An information retrieval system using index anding for...

Details An information retrieval system using index anding for... An information retrieval system using index anding for...

G - Physics

06

F

G06F 17/30 (2006.01)

Patent

CA 2427273

For an information retrieval system adapted to process a query having an associated plan, the associated plan includes applying predicates, including local predicates and a join predicate, to at least two tables, method and system of applying the predicates is provided. Index ANDing is used to construct a filter for filtering a first of the tables in accordance with the local predicates. The join predicate is applied to the tables for determining row identifiers of rows satisfying the join predicate. The row identifiers are used to probe the filter for determining whether the rows satisfying the join predicate also satisfy the local predicates. The rows that satisfy both the join and local predicates are fetched and the join predicate is completed. Results of the join predicate are then returned.

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