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https://issues.apache.org/jira/browse/CALCITE-4916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17452567#comment-17452567
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Julian Hyde commented on CALCITE-4916:
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What are the existing issues? Please link to them.
I agree that this message is not very helpful. Can you come up with a few
example queries that produce this message? Then perhaps we can craft something
better. Possibly even split into different messages for different scenarios.
> 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
> Priority: Major
>
> 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 as position and expected sequences following. So, maybe the
> exception information can be improved to be more clear to users.
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