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Speeding up heterogeneous data access by converting and pushing down string comparisons

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2 Author(s)
Zhang, W. ; Microsoft Corp., Redmond, WA, USA ; Larson, P.-A.

Pushing down predicates to an external data source is critical to the performance for querying heterogeneous data sources. However, predicate-containing string comparisons cannot be pushed down unchanged if the external data source uses a different collating sequence. We describe a table-driven technique for rewriting such predicates to account for the differences in collation. In addition to precise conversion, we also consider imprecise conversion

Published in:

Data Engineering, 1999. Proceedings., 15th International Conference on

Date of Conference:

23-26 Mar 1999