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