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Add missing optimizer hooks for function cost and number of rows. 

Closely follow design of other optimizer hooks: if hook exists
retrieve value from plugin; if still not set then get from cache.
This commit is contained in:
Simon Riggs 2010-04-23 22:23:39 +00:00
parent 491d1ea5b3
commit 473af39737
2 changed files with 23 additions and 2 deletions
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17
src/backend/utils/cache/lsyscache.c vendored
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/lsyscache.c,v 1.168 2010/02/26 02:01:11 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/cache/lsyscache.c,v 1.169 2010/04/23 22:23:39 sriggs Exp $
*
* NOTES
* Eventually, the index information should go through here, too.
@ -38,6 +38,9 @@
/* Hook for plugins to get control in get_attavgwidth() */
get_attavgwidth_hook_type get_attavgwidth_hook = NULL;
/* Hook for plugins to get control in get_func_cost and get_func_rows */
get_func_cost_hook_type get_func_cost_hook = NULL;
get_func_rows_hook_type get_func_rows_hook = NULL;
/* ---------- AMOP CACHES ---------- */
@ -1409,6 +1412,12 @@ get_func_cost(Oid funcid)
HeapTuple tp;
float4 result;
if (get_func_cost_hook)
{
result = (*get_func_cost_hook) (funcid);
if (result > (float4) 0)
return result;
}
tp = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcid));
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for function %u", funcid);
@ -1428,6 +1437,12 @@ get_func_rows(Oid funcid)
HeapTuple tp;
float4 result;
if (get_func_rows_hook)
{
result = (*get_func_rows_hook) (funcid);
if (result > (float4) 0)
return result;
}
tp = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcid));
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for function %u", funcid);

8
src/include/utils/lsyscache.h
View File

@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/lsyscache.h,v 1.131 2010/01/04 02:44:40 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/lsyscache.h,v 1.132 2010/04/23 22:23:39 sriggs Exp $
*
*-------------------------------------------------------------------------
*/
@ -30,6 +30,12 @@ typedef enum IOFuncSelector
typedef int32 (*get_attavgwidth_hook_type) (Oid relid, AttrNumber attnum);
extern PGDLLIMPORT get_attavgwidth_hook_type get_attavgwidth_hook;
/* Hook for plugins to get control in get_func_cost and get_func_rows */
typedef float4 (*get_func_cost_hook_type) (Oid funcid);
extern PGDLLIMPORT get_func_cost_hook_type get_func_cost_hook;
typedef float4 (*get_func_rows_hook_type) (Oid funcid);
extern PGDLLIMPORT get_func_rows_hook_type get_func_rows_hook;
extern bool op_in_opfamily(Oid opno, Oid opfamily);
extern int get_op_opfamily_strategy(Oid opno, Oid opfamily);
extern void get_op_opfamily_properties(Oid opno, Oid opfamily,