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Commite20c70c

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Allow skipping some items in a multi-key GIN search.
In a multi-key search, ie. something like "col @> 'foo' AND col @> 'bar'",as soon as we find the next item that matches the first criteria, we don'tneed to check the second criteria for TIDs smaller the first match. Thatsaves a lot of effort, especially if one of the terms is rare, while thesecond occurs very frequently.Based on ideas from Alexander Korotkov's fast scan patch.
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