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Hive >> mail # dev >> Hive common join Vs. JoinLineage

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Hive common join Vs. JoinLineage

As far as I know, a join operation can be converted to a common join at the
physical optimization stage, if the correspondent variable is set to true .
If not, join will be performed by JoinLineage, am I right? What is exactly
the difference between these two approaches?

I appreciate your help in advance.