edrevo opened a new pull request #535:
URL: https://github.com/apache/arrow-datafusion/pull/535


   # Which issue does this PR close?
   
   Closes #534.
   
    # Rationale for this change
   The collect implementation in BallistaContext is bringing all of the 
contents in memory even though there is no need for it.
   
   # What changes are included in this PR?
   Collect will now use streams all the way to avoid hogging memory
   
   # Are there any user-facing changes?
   No


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