wangyum opened a new pull request #24715: [SPARK-25474][SQL] Data source tables 
support fallback to HDFS for size estimation
URL: https://github.com/apache/spark/pull/24715
 
 
   ## What changes were proposed in this pull request?
   
   Data source tables support fallback to HDFS for size estimation if table 
stats is empty.
   
   ## How was this patch tested?
   
   unit tests
   

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