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/*-------------------------------------------------------------------------
*
* istrat.c--
* index scan strategy manipulation code and index strategy manipulation
* operator code.
*
* Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/index/Attic/istrat.c,v 1.28 1998/09/01 04:26:56 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "miscadmin.h"
#include "access/heapam.h"
#include "access/istrat.h"
#include "catalog/catname.h"
#include "catalog/pg_amop.h"
#include "catalog/pg_amproc.h"
#include "catalog/pg_index.h"
#include "catalog/pg_operator.h"
#include "utils/syscache.h"
#include "fmgr.h"
#include "utils/memutils.h" /* could have been access/itup.h */
#ifdef USE_ASSERT_CHECKING
static bool StrategyEvaluationIsValid(StrategyEvaluation evaluation);
static bool StrategyExpressionIsValid(StrategyExpression expression,
StrategyNumber maxStrategy);
static ScanKey StrategyMapGetScanKeyEntry(StrategyMap map,
StrategyNumber strategyNumber);
static bool StrategyOperatorIsValid(StrategyOperator operator,
StrategyNumber maxStrategy);
static bool StrategyTermIsValid(StrategyTerm term,
StrategyNumber maxStrategy);
#endif
/* ----------------------------------------------------------------
* misc strategy support routines
* ----------------------------------------------------------------
*/
/*
* StrategyNumberIsValid
* StrategyNumberIsInBounds
* StrategyMapIsValid
* StrategyTransformMapIsValid
* IndexStrategyIsValid
*
* ... are now macros in istrat.h -cim 4/27/91
*/
/*
* StrategyMapGetScanKeyEntry --
* Returns a scan key entry of a index strategy mapping member.
*
* Note:
* Assumes that the index strategy mapping is valid.
* Assumes that the index strategy number is valid.
* Bounds checking should be done outside this routine.
*/
static ScanKey
StrategyMapGetScanKeyEntry(StrategyMap map,
StrategyNumber strategyNumber)
{
Assert(StrategyMapIsValid(map));
Assert(StrategyNumberIsValid(strategyNumber));
return &map->entry[strategyNumber - 1];
}
/*
* IndexStrategyGetStrategyMap --
* Returns an index strategy mapping of an index strategy.
*
* Note:
* Assumes that the index strategy is valid.
* Assumes that the number of index strategies is valid.
* Bounds checking should be done outside this routine.
*/
StrategyMap
IndexStrategyGetStrategyMap(IndexStrategy indexStrategy,
StrategyNumber maxStrategyNum,
AttrNumber attrNum)
{
Assert(IndexStrategyIsValid(indexStrategy));
Assert(StrategyNumberIsValid(maxStrategyNum));
Assert(AttributeNumberIsValid(attrNum));
maxStrategyNum = AMStrategies(maxStrategyNum); /* XXX */
return &indexStrategy->strategyMapData[maxStrategyNum * (attrNum - 1)];
}
/*
* AttributeNumberGetIndexStrategySize --
* Computes the size of an index strategy.
