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https://issues.apache.org/jira/browse/CALCITE-2530?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hongze Zhang updated CALCITE-2530:
----------------------------------
    Description: 
Calcite's TRIM function takes the first character of <trim character> string to 
trim the <trim source>, whereas SQL standard suggests to report a "trim error" 
when the length of <trim character> is not 1.

I am not sure if this could be treated as an issue(since the calcite's way 
might has better availability), until I found this:

https://issues.apache.org/jira/browse/BEAM-4704

It seems user could be sometimes confused with the behavior of TRIM function in 
Calcite.

  was:
Calcite's TRIM function takes the first character of <trim character> string to 
trim the <trim source>, whereas SQL standard suggests to report a "trim error" 
when the length of <trim character> is not 1.

I am not sure if this could be treated as an issue(since the calcite's way 
might has better availability), until I found this:

[https://issues.apache.org/jira/browse/BEAM-4704|https://issues.apache.org/jira/browse/BEAM-4704]

It seems user could be sometimes confused with the behavior of TRIM function.


> Reasonable behavior of TRIM function when the length of trim character is not 
> 1(one)
> ------------------------------------------------------------------------------------
>
>                 Key: CALCITE-2530
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2530
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Hongze Zhang
>            Assignee: Julian Hyde
>            Priority: Minor
>
> Calcite's TRIM function takes the first character of <trim character> string 
> to trim the <trim source>, whereas SQL standard suggests to report a "trim 
> error" when the length of <trim character> is not 1.
> I am not sure if this could be treated as an issue(since the calcite's way 
> might has better availability), until I found this:
> https://issues.apache.org/jira/browse/BEAM-4704
> It seems user could be sometimes confused with the behavior of TRIM function 
> in Calcite.



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