carsonwang commented on issue #20303: [SPARK-23128][SQL] A new approach to do 
adaptive execution in Spark SQL
URL: https://github.com/apache/spark/pull/20303#issuecomment-475522814
 
 
   @justinuang , sorry for late reply. For `df.repartition(500)`, AE does use 
the specified number for repartition. That is, each stage will writes the map 
output with 500 partitions. However, in the following up stage, AE may launch 
tasks less than 500 as one task can process multiple continues blocks.

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