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...ter than (TEXT) and headers may be further split into with / without index. Larger sets could be more work to search than smaller ones. In general, an estimate of the number of comparisons could be a good metric for work to be done. 3. For AND compositions, start with the simplest one in the AND compostition, and continue with increasingly heavier ones. Apply later conditions only on the output of the previous conditions, either after collecting all of it or everytime something is found. Whatever is optimal -- bulk operations are more efficient, but may collect large sets to handle. 4. For OR compos...