my-vegetable-has-exploded commented on issue #318:
URL: 
https://github.com/apache/arrow-datafusion/issues/318#issuecomment-1872663894

   > There is a blog post about this from duckdbL 
https://duckdb.org/2022/05/27/iejoin.htmlduckdbL 有一篇关于此的博客文章 
https://duckdb.org/2022/05/27/iejoin.html
   
   We can treat asof join as a special kind of iejoin of course. Furthermore 
AsOf can stop searching when it finds the first match because there is at most 
one match.This leaves us room for optimization.  I think it's ok to support 
asofjoin without iejoin (which can be done later).  Here is another blog about 
AsOf join https://duckdb.org/2023/09/15/asof-joins-fuzzy-temporal-lookups.
   
   I am willing to have a try this if nobody is working on this.
   


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