mirror of https://github.com/postgres/postgres
Replace SearchSysCacheGetAttribute with SysCacheGetAttr, which fetches
an attribute of a tuple previously fetched with SearchSysCacheTuple. This avoids a lot of redundant cache lookups, particularly in selfuncs.c. Also, remove SearchSysCacheStruct, which was unused and grotty.
This commit is contained in:
Tom Lane
parent
1161077e97
commit
27fee810ff
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@ -14,7 +14,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.50 2000/01/23 02:06:56 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.51 2000/01/23 03:43:23 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -587,9 +587,6 @@ getattproperties(Oid relid, AttrNumber attnum,
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* commonval, loval, hival are returned as Datums holding the internal
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* representation of the values. (Note that these should be pfree'd
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* after use if the data type is not by-value.)
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*
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* XXX currently, this does a linear search of pg_statistic because there
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* is no index nor syscache for pg_statistic. FIX THIS!
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*/
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static bool
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getattstatistics(Oid relid, AttrNumber attnum, Oid opid, Oid typid,
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@ -600,29 +597,26 @@ getattstatistics(Oid relid, AttrNumber attnum, Oid opid, Oid typid,
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Datum *loval,
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Datum *hival)
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{
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Relation rel;
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bool isnull;
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HeapTuple tuple;
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HeapTuple typeTuple;
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FmgrInfo inputproc;
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Oid typelem;
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rel = heap_openr(StatisticRelationName, AccessShareLock);
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tuple = SearchSysCacheTuple(STATRELID,
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ObjectIdGetDatum(relid),
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Int16GetDatum((int16) attnum),
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opid, 0);
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if (!HeapTupleIsValid(tuple))
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{
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/* no such stats entry */
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heap_close(rel, AccessShareLock);
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return false;
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}
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bool isnull;
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/* We assume that there will only be one entry in pg_statistic
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* for the given rel/att. Someday, VACUUM might store more than one...
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*/
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tuple = SearchSysCacheTuple(STATRELID,
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ObjectIdGetDatum(relid),
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Int16GetDatum((int16) attnum),
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opid,
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0);
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if (!HeapTupleIsValid(tuple))
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{
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/* no such stats entry */
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return false;
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}
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if (nullfrac)
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*nullfrac = ((Form_pg_statistic) GETSTRUCT(tuple))->stanullfrac;
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if (commonfrac)
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@ -639,14 +633,13 @@ getattstatistics(Oid relid, AttrNumber attnum, Oid opid, Oid typid,
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typelem = ((Form_pg_type) GETSTRUCT(typeTuple))->typelem;
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/* Values are variable-length fields, so cannot access as struct fields.
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* Must do it the hard way with heap_getattr.
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* Must do it the hard way with SysCacheGetAttr.
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*/
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if (commonval)
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{
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text *val = (text *) heap_getattr(tuple,
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Anum_pg_statistic_stacommonval,
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RelationGetDescr(rel),
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&isnull);
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text *val = (text *) SysCacheGetAttr(STATRELID, tuple,
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Anum_pg_statistic_stacommonval,
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&isnull);
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if (isnull)
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{
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elog(DEBUG, "getattstatistics: stacommonval is null");
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@ -663,10 +656,9 @@ getattstatistics(Oid relid, AttrNumber attnum, Oid opid, Oid typid,
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if (loval)
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{
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text *val = (text *) heap_getattr(tuple,
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Anum_pg_statistic_staloval,
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RelationGetDescr(rel),
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&isnull);
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text *val = (text *) SysCacheGetAttr(STATRELID, tuple,
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Anum_pg_statistic_staloval,
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&isnull);
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if (isnull)
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{
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elog(DEBUG, "getattstatistics: staloval is null");
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@ -683,10 +675,9 @@ getattstatistics(Oid relid, AttrNumber attnum, Oid opid, Oid typid,
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if (hival)
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{
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text *val = (text *) heap_getattr(tuple,
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Anum_pg_statistic_stahival,
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RelationGetDescr(rel),
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&isnull);
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text *val = (text *) SysCacheGetAttr(STATRELID, tuple,
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Anum_pg_statistic_stahival,
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&isnull);
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if (isnull)
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{
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elog(DEBUG, "getattstatistics: stahival is null");
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@ -701,7 +692,6 @@ getattstatistics(Oid relid, AttrNumber attnum, Oid opid, Oid typid,
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}
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}
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heap_close(rel, AccessShareLock);
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return true;
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}
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/cache/Attic/fcache.c,v 1.27 1999/11/22 17:56:32 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/cache/Attic/fcache.c,v 1.28 2000/01/23 03:43:24 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -74,13 +74,12 @@ init_fcache(Oid foid,
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Form_pg_proc procedureStruct;
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Form_pg_type typeStruct;
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FunctionCachePtr retval;
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text *tmp;
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int nargs;
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text *tmp;
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bool isNull;
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/* ----------------
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* get the procedure tuple corresponding to the given
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* functionOid. If this fails, returnValue has been
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* pre-initialized to "null" so we just return it.
