Yes, when eigenbase.org <http://eigenbase.org/> shut down I copied the contents 
of the wiki onto my server, http://www.hydromatic.net/wiki. 
http://www.hydromatic.net/wiki/Eigenbase_Introduction is a good place to start 
reading.

Maybe there’s a better place to store those files for posterity. I have just 
checked the files into git; see my fork of LucidDB: 
https://github.com/julianhyde/luciddb/commits/master. I’m trying to figure out 
how to make those files appear via GitHub pages.

Julian


> On Aug 16, 2023, at 6:54 AM, Michael Mior <[email protected]> wrote:
> 
> Thanks for pointing this out! It looks like Julian might have a mirror of
> that page at the link below that could be swapped out. Unfortunately, with
> the original page unavailable, I can't confirm.
> 
> http://www.hydromatic.net/wiki/RelationalExpressionMetadata
> 
> --
> Michael Mior
> [email protected]
> 
> 
> On Wed, Aug 16, 2023 at 9:30 AM Hongyu Guo <[email protected]> wrote:
> 
>> Hello,
>> 
>> I found a link in RelMetadataProvider.java has expired.
>> 
>> The link is http://wiki.eigenbase.org/RelationalExpressionMetadata
>> 
>> Found in
>> 
>> https://github.com/apache/calcite/blob/main/core/src/main/java/org/apache/calcite/rel/metadata/RelMetadataProvider.java
>> 
>> 
>> 
>> Best,
>> 
>> Hongyu Guo
>> 

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