GXM2333 opened a new issue #8275:
URL: https://github.com/apache/pinot/issues/8275


   I download `apache-pinot-0.9.3-bin.tar.gz` from [pinot official 
website](https://pinot.apache.org/download/) and set up a cluster using this 
[guide,](https://docs.pinot.apache.org/developers/advanced/advanced-pinot-setup)
 . My machine OS is `CentOS Linux release 7.4.1708 (Core)`. I want to check 
whether sqls use indexes, etc. But I got an error like this:
   
   
![](https://user-images.githubusercontent.com/24871202/156322457-12457212-ba6c-4d3b-91f5-735bfe320116.png)
   
   And from the broker instance log, I only got this log:
   
   ```
   Caught exception while compiling SQL request 10: EXPLAIN PLAN FOR  select 
count(*) from transcript_benchmark limit 10, class 
org.apache.calcite.sql.SqlExplain cannot be cast to class 
org.apache.calcite.sql.SqlSelect (org.apache.calcite.sql.SqlExplain and 
org.apache.calcite.sql.SqlSelect are in unnamed module of loader 'app')
   ```
   It seems like pinot uses calcite do sql parser, I don't know why it doesn't 
work. Could you help me?  
   


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