kaknikhil opened a new pull request #491:  DL: Fix disk issue by using truncate 
guc 
URL: https://github.com/apache/madlib/pull/491
 
 
   While testing places10 with fit multiple (gpdb5 and gpdb6, 10 iterations and 
20 msts), we ran out of disk space although we had at least 1.5T left at the 
beginning of the query.
   
   Fixed this by using a gpdb (> 6.4) only guc that allows for releasing disk 
space inside a sub transaction by calling truncate (see commit message for more 
details)
   
   Other changes (see individual commit for more details)
   1. Utilities: Improve rename table logic 
   1. Graph: Add select statements to graph tests 
   1. DL: add tests for asserting that guc values are unchanged 
   
   
   JIRA: MADLIB-1406
   
   - [ ] Add the module name, JIRA# to PR/commit and description.
   - [ ] Add tests for the change. 
   
   

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