I find it frustrating when you ask “are there plans to…”. Calcite is a 
volunteer project. I don’t know what other contributors are doing, and I don’t 
control their time. If someone is working on something, they will have logged a 
JIRA case and marked it “in progress” or set the “fix version” field. If you 
had done a search, you would have found a JIRA case [1]; it has been inactive 
for 2 years.

If you really want this function, contribute a patch.


[1] https://issues.apache.org/jira/browse/CALCITE-420 

> On Sep 17, 2016, at 5:49 AM, hongbin ma <mahong...@apache.org> wrote:
> hi experts
> recently we need to enable "replace" function for our customer, like
> replacing all the X with Y in "123X456X". According to
> https://calcite.apache.org/docs/reference.html the replace function seems
> not implemented. I see there's another function called "OVERLAY", however
> it's replacing with "index" instead of a "pattern".
> Is there any plans to support replace function? Do I have to implement a
> UDF by myself now?​
> -- 
> Regards,
> *Bin Mahone | 马洪宾*

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