Optimal Joins

[jhellerstein]

Going to implement algorithms from Wang/Willsey's Freejoin paper, and extend to binary optimal joins along the lines of Olteanu's factorized research.

Breaking it down:

• Generalized Hash Trie data structure Generalized Hash Trie #1249
• Generic Join
• COLT
• Freejoin (maybe)
• Shared factorization
• New binary join algorithm(s)