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Commit32e8fc4

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Arrange to cache fmgr lookup information for an index's access method
routines in the index's relcache entry, instead of doing a fresh fmgr_infoon every index access. We were already doing this for the index's opclasssupport functions; not sure why we didn't think to do it for the AMfunctions too. This supersedes the former method of caching (only)amgettuple in indexscan scan descriptors; it's an improvement because thefunction lookup can be amortized across multiple statements instead ofbeing repeated for each statement. Even though lookup for builtinfunctions is pretty cheap, this seems to drop a percent or two off somesimple benchmarks.
1 parentdd67cf3 commit32e8fc4

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6 files changed

+118
-96
lines changed

6 files changed

+118
-96
lines changed

‎src/backend/access/index/genam.c‎

Lines changed: 2 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/access/index/genam.c,v 1.47 2005/04/14 20:03:23 tgl Exp $
11+
* $PostgreSQL: pgsql/src/backend/access/index/genam.c,v 1.48 2005/05/27 23:31:20 tgl Exp $
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*
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* NOTES
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* many of the old access method routines have been turned into
@@ -86,6 +86,7 @@ RelationGetIndexScan(Relation indexRelation,
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else
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scan->keyData=NULL;
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89+
scan->is_multiscan= false;/* caller may change this */
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scan->kill_prior_tuple= false;
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scan->ignore_killed_tuples= true;/* default setting */
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scan->keys_are_unique= false;/* may be set by index AM */
@@ -101,10 +102,6 @@ RelationGetIndexScan(Relation indexRelation,
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scan->xs_ctup.t_data=NULL;
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scan->xs_cbuf=InvalidBuffer;
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/* mark cached function lookup data invalid; it will be set later */
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scan->fn_getnext.fn_oid=InvalidOid;
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scan->fn_getmulti.fn_oid=InvalidOid;
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scan->unique_tuple_pos=0;
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scan->unique_tuple_mark=0;
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