orhankislal commented on issue #441: Kmeans: simplified silhouette per point 
for k-means
URL: https://github.com/apache/madlib/pull/441#issuecomment-531964034
 
 
   Regarding point 3:
   Unfortunately, gpdb has a limitation: a function cannot execute on segment 
if it accesses a relation. Here is a bit more detail: 
https://community.pivotal.io/s/article/Function-cannot-Execute-on-the-Segment-Node-in-Pivotal-Greenplum
   
   We can try to work around it but it would involve some significant 
refactoring. Alternatively, you can create a view with a single row (using 
select * from <table> where k = <target_k>) and use it as input.

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