35. Join Strategy in Spark with Demo 

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Join Selection strategy
Spark decides what algorithm will be used for joining the data in the phase of physical planning, where each node in the logical plan has to be converted to one or more operators in the physical plan using so-called strategies. The strategy responsible for planning the join is called Join Selection.
Broadcast Hash Join
Shuffle Hash Join
Shuffle Sort Merge Join
Cartesian Join
Broadcasted Nested Loop Join
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