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feat: add metrics for allow list / block list size from query search - #9255

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westonpace wants to merge 1 commit into
lance-format:mainfrom
westonpace:feat/scalar-index-query-metrics
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westonpace wants to merge 1 commit into
lance-format:mainfrom
westonpace:feat/scalar-index-query-metrics

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The ScalarIndexQuery node always reports output_rows=2 because of the way we encode query results (compressed bitmaps) into arrow. This leaves output_rows alone but adds min_allowed, min_blocked, max_allowed, and max_blocked properties to the node. This will help us know how many rows a filtered read needed to actually read.

@github-actions github-actions Bot added the enhancement New feature or request label Sep 15, 2026
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