On Mon, 2008-09-22 at 18:41 +0100, Gregory Stark wrote:
> The easiest way to fix this seems like also the best way, instead of storing a
> boolean store the pointer to the release function.
Implemented as suggested. v5 enclosed.
--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support
Index: src/backend/utils/adt/selfuncs.c
===================================================================
RCS file: /home/sriggs/pg/REPOSITORY/pgsql/src/backend/utils/adt/selfuncs.c,v
retrieving revision 1.253
diff -c -r1.253 selfuncs.c
*** src/backend/utils/adt/selfuncs.c 25 Aug 2008 22:42:34 -0000 1.253
--- src/backend/utils/adt/selfuncs.c 25 Sep 2008 15:57:58 -0000
***************
*** 118,123 ****
--- 118,126 ----
#include "utils/selfuncs.h"
#include "utils/syscache.h"
+ /* Hook for plugins to get control when we ask for stats */
+ get_relation_stats_hook_type get_relation_stats_hook = NULL;
+ release_relation_stats_hook_type release_relation_stats_hook = NULL;
static double var_eq_const(VariableStatData *vardata, Oid operator,
Datum constval, bool constisnull,
***************
*** 3996,4005 ****
}
else if (rte->rtekind == RTE_RELATION)
{
! vardata->statsTuple = SearchSysCache(STATRELATT,
ObjectIdGetDatum(rte->relid),
Int16GetDatum(var->varattno),
0, 0);
}
else
{
--- 3999,4017 ----
}
else if (rte->rtekind == RTE_RELATION)
{
! if (get_relation_stats_hook)
! vardata->statsTuple = (*get_relation_stats_hook)
! (rte->relid,
! var->varattno,
! vardata->freefunc);
! if (!vardata->statsTuple)
! {
! vardata->statsTuple = SearchSysCache(STATRELATT,
ObjectIdGetDatum(rte->relid),
Int16GetDatum(var->varattno),
0, 0);
+ vardata->freefunc = ReleaseSysCache;
+ }
}
else
{
***************
*** 4116,4125 ****
index->indpred == NIL)
vardata->isunique = true;
/* Has it got stats? */
! vardata->statsTuple = SearchSysCache(STATRELATT,
ObjectIdGetDatum(index->indexoid),
! Int16GetDatum(pos + 1),
! 0, 0);
if (vardata->statsTuple)
break;
}
--- 4128,4147 ----
index->indpred == NIL)
vardata->isunique = true;
/* Has it got stats? */
! if (get_relation_stats_hook)
! vardata->statsTuple = (*get_relation_stats_hook)
! (index->indexoid,
! pos + 1,
! vardata->freefunc);
! if (!vardata->statsTuple)
! {
! vardata->statsTuple = SearchSysCache(STATRELATT,
ObjectIdGetDatum(index->indexoid),
! Int16GetDatum(pos + 1),
! 0, 0);
! vardata->freefunc = ReleaseSysCache;
! }
!
if (vardata->statsTuple)
break;
}
***************
*** 5551,5557 ****
double *indexCorrelation = (double *) PG_GETARG_POINTER(7);
Oid relid;
AttrNumber colnum;
! HeapTuple tuple;
double numIndexTuples;
List *indexBoundQuals;
int indexcol;
--- 5573,5580 ----
double *indexCorrelation = (double *) PG_GETARG_POINTER(7);
Oid relid;
AttrNumber colnum;
! HeapTuple tuple = NULL;
! void (*freefunc) (HeapTuple tuple) = NULL;
double numIndexTuples;
List *indexBoundQuals;
int indexcol;
***************
*** 5756,5765 ****
colnum = 1;
}
! tuple = SearchSysCache(STATRELATT,
! ObjectIdGetDatum(relid),
! Int16GetDatum(colnum),
! 0, 0);
if (HeapTupleIsValid(tuple))
{
--- 5779,5795 ----
colnum = 1;
}
! if (get_relation_stats_hook)
! tuple = (*get_relation_stats_hook) (relid, colnum, freefunc);
!
! if (!tuple)
! {
! tuple = SearchSysCache(STATRELATT,
! ObjectIdGetDatum(relid),
! Int16GetDatum(colnum),
! 0, 0);
! freefunc = ReleaseSysCache;
! }
if (HeapTupleIsValid(tuple))
{
***************
*** 5800,5806 ****
free_attstatsslot(InvalidOid, NULL, 0, numbers, nnumbers);
}
! ReleaseSysCache(tuple);
}
PG_RETURN_VOID();
--- 5830,5837 ----
free_attstatsslot(InvalidOid, NULL, 0, numbers, nnumbers);
}
!
! ReleaseStatsTuple(tuple, freefunc);
}
PG_RETURN_VOID();
Index: src/backend/utils/cache/lsyscache.c
===================================================================
RCS file: /home/sriggs/pg/REPOSITORY/pgsql/src/backend/utils/cache/lsyscache.c,v
retrieving revision 1.159
diff -c -r1.159 lsyscache.c
*** src/backend/utils/cache/lsyscache.c 2 Aug 2008 21:32:00 -0000 1.159
--- src/backend/utils/cache/lsyscache.c 25 Sep 2008 14:16:01 -0000
***************
*** 27,32 ****
--- 27,33 ----
#include "catalog/pg_proc.h"
#include "catalog/pg_statistic.h"
#include "catalog/pg_type.h"
+ #include "optimizer/plancat.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "utils/array.h"
***************
*** 35,40 ****
--- 36,43 ----
#include "utils/lsyscache.h"
#include "utils/syscache.h"
+ /* Hook for plugins to get control in get_attavgwidth() */
+ get_attavgwidth_hook_type get_attavgwidth_hook = NULL;
/* ---------- AMOP CACHES ---------- */
***************
*** 2492,2507 ****
*
* Given the table and attribute number of a column, get the average
* width of entries in the column. Return zero if no data available.
