19
19
* of lossiness. In theory we could fall back to page ranges at some
20
20
* point, but for now that seems useless complexity.
23
23
* means we know that a search need visit only some tuples on a page,
24
24
* but we are not certain that all of those tuples are real matches.
25
25
* So the eventual heap scan must recheck the quals for these tuples only,