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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;
/*

2
src/backend/optimizer/util/plancat.c
View File

@ -212,8 +212,8 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
info->relam = indexRelation->rd_rel->relam;
info->amcostestimate = indexRelation->rd_am->amcostestimate;
info->canreturn = index_can_return(indexRelation);
info->amcanorderbyop = indexRelation->rd_am->amcanorderbyop;
info->amcanreturn = indexRelation->rd_am->amcanreturn;
info->amoptionalkey = indexRelation->rd_am->amoptionalkey;
info->amsearcharray = indexRelation->rd_am->amsearcharray;
info->amsearchnulls = indexRelation->rd_am->amsearchnulls;