orhankislal opened a new pull request #573:
URL: https://github.com/apache/madlib/pull/573


   WCC had a high number of plpy.execute commands. Since each call
   creates a new subtransaction, it was constantly hitting the
   overflow limit. This commit merges most of them.
   
   WCC also created and dropped temp tables in each iteration.
   This bloats the catalog, so this commit uses a few actual
   tables and uses truncate/insert.
   
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