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, {TAIL ~ the present invention} discloses a method, apparatus, article of {HEAD ~ manufacture}, and data structure related to the maintenance of a plurality of join indexes 
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 , { TAIL ~ the present invention } discloses a method , apparatus , article of { HEAD ~ manufacture } , and data structure related to the maintenance of a plurality of join indexes
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