title: What is the difference between spark.sql.shuffle.partitions and spark.default.parallelism?
body: <p>What's the difference between <code>spark.sql.shuffle.partitions</code> and <code>spark.default.parallelism</code>?</p>
  
  <p>I have tried to set both of them in <code>SparkSQL</code>, but the task number of the second stage is always 200.</p>