xuyang created CALCITE-4916:
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             Summary: Need more exception information about "Non-query 
expression encountered in illegal context"
                 Key: CALCITE-4916
                 URL: https://issues.apache.org/jira/browse/CALCITE-4916
             Project: Calcite
          Issue Type: Improvement
            Reporter: xuyang


As a user, in most cases I was confused with the exception with "Non-query 
expression encountered in illegal context", and re-check my entire sql even if 
the sql is too long. I see some issues about this exception have been existed. 
The root cause is that the exception lacks some necessary information such asĀ  
position and expected sequences following. So, maybe the exception information 
can be improved to be more clear to users.



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