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pg: Rewrite _origin_query to force the query planner to filter on URLs before filtering on visits.

vlorentz requested to merge generated-differential-D3662-source into generated-differential-D3662-target

URL filters usually have a few matches and use the index; whereas filtering on visits requires to scan the entire origin table first.

This makes the query considerably faster.

Credit for the idea goes to @olasd.

Migrated from D3662 (view on Phabricator)

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