*/
int32
get_attavgwidth(Oid relid, AttrNumber attnum)
{
HeapTuple tp;
tp = SearchSysCache(STATRELATT,
! ObjectIdGetDatum(relid),
! Int16GetDatum(attnum),
! 0, 0);
if (HeapTupleIsValid(tp))
{
int32 stawidth = ((Form_pg_statistic) GETSTRUCT(tp))->stawidth;
--- 2495,2524 ----
*
* Given the table and attribute number of a column, get the average
* width of entries in the column. Return zero if no data available.
+ *
+ * Calling a hook at this point looks somewhat strange, but is required
+ * because the optimizer handles inheritance relations by calling for
+ * the avg width later in the planner than get_relation_info_hook().
+ * So the APIs and call points of hooks must match the optimizer.
*/
int32
get_attavgwidth(Oid relid, AttrNumber attnum)
{
HeapTuple tp;
+ int32 stawidth;
+
+ if (get_attavgwidth_hook)
+ {
+ stawidth = (*get_attavgwidth_hook) (relid, attnum);
+ if (stawidth > 0)
+ return stawidth;
+ }
tp = SearchSysCache(STATRELATT,
! ObjectIdGetDatum(relid),
! Int16GetDatum(attnum),
! 0, 0);
!
if (HeapTupleIsValid(tp))
{
int32 stawidth = ((Form_pg_statistic) GETSTRUCT(tp))->stawidth;
Index: src/include/optimizer/plancat.h
===================================================================
RCS file: /home/sriggs/pg/REPOSITORY/pgsql/src/include/optimizer/plancat.h,v
retrieving revision 1.51
diff -c -r1.51 plancat.h
*** src/include/optimizer/plancat.h 16 Aug 2008 00:01:38 -0000 1.51
--- src/include/optimizer/plancat.h 25 Sep 2008 15:57:06 -0000
***************
*** 14,19 ****
--- 14,20 ----
#ifndef PLANCAT_H
#define PLANCAT_H
+ #include "access/htup.h"
#include "nodes/relation.h"
#include "utils/relcache.h"
***************
*** 24,29 ****
--- 25,43 ----
RelOptInfo *rel);
extern PGDLLIMPORT get_relation_info_hook_type get_relation_info_hook;
+ /* Hooks for plugins to get control in lsyscache.c and selfuncs.c */
+ typedef HeapTuple (*get_relation_stats_hook_type) (Oid relid, AttrNumber attnum,
+ void (*freefunc) (HeapTuple tuple));
+ extern PGDLLIMPORT get_relation_stats_hook_type get_relation_stats_hook;
+
+ /* must match ReleaseSysCache call signature */
+ typedef void (*release_relation_stats_hook_type) (HeapTuple tuple);
+ extern PGDLLIMPORT release_relation_stats_hook_type release_relation_stats_hook;
+
+ typedef int32 (*get_attavgwidth_hook_type) (Oid relid, AttrNumber attnum);
+ extern PGDLLIMPORT get_attavgwidth_hook_type get_attavgwidth_hook;
+
+
extern void get_relation_info(PlannerInfo *root, Oid relationObjectId,
bool inhparent, RelOptInfo *rel);
Index: src/include/utils/selfuncs.h
===================================================================
RCS file: /home/sriggs/pg/REPOSITORY/pgsql/src/include/utils/selfuncs.h,v
retrieving revision 1.46
diff -c -r1.46 selfuncs.h
*** src/include/utils/selfuncs.h 16 Aug 2008 00:01:38 -0000 1.46
--- src/include/utils/selfuncs.h 25 Sep 2008 15:55:05 -0000
***************
*** 74,85 ****
Oid atttype; /* type to pass to get_attstatsslot */
int32 atttypmod; /* typmod to pass to get_attstatsslot */
bool isunique; /* true if matched to a unique index */
} VariableStatData;
#define ReleaseVariableStats(vardata) \
do { \
if (HeapTupleIsValid((vardata).statsTuple)) \
! ReleaseSysCache((vardata).statsTuple); \
} while(0)
--- 74,102 ----
Oid atttype; /* type to pass to get_attstatsslot */
int32 atttypmod; /* typmod to pass to get_attstatsslot */
bool isunique; /* true if matched to a unique index */
+ void (*freefunc) (HeapTuple tuple); /* funct ptr to free statsTuple */
} VariableStatData;
+ #define ReleaseStatsTuple(tuple, freefunc) \
+ do { \
+ if (HeapTupleIsValid(tuple)) \
+ { \
+ if (freefunc) \
+ freefunc(tuple); \
+ else \
+ elog(ERROR, "unable to release variable stats correctly"); \
+ } \
+ } while(0)
+
#define ReleaseVariableStats(vardata) \
do { \
if (HeapTupleIsValid((vardata).statsTuple)) \
! { \
! if ((vardata).freefunc) \
! (vardata).freefunc((vardata).statsTuple); \
! else \
! elog(ERROR, "unable to release variable stats correctly"); \
! } \
} while(0)
--
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