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Doc: rework introductory documentation about covering indexes.
Documenting INCLUDE in the section about unique indexes is confusing,as complained of by Emilio Platzer. Furthermore, it entirely failedto explain why you might want to use the feature. The section aboutindex-only scans is really the right place; it already talked aboutmaking such things the hard way. Rewrite that text to describe INCLUDEas the normal way to make a covering index.Also, move that section up a couple of places, as it now seems moreimportant than some of the stuff we had before it. It still has tobe after expression and partial indexes, since otherwise some of itwould involve forward references.Discussion:https://postgr.es/m/154031939560.30897.14677735588262722042@wrigleys.postgresql.org1 parent25c026c commitfe375d3
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