*/
Size
AttributeNumberGetIndexStrategySize(AttrNumber maxAttributeNumber,
StrategyNumber maxStrategyNumber)
{
maxStrategyNumber = AMStrategies(maxStrategyNumber); /* XXX */
return maxAttributeNumber * maxStrategyNumber * sizeof(ScanKeyData);
}
#ifdef USE_ASSERT_CHECKING
/*
* StrategyTransformMapIsValid is now a macro in istrat.h -cim 4/27/91
*/
/* ----------------
* StrategyOperatorIsValid
* ----------------
*/
static bool
StrategyOperatorIsValid(StrategyOperator operator,
StrategyNumber maxStrategy)
{
return (bool)
(PointerIsValid(operator) &&
StrategyNumberIsInBounds(operator->strategy, maxStrategy) &&
!(operator->flags & ~(SK_NEGATE | SK_COMMUTE)));
}
/* ----------------
* StrategyTermIsValid
* ----------------
*/
static bool
StrategyTermIsValid(StrategyTerm term,
StrategyNumber maxStrategy)
{
Index index;
if (!PointerIsValid(term) || term->degree == 0)
return false;
for (index = 0; index < term->degree; index += 1)
{
if (!StrategyOperatorIsValid(&term->operatorData[index],
maxStrategy))
return false;
}
return true;
}
/* ----------------
* StrategyExpressionIsValid
* ----------------
*/
static bool
StrategyExpressionIsValid(StrategyExpression expression,
StrategyNumber maxStrategy)
{
StrategyTerm *termP;
if (!PointerIsValid(expression))
return true;
if (!StrategyTermIsValid(expression->term[0], maxStrategy))
return false;
termP = &expression->term[1];
while (StrategyTermIsValid(*termP, maxStrategy))
termP += 1;
return (bool)
(!PointerIsValid(*termP));
}
/* ----------------
* StrategyEvaluationIsValid
* ----------------
*/
static bool
StrategyEvaluationIsValid(StrategyEvaluation evaluation)
{
Index index;
if (!PointerIsValid(evaluation) ||
!StrategyNumberIsValid(evaluation->maxStrategy) ||
!StrategyTransformMapIsValid(evaluation->negateTransform) ||
!StrategyTransformMapIsValid(evaluation->commuteTransform) ||
!StrategyTransformMapIsValid(evaluation->negateCommuteTransform))
{
return false;
}
for (index = 0; index < evaluation->maxStrategy; index += 1)
{
if (!StrategyExpressionIsValid(evaluation->expression[index],
evaluation->maxStrategy))
{
return false;
}
}
return true;
}
#endif
/* ----------------
* StrategyTermEvaluate
* ----------------
*/
static bool
StrategyTermEvaluate(StrategyTerm term,
StrategyMap map,
Datum left,
Datum right)
{
Index index;
long tmpres = 0;
bool result = 0;
StrategyOperator operator;
ScanKey entry;
for (index = 0, operator = &term->operatorData[0];
index < term->degree; index += 1, operator += 1)
{
entry = &map->entry[operator->strategy - 1];
Assert(RegProcedureIsValid(entry->sk_procedure));
switch (operator->flags ^ entry->sk_flags)
{
case 0x0:
tmpres = (long) FMGR_PTR2(&entry->sk_func,
left, right);
break;
case SK_NEGATE:
tmpres = (long) !FMGR_PTR2(&entry->sk_func,
left, right);
break;
case SK_COMMUTE:
tmpres = (long) FMGR_PTR2(&entry->sk_func,
right, left);
break;
case SK_NEGATE | SK_COMMUTE:
tmpres = (long) !FMGR_PTR2(&entry->sk_func,
right, left);
break;
default:
elog(FATAL, "StrategyTermEvaluate: impossible case %d",
operator->flags ^ entry->sk_flags);
}
result = (bool) tmpres;
if (!result)
return result;
}
return result;
}
/* ----------------
* RelationGetStrategy
* ----------------
*/
StrategyNumber
RelationGetStrategy(Relation relation,
AttrNumber attributeNumber,
StrategyEvaluation evaluation,
RegProcedure procedure)
{
StrategyNumber strategy;
StrategyMap strategyMap;
ScanKey entry;
Index index;
int numattrs;
Assert(RelationIsValid(relation));
numattrs = RelationGetNumberOfAttributes(relation);
Assert(relation->rd_rel->relkind == RELKIND_INDEX); /* XXX use accessor */
Assert(AttributeNumberIsValid(attributeNumber));
Assert((attributeNumber >= 1) && (attributeNumber < 1 + numattrs));
Assert(StrategyEvaluationIsValid(evaluation));
Assert(RegProcedureIsValid(procedure));
strategyMap =
IndexStrategyGetStrategyMap(RelationGetIndexStrategy(relation),
evaluation->maxStrategy,
attributeNumber);
/* get a strategy number for the procedure ignoring flags for now */
for (index = 0; index < evaluation->maxStrategy; index += 1)
{
if (strategyMap->entry[index].sk_procedure == procedure)
break;
}
if (index == evaluation->maxStrategy)
return InvalidStrategy;
strategy = 1 + index;
entry = StrategyMapGetScanKeyEntry(strategyMap, strategy);
Assert(!(entry->sk_flags & ~(SK_NEGATE | SK_COMMUTE)));
switch (entry->sk_flags & (SK_NEGATE | SK_COMMUTE))
{
case 0x0:
return strategy;
case SK_NEGATE:
strategy = evaluation->negateTransform->strategy[strategy - 1];
break;
case SK_COMMUTE:
strategy = evaluation->commuteTransform->strategy[strategy - 1];
break;
case SK_NEGATE | SK_COMMUTE:
strategy = evaluation->negateCommuteTransform->strategy[strategy - 1];
break;
default:
elog(FATAL, "RelationGetStrategy: impossible case %d", entry->sk_flags);
}
if (!StrategyNumberIsInBounds(strategy, evaluation->maxStrategy))
{
if (!StrategyNumberIsValid(strategy))
elog(ERROR, "RelationGetStrategy: corrupted evaluation");
}
return strategy;
}
/* ----------------
* RelationInvokeStrategy
* ----------------
*/
bool /* XXX someday, this may return Datum */
RelationInvokeStrategy(Relation relation,
StrategyEvaluation evaluation,
AttrNumber attributeNumber,
StrategyNumber strategy,
Datum left,
Datum right)
{
StrategyNumber newStrategy;
StrategyMap strategyMap;
ScanKey entry;
StrategyTermData termData;
int numattrs;
Assert(RelationIsValid(relation));
Assert(relation->rd_rel->relkind == RELKIND_INDEX); /* XXX use accessor */
numattrs = RelationGetNumberOfAttributes(relation);
Assert(StrategyEvaluationIsValid(evaluation));
Assert(AttributeNumberIsValid(attributeNumber));
Assert((attributeNumber >= 1) && (attributeNumber < 1 + numattrs));
Assert(StrategyNumberIsInBounds(strategy, evaluation->maxStrategy));
termData.degree = 1;
strategyMap = IndexStrategyGetStrategyMap(RelationGetIndexStrategy(relation),
evaluation->maxStrategy,
attributeNumber);
entry = StrategyMapGetScanKeyEntry(strategyMap, strategy);
if (RegProcedureIsValid(entry->sk_procedure))
{
termData.operatorData[0].strategy = strategy;
termData.operatorData[0].flags = 0x0;
return StrategyTermEvaluate(&termData, strategyMap, left, right);
}
newStrategy = evaluation->negateTransform->strategy[strategy - 1];
if (newStrategy != strategy && StrategyNumberIsValid(newStrategy))
{
entry = StrategyMapGetScanKeyEntry(strategyMap, newStrategy);
if (RegProcedureIsValid(entry->sk_procedure))
{
termData.operatorData[0].strategy = newStrategy;
termData.operatorData[0].flags = SK_NEGATE;
return StrategyTermEvaluate(&termData, strategyMap, left, right);
}
}
newStrategy = evaluation->commuteTransform->strategy[strategy - 1];
if (newStrategy != strategy && StrategyNumberIsValid(newStrategy))
{
entry = StrategyMapGetScanKeyEntry(strategyMap, newStrategy);
if (RegProcedureIsValid(entry->sk_procedure))
{
termData.operatorData[0].strategy = newStrategy;
termData.operatorData[0].flags = SK_COMMUTE;
return StrategyTermEvaluate(&termData, strategyMap, left, right);
}
}
newStrategy = evaluation->negateCommuteTransform->strategy[strategy - 1];
if (newStrategy != strategy && StrategyNumberIsValid(newStrategy))
{
entry = StrategyMapGetScanKeyEntry(strategyMap, newStrategy);
if (RegProcedureIsValid(entry->sk_procedure))
{
termData.operatorData[0].strategy = newStrategy;
termData.operatorData[0].flags = SK_NEGATE | SK_COMMUTE;
return StrategyTermEvaluate(&termData, strategyMap, left, right);
}
}
if (PointerIsValid(evaluation->expression[strategy - 1]))
{
StrategyTerm *termP;
termP = &evaluation->expression[strategy - 1]->term[0];
while (PointerIsValid(*termP))
{
Index index;
for (index = 0; index < (*termP)->degree; index += 1)
{
entry = StrategyMapGetScanKeyEntry(strategyMap,
(*termP)->operatorData[index].strategy);
if (!RegProcedureIsValid(entry->sk_procedure))
break;
}
if (index == (*termP)->degree)
return StrategyTermEvaluate(*termP, strategyMap, left, right);
termP += 1;
}
}
elog(ERROR, "RelationInvokeStrategy: cannot evaluate strategy %d",
strategy);
/* not reached, just to make compiler happy */
return FALSE;
}
/* ----------------
* OperatorRelationFillScanKeyEntry
* ----------------
*/
static void
OperatorRelationFillScanKeyEntry(Relation operatorRelation,
Oid operatorObjectId,
ScanKey entry)
{
HeapTuple tuple;
HeapScanDesc scan = NULL;
if (!IsBootstrapProcessingMode())
{
tuple = SearchSysCacheTuple(OPROID,
ObjectIdGetDatum(operatorObjectId),
0, 0, 0);
}
else
{
ScanKeyData scanKeyData;
ScanKeyEntryInitialize(&scanKeyData, 0,
ObjectIdAttributeNumber,
F_OIDEQ,
ObjectIdGetDatum(operatorObjectId));
scan = heap_beginscan(operatorRelation, false, SnapshotNow,
1, &scanKeyData);
tuple = heap_getnext(scan, 0);
}
if (!HeapTupleIsValid(tuple))
{
if (IsBootstrapProcessingMode())
heap_endscan(scan);
elog(ERROR, "OperatorObjectIdFillScanKeyEntry: unknown operator %lu",
(uint32) operatorObjectId);
}
entry->sk_flags = 0;
entry->sk_procedure = ((Form_pg_operator) GETSTRUCT(tuple))->oprcode;
fmgr_info(entry->sk_procedure, &entry->sk_func);
entry->sk_nargs = entry->sk_func.fn_nargs;
if (IsBootstrapProcessingMode())
heap_endscan(scan);
if (!RegProcedureIsValid(entry->sk_procedure))
{
elog(ERROR,
"OperatorObjectIdFillScanKeyEntry: no procedure for operator %lu",
(uint32) operatorObjectId);
}
}
/*
* IndexSupportInitialize --
* Initializes an index strategy and associated support procedures.
*/
void
IndexSupportInitialize(IndexStrategy indexStrategy,
RegProcedure *indexSupport,
Oid indexObjectId,
Oid accessMethodObjectId,
StrategyNumber maxStrategyNumber,
StrategyNumber maxSupportNumber,
AttrNumber maxAttributeNumber)
{
Relation relation = NULL;
HeapScanDesc scan = NULL;
ScanKeyData entry[2];
Relation operatorRelation;
HeapTuple tuple;
StrategyMap map;
AttrNumber attributeNumber;
int attributeIndex;
Oid operatorClassObjectId[MaxIndexAttributeNumber];
if (!IsBootstrapProcessingMode())
{
tuple = SearchSysCacheTuple(INDEXRELID,
ObjectIdGetDatum(indexObjectId),
0, 0, 0);
}
else
{
ScanKeyEntryInitialize(&entry[0], 0, Anum_pg_index_indexrelid,
F_OIDEQ,
ObjectIdGetDatum(indexObjectId));
relation = heap_openr(IndexRelationName);
scan = heap_beginscan(relation, false, SnapshotNow, 1, entry);
tuple = heap_getnext(scan, 0);
}
if (!HeapTupleIsValid(tuple))
elog(ERROR, "IndexSupportInitialize: corrupted catalogs");
maxStrategyNumber = AMStrategies(maxStrategyNumber);
/*
* XXX note that the following assumes the INDEX tuple is well formed
* and that the *key and *class are 0 terminated.
*/
for (attributeIndex = 0; attributeIndex < maxAttributeNumber; attributeIndex++)
{
Form_pg_index iform;
iform = (Form_pg_index) GETSTRUCT(tuple);
if (!OidIsValid(iform->indkey[attributeIndex]))
{
if (attributeIndex == 0)
elog(ERROR, "IndexSupportInitialize: no pg_index tuple");
break;
}
operatorClassObjectId[attributeIndex] = iform->indclass[attributeIndex];
}
if (IsBootstrapProcessingMode())
{
heap_endscan(scan);
heap_close(relation);
}
/* if support routines exist for this access method, load them */
if (maxSupportNumber > 0)
{
ScanKeyEntryInitialize(&entry[0], 0, Anum_pg_amproc_amid,
F_OIDEQ,
ObjectIdGetDatum(accessMethodObjectId));
ScanKeyEntryInitialize(&entry[1], 0, Anum_pg_amproc_amopclaid,
F_OIDEQ, 0);
relation = heap_openr(AccessMethodProcedureRelationName);
for (attributeNumber = 1; attributeNumber <= maxAttributeNumber;
attributeNumber++)
{
int16 support;
Form_pg_amproc form;
RegProcedure *loc;
loc = &indexSupport[((attributeNumber - 1) * maxSupportNumber)];
for (support = 0; support < maxSupportNumber; ++support)
loc[support] = InvalidOid;
entry[1].sk_argument =
ObjectIdGetDatum(operatorClassObjectId[attributeNumber - 1]);
scan = heap_beginscan(relation, false, SnapshotNow, 2, entry);
while (HeapTupleIsValid(tuple = heap_getnext(scan, 0)))
{
form = (Form_pg_amproc) GETSTRUCT(tuple);
loc[(form->amprocnum - 1)] = form->amproc;
}
heap_endscan(scan);
}
heap_close(relation);
}
ScanKeyEntryInitialize(&entry[0], 0,
Anum_pg_amop_amopid,
F_OIDEQ,
ObjectIdGetDatum(accessMethodObjectId));
ScanKeyEntryInitialize(&entry[1], 0,
Anum_pg_amop_amopclaid,
F_OIDEQ, 0);
relation = heap_openr(AccessMethodOperatorRelationName);
operatorRelation = heap_openr(OperatorRelationName);
for (attributeNumber = maxAttributeNumber; attributeNumber > 0;
attributeNumber--)
{
StrategyNumber strategy;
entry[1].sk_argument =
ObjectIdGetDatum(operatorClassObjectId[attributeNumber - 1]);
map = IndexStrategyGetStrategyMap(indexStrategy,
maxStrategyNumber,
attributeNumber);
for (strategy = 1; strategy <= maxStrategyNumber; strategy++)
ScanKeyEntrySetIllegal(StrategyMapGetScanKeyEntry(map, strategy));
scan = heap_beginscan(relation, false, SnapshotNow, 2, entry);
while (HeapTupleIsValid(tuple = heap_getnext(scan, 0)))
{
Form_pg_amop form;
form = (Form_pg_amop) GETSTRUCT(tuple);
OperatorRelationFillScanKeyEntry(operatorRelation,
form->amopopr,
StrategyMapGetScanKeyEntry(map, form->amopstrategy));
}
heap_endscan(scan);
}
heap_close(operatorRelation);
heap_close(relation);
}
/* ----------------
* IndexStrategyDisplay
* ----------------
*/
#ifdef ISTRATDEBUG
int
IndexStrategyDisplay(IndexStrategy indexStrategy,
StrategyNumber numberOfStrategies,
int numberOfAttributes)
{
StrategyMap strategyMap;
AttrNumber attributeNumber;
StrategyNumber strategyNumber;
for (attributeNumber = 1; attributeNumber <= numberOfAttributes;
attributeNumber += 1)
{
strategyMap = IndexStrategyGetStrategyMap(indexStrategy,
numberOfStrategies,
attributeNumber);
for (strategyNumber = 1;
strategyNumber <= AMStrategies(numberOfStrategies);
strategyNumber += 1)
{
printf(":att %d\t:str %d\t:opr 0x%x(%d)\n",
attributeNumber, strategyNumber,
strategyMap->entry[strategyNumber - 1].sk_procedure,
strategyMap->entry[strategyNumber - 1].sk_procedure);
}
}
}
#endif /* defined(ISTRATDEBUG) */
|