Patent Document ID: 8438153
Application ID: 12901934

Base Claim:
1. A method of performing a database join, comprising: receiving a query specifying a join of a first table and a second table; determining a new predicate for the query based on a bit map, for a plurality of tuples of the join, between a first column of the first table, and a second column of the second table; and modifying the query such that the query comprises the new predicate; generating the bit map, wherein generating the bit map comprises: determining a plurality of potential value pairs between the first column and the second column; determining a plurality of actual value pairs in a plurality of tuples resulting from the join query; and setting a bit in the bit map to 1 for each of the plurality of actual value pairs.

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Claim 2:
2. The method recited in claim 1 , comprising executing the modified query.