[GitHub] [spark] AngersZhuuuu opened a new pull request #25290: [SPARK-28551][SQL]Add a Checker Rule when CTAS SQL with LOCATION

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AngersZhuuuu opened a new pull request #25290: [SPARK-28551][SQL]Add a Checker Rule when CTAS SQL with LOCATION 
URL: https://github.com/apache/spark/pull/25290
 
 
   ## What changes were proposed in this pull request?
   
   When we run SQL like 
   
   `CRETE TABLE TBL `
   `LOCATION 'PATH_URI`
   `AS`
   `SELECT QUERY `
   It won't check PATH_URI status, if there is some data under this path, it will just overwrite this path.
   
   If user careless write a path with important data store under the path, it will be a disaster。 
   
   So I wish to add a checker rule in PreWriteChecker to avoid this situation happens
   
   ## How was this patch tested?
   UT & MT
   

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