[GitHub] [arrow-datafusion] matthewmturner opened a new issue #1871: CREATE EXTERNAL TABLE sql should check if table exists before doing IO

[GitBox <gi...@apache.org>]

matthewmturner opened a new issue #1871:
URL: https://github.com/apache/arrow-datafusion/issues/1871


   **Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
   A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] 
   (This section helps Arrow developers understand the context and *why* for this feature, in addition to  the *what*)
   I was using datafusion-cli to test some sql queries on a large csv (for db-benchmark).  It takes a while for the table to be created as it is a large csv.  I ran the `CREATE EXTERNAL TABLE` command twice in the same session and got the error `Execution("The table x already exists")`.  However i had to wait the full time for IO to complete before the error showed up which i think is a waste of time.  I believe this is because we are running IO before checking if table exists.
   
   **Describe the solution you'd like**
   A clear and concise description of what you want to happen.
   We should check if a table exists before doing IO and raise the table already exists error if it already exists.
   
   **Describe alternatives you've considered**
   A clear and concise description of any alternative solutions or features you've considered.
   
   **Additional context**
   Add any other context or screenshots about the feature request here.
   


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