When will be the stats based join selector be implemented?

[Li Gao]

Hi all,

I am currently looking into getting optimized joins based on table stats. I
noticed in the QueryCompile at line 232-234 is still saying "TODO".

https://github.com/apache/phoenix/blob/4.x-HBase-1.0/phoenix-core/src/main/java/org/apache/phoenix/compile/QueryCompiler.java

We have a need to get the selector enabled based on the size of the the LHS
and RHS table.

Thanks,
Li