[GitHub] [arrow-datafusion] matthewmturner opened a new pull request #2143: Add IF NOT EXISTS to CREATE EXTERNAL TABLE

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matthewmturner opened a new pull request #2143:
URL: https://github.com/apache/arrow-datafusion/pull/2143


   # Which issue does this PR close?
   
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   Task 14 of #1777 
   
    # Rationale for this change
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