Spark SQL: Relational Data Processing in Spark SIGMOD’15
IntroductionBigdataapplicationsrequireamixofprocessingtechniques,data sourcesandstorageformats.Theearliestsystemsdesignedfor theseworkloads,suchasMapReduce,gaveusersapowerful,but low-level,proceduralprogramminginterface.Prog