[HIVE-21489] EXPLAIN command throws ClassCastException in Hive

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.3.4, 3.1.2
• Fix Version/s: 3.1.3, 4.0.0-alpha-1
• Labels: pull-request-available
• Assignee: Ramesh Kumar Thangarajan
• Reporter: Ping Lu
• Due: 22/Mar/19
• Created: 22/Mar/19 09:27
• Updated: 21/Oct/22 06:56
• Resolved: 13/Jul/21 15:19

Description

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,

Issue Links

• links to: GitHub Pull Request #2373