hristo-stripe opened a new issue #8008:
URL: https://github.com/apache/pinot/issues/8008


   When I run the following query (replacing $number with a numerical value):
   ```sql
   explain plan for select count(*) from t where col1=true and col2 >= $number 
limit 10
   ```
   
   I get results that don't show much:
   ```json
       "rows": [
         [
           "BROKER_REDUCE(limit:10)",
           0,
           -1
         ],
         [
           0
         ]
       ]
   ```
   
   The query itself produces a count successfully, however the explain plan 
doesn't work at all.
   
   If I try
   ```sql
   explain plan for select * from t where col1=true and col2 >= $number limit 10
   ```
   it crashes and I get the exception:
   ```
   ProcessingException(errorCode:450, message:InternalError:
   java.io.IOException: Failed : HTTP error code : 500
        at 
org.apache.pinot.controller.api.resources.PinotQueryResource.sendPostRaw(PinotQueryResource.java:305)
        at 
org.apache.pinot.controller.api.resources.PinotQueryResource.sendRequestRaw(PinotQueryResource.java:343)
        at 
org.apache.pinot.controller.api.resources.PinotQueryResource.getQueryResponse(PinotQueryResource.java:225)
        at 
org.apache.pinot.controller.api.resources.PinotQueryResource.handlePostSql(PinotQueryResource.java:137))
   ```
   
   cc @amrishlal since it looks like you built most of that functionality.


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