How to get a spark sql statement implement duration ?

[Mars Xu]

Hello All,

        Some spark sqls will produce one or more jobs, I have 2 questions,
 
        1, How the cc.sql(“sql statement”) divided into one or more jobs ?
        2, When I execute spark sql query in spark - shell client, how to get 
the execution time (Spark  2.1.0) ?  if a sql query produced 3 jobs, In my 
opinion, the execution time is to sum up the 3 jobs’ duration time.

Thanks .

Mars
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