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https://issues.apache.org/jira/browse/HIVE-21489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17379963#comment-17379963
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Panagiotis Garefalakis commented on HIVE-21489:
-----------------------------------------------
Resolved via https://github.com/apache/hive/pull/2373
Thanks [~rameshkumar] for the patch!
> 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 20m
> 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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