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Implement functionality for pre-filters and maxDistance threshold parameters #18459

@rahil-c

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@rahil-c

Task Description

What needs to be done:
Add the ability to pass a filter string in order to have our VECTOR search TVF filter out rows ahead of time before doing the distributed KNN computation. Also adding an optional maxDistance threshold (results beyond this distance are excluded before top-K, selection, reducing shuffle and sort volume)

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Code improvement/refactoring

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