WeichenXu123 opened a new pull request #24830: [SPARK-27990][SQL][ML][WIP] 
Provide a way to recursively load data from datasource
URL: https://github.com/apache/spark/pull/24830
 
 
   ## What changes were proposed in this pull request?
   
   Provide a way to recursively load data from datasource.
   I add a "recursive" option.
   
   When "recursive" option turn on, then partition inferring is turned off and 
all files from the directory will be loaded recursively.
   
   If some datasource explicitly specify the partitionSpec, then if user turn 
on "recursive" option, then exception will be thrown.
   
   ## How was this patch tested?
   
   To be added. This is a version for first review.
   
   Please review https://spark.apache.org/contributing.html before opening a 
pull request.
   

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