Dynamic programming strikes back

@inproceedings{Moerkotte2008DynamicPS,
  title={Dynamic programming strikes back},
  author={Guido Moerkotte and Thomas Neumann},
  booktitle={SIGMOD Conference},
  year={2008}
}
Two highly efficient algorithms are known for optimally ordering joins while avoiding cross products: DPccp, which is based on dynamic programming, and Top-Down Partition Search, based on memoization. Both have two severe limitations: They handle only (1) simple (binary) join predicates and (2) inner joins. However, real queries may contain complex join predicates, involving more than two relations, and outer joins as well as other non-inner joins. Taking the most efficient known join-ordering… CONTINUE READING
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