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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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4
src/backend/optimizer/path/indxpath.c
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@ -1075,10 +1075,10 @@ check_index_only(RelOptInfo *rel, IndexOptInfo *index)
ListCell *lc;
int i;
/* Index-only scans must be enabled, and AM must be capable of it */
/* Index-only scans must be enabled, and index must be capable of them */
if (!enable_indexonlyscan)
return false;
if (!index->amcanreturn)
if (!index->canreturn)
return false;
/*