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https://issues.apache.org/jira/browse/CALCITE-2846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16806346#comment-16806346
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Hongze Zhang commented on CALCITE-2846:
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I see this issue has been mentioned in CALCITE-2965 as likely a blocker. But 
unfortunately I am not currently working on this so I have unassigned myself 
from the issue. If would be much appreciated if someone decide to help then.

> Document Oracle-specific functions, such as NVL and LTRIM, in the SQL 
> reference
> -------------------------------------------------------------------------------
>
>                 Key: CALCITE-2846
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2846
>             Project: Calcite
>          Issue Type: Improvement
>          Components: site
>            Reporter: Julian Hyde
>            Assignee: Hongze Zhang
>            Priority: Major
>              Labels: documentation
>
> Document Oracle-specific functions (DECODE, NVL, LTRIM, RTRIM, SUBSTR, 
> GREATEST, LEAST) in the [SQL 
> reference|https://calcite.apache.org/docs/reference.html].
> Same goes for MySQL-specific functions (e.g. JSON_TYPE).
> I don't think we should have separate lists of Oracle-specific functions and 
> MySQL-specific functions. Because quite a few functions appear in more than 
> one place. Better, I think, to have a concise annotation against each 
> function which tables it occurs in.
> The current list of tables is standard, oracle, spatial, mysql. Perhaps also 
> indicate whether a function is an extension to the SQL standard but still 
> occurs in Calcite's default table.



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