1.co varient in scala
2.Upper and lower bound class parameters
3.md5 function in scala
4.if list is empty,supposed if we use reduce function, how does it work
5.1 file has 100 gb,another 1 file has 10 gb, both dataset are going to join,how to make better optimization in spark'
6.map and flat map
2.Upper and lower bound class parameters
3.md5 function in scala
4.if list is empty,supposed if we use reduce function, how does it work
5.1 file has 100 gb,another 1 file has 10 gb, both dataset are going to join,how to make better optimization in spark'
6.map and flat map
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