Further work on planning of indexscans. Cleaned up interfaces

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 49ed4dd77910f5993e5c4100bf0ca48f893a898e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 1999-07-25T23:07:26Z
Releases: 7.1.1
Further work on planning of indexscans.  Cleaned up interfaces
to index_selectivity so that it can be handed an indexqual clause list
rather than a bunch of assorted derivative data.

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