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* get the procedure tuple corresponding to the given functionOid
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* ----------------
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*/
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retval = (FunctionCachePtr) palloc(sizeof(FunctionCache));
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@ -94,20 +93,13 @@ init_fcache(Oid foid,
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0, 0, 0);
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if (!HeapTupleIsValid(procedureTuple))
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elog(ERROR,
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"init_fcache: %s %u",
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"Cache lookup failed for procedure", foid);
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elog(ERROR, "init_fcache: Cache lookup failed for procedure %u",
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foid);
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/* ----------------
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* get the return type from the procedure tuple
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* ----------------
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*/
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procedureStruct = (Form_pg_proc) GETSTRUCT(procedureTuple);
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/* ----------------
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* get the type tuple corresponding to the return type
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* If this fails, returnValue has been pre-initialized
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* to "null" so we just return it.
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* get the return type from the procedure tuple
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* ----------------
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*/
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typeTuple = SearchSysCacheTuple(TYPEOID,
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@ -115,27 +107,24 @@ init_fcache(Oid foid,
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0, 0, 0);
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if (!HeapTupleIsValid(typeTuple))
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elog(ERROR,
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"init_fcache: %s %u",
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"Cache lookup failed for type",
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(procedureStruct)->prorettype);
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elog(ERROR, "init_fcache: Cache lookup failed for type %u",
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procedureStruct->prorettype);
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typeStruct = (Form_pg_type) GETSTRUCT(typeTuple);
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/* ----------------
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* get the type length and by-value from the type tuple and
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* save the information in our one element cache.
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* ----------------
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*/
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typeStruct = (Form_pg_type) GETSTRUCT(typeTuple);
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retval->typlen = (typeStruct)->typlen;
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if ((typeStruct)->typrelid == InvalidOid)
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retval->typlen = typeStruct->typlen;
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if (typeStruct->typrelid == InvalidOid)
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{
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/* The return type is not a relation, so just use byval */
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retval->typbyval = (typeStruct)->typbyval ? true : false;
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retval->typbyval = typeStruct->typbyval;
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}
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else
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{
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/*
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* This is a hack. We assume here that any function returning a
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* relation returns it by reference. This needs to be fixed.
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@ -147,7 +136,7 @@ init_fcache(Oid foid,
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retval->func_state = (char *) NULL;
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retval->setArg = NULL;
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retval->hasSetArg = false;
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retval->oneResult = !procedureStruct->proretset;
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retval->oneResult = ! procedureStruct->proretset;
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retval->istrusted = procedureStruct->proistrusted;
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/*
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@ -157,8 +146,8 @@ init_fcache(Oid foid,
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* allocated by the executor (i.e. slots and tuples) is freed.
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*/
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if ((retval->language == SQLlanguageId) &&
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(retval->oneResult) &&
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!(retval->typbyval))
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retval->oneResult &&
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! retval->typbyval)
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{
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Form_pg_class relationStruct;
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HeapTuple relationTuple;
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@ -198,7 +187,7 @@ init_fcache(Oid foid,
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{
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Oid *argTypes;
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retval->nullVect = (bool *) palloc((retval->nargs) * sizeof(bool));
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retval->nullVect = (bool *) palloc(retval->nargs * sizeof(bool));
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if (retval->language == SQLlanguageId)
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{
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@ -230,43 +219,36 @@ init_fcache(Oid foid,
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retval->nullVect = (BoolPtr) NULL;
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}
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/*
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* XXX this is the first varlena in the struct. If the order changes
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* for some reason this will fail.
