Hi, Spark is very efficeint in SQL because of https://databricks.com/blog/2015/04/28/project-tungsten-bringing-spark-closer-to-bare-metal.html <https://databricks.com/blog/2015/04/28/project-tungsten-bringing-spark-closer-to-bare-metal.html> you can see all the metrics of your all the transformation in sparkUI. If you are running the spark in localhost then hit lhttp://localhost:4040 on this there is SQL tab please go through it
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