2)hive.security.authorization.enabled is set to true, and 
> hive.security.authorization.manager is set to 
> org.apache.hadoop.hive.ql.security.authorization.DefaultHiveAuthorizationProvider
> 3)start hivecli to run command:explain select * from src
> I debug the code and find the issue HIVE-18778 causing the above 
> ClassCastException.If I set hive.in.test to true,the explain command can be 
> successfully executed。
> Now,I have one question,due to hive.in.test cann't be modified at runtime.how 
> to run explain command with using default authorization in hive-2.3.4,



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