To overcome the limitations in the prior art described above, and to overcome other limitations that will become apparent upon reading and understanding the present specification, the present invention discloses a method, apparatus, article of manufacture, and {HEAD ~ data structure} related to {TAIL ~ the maintenance} of a plurality of join indexes 
related to
To overcome the limitations in the prior art described above , and to overcome other limitations that will become apparent upon reading and understanding the present specification , the present invention discloses a method , apparatus , article of manufacture , and { HEAD ~ data structure } related to { TAIL ~ the maintenance } of a plurality of join indexes
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