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Add SQL-accessible functions for inspecting index AM properties.
Per discussion, we should provide such functions to replace the lost ability to discover AM properties by inspecting pg_am (cf commit65c5fcd35
). The added functionality is also meant to displace any code that was looking directly at pg_index.indoption, since we'd rather not believe that the bit meanings in that field are part of any client API contract. As future-proofing, define the SQL API to not assume that properties that are currently AM-wide or index-wide will remain so unless they logically must be; instead, expose them only when inquiring about a specific index or even specific index column. Also provide the ability for an index AM to override the behavior. In passing, document pg_am.amtype, overlooked in commit473b93287
. Andrew Gierth, with kibitzing by me and others Discussion: <87mvl5on7n.fsf@news-spur.riddles.org.uk>
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@ -79,6 +79,7 @@ gisthandler(PG_FUNCTION_ARGS)
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amroutine->amcanreturn = gistcanreturn;
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amroutine->amcostestimate = gistcostestimate;
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amroutine->amoptions = gistoptions;
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amroutine->amproperty = gistproperty;
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amroutine->amvalidate = gistvalidate;
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amroutine->ambeginscan = gistbeginscan;
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amroutine->amrescan = gistrescan;
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