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https://issues.apache.org/jira/browse/CALCITE-1375?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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hongbin ma resolved CALCITE-1375.
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    Resolution: Not A Problem

> Why "select CONCAT('a','b') from EMPS" won't work?
> --------------------------------------------------
>
>                 Key: CALCITE-1375
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1375
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: hongbin ma
>            Assignee: Julian Hyde
>
> Hi experts,
> I have some confusing observations:
> || query || result ||
> | select QUARTER(DATE'2010-01-02') from EMPS; | OK |
> | select {fn QUARTER(DATE'2010-01-02')} from EMPS; | OK|
> |select {fn CONCAT('a','b')} from EMPS; | OK|
> |select CONCAT('a','b') from EMPS; |FAIL|
> The error message is : 
> Error: Error while executing SQL "select CONCAT('a','b') from EMPS": From 
> line 1, column 8 to line 1, column 22: No match found for function signature 
> CONCAT(<CHARACTER>, <CHARACTER>) (state=,code=0)
> why is CONCAT without function escape failing? is there any reasons behind 
> this? 
> There're many JDBC escape functions in 
> https://calcite.apache.org/docs/reference.html, is there a way to tell which 
> can run without the "{fn" prefix? 
> I'm using calcite 1.8.0's sqlline under example/csv 
> thanks!



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