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Replace simple constant pg_am.amcanreturn with an AM support function.

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The need for this was debated when we put in the index-only-scan feature,
but at the time we had no near-term expectation of having AMs that could
support such scans for only some indexes; so we kept it simple.  However,
the SP-GiST AM forces the issue, so let's fix it.

This patch only installs the new API; no behavior actually changes.
This commit is contained in:
Tom Lane
2011-12-18 15:49:00 -05:00
parent 19d2231718
commit 3695a55513
15 changed files with 103 additions and 46 deletions
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src/include/access/spgist.h
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@@ -182,6 +182,7 @@ extern Datum spgmarkpos(PG_FUNCTION_ARGS);
extern Datum spgrestrpos(PG_FUNCTION_ARGS);
extern Datum spggetbitmap(PG_FUNCTION_ARGS);
extern Datum spggettuple(PG_FUNCTION_ARGS);
extern Datum spgcanreturn(PG_FUNCTION_ARGS);
/* spgutils.c */
extern Datum spgoptions(PG_FUNCTION_ARGS);