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*/
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if (procedureStruct->prolang == SQLlanguageId)
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{
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retval->src = textout(&(procedureStruct->prosrc));
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tmp = (text *) SysCacheGetAttr(PROCOID,
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procedureTuple,
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Anum_pg_proc_prosrc,
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&isNull);
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if (isNull)
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elog(ERROR, "init_fcache: null prosrc for procedure %u",
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foid);
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retval->src = textout(tmp);
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retval->bin = (char *) NULL;
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}
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else
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{
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/*
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* I'm not sure that we even need to do this at all.
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*/
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/*
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* We do for untrusted functions.
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*/
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retval->src = (char *) NULL;
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if (procedureStruct->proistrusted)
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retval->bin = (char *) NULL;
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else
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{
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tmp = (text *)
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SearchSysCacheGetAttribute(PROCOID,
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tmp = (text *) SysCacheGetAttr(PROCOID,
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procedureTuple,
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Anum_pg_proc_probin,
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ObjectIdGetDatum(foid),
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0, 0, 0);
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&isNull);
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if (isNull)
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elog(ERROR, "init_fcache: null probin for procedure %u",
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foid);
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retval->bin = textout(tmp);
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}
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retval->src = (char *) NULL;
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}
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if (retval->language != SQLlanguageId)
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{
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fmgr_info(foid, &(retval->func));
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@ -275,7 +257,6 @@ init_fcache(Oid foid,
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else
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retval->func.fn_addr = (func_ptr) NULL;
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return retval;
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}
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@ -6,7 +6,7 @@
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* Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/cache/lsyscache.c,v 1.37 1999/12/31 03:18:43 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/cache/lsyscache.c,v 1.38 2000/01/23 03:43:24 tgl Exp $
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*
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* NOTES
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* Eventually, the index information should go through here, too.
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@ -617,35 +617,15 @@ get_typalign(Oid typid)
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Datum
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get_typdefault(Oid typid)
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{
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struct varlena *typDefault;
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int32 dataSize;
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HeapTuple typeTuple;
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Form_pg_type type;
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struct varlena *typDefault;
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bool isNull;
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int32 dataSize;
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int32 typLen;
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bool typByVal;
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Datum returnValue;
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/*
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* First, see if there is a non-null typdefault field (usually there isn't)
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*/
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typDefault = (struct varlena *)
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SearchSysCacheGetAttribute(TYPEOID,
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Anum_pg_type_typdefault,
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ObjectIdGetDatum(typid),
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0, 0, 0);
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if (typDefault == NULL)
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return PointerGetDatum(NULL);
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dataSize = VARSIZE(typDefault) - VARHDRSZ;
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/*
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* Need the type's length and byVal fields.
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*
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* XXX silly to repeat the syscache search that SearchSysCacheGetAttribute
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* just did --- but at present this path isn't taken often enough to
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* make it worth fixing.
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*/
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typeTuple = SearchSysCacheTuple(TYPEOID,
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ObjectIdGetDatum(typid),
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0, 0, 0);
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@ -654,6 +634,22 @@ get_typdefault(Oid typid)
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elog(ERROR, "get_typdefault: failed to lookup type %u", typid);
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type = (Form_pg_type) GETSTRUCT(typeTuple);
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/*
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* First, see if there is a non-null typdefault field (usually there isn't)
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*/
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typDefault = (struct varlena *) SysCacheGetAttr(TYPEOID,
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typeTuple,
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Anum_pg_type_typdefault,
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&isNull);
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if (isNull)
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return PointerGetDatum(NULL);
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/*
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* Otherwise, extract/copy the value.
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*/
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dataSize = VARSIZE(typDefault) - VARHDRSZ;
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typLen = type->typlen;
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typByVal = type->typbyval;
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|
|
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/cache/syscache.c,v 1.44 1999/11/24 17:09:27 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/cache/syscache.c,v 1.45 2000/01/23 03:43:24 tgl Exp $
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*
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* NOTES
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* These routines allow the parser/planner/executor to perform
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|
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@ -535,140 +535,42 @@ SearchSysCacheTuple(int cacheId,/* cache selection code */
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return tp;
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}
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/*
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* SearchSysCacheStruct
|
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* Fills 's' with the information retrieved by calling SearchSysCache()
|
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* with arguments key1...key4. Retrieves only the portion of the tuple
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* which is not variable-length.
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*
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* NOTE: we are assuming that non-variable-length fields in the system
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* catalogs will always be defined!
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*
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* Returns 1L if a tuple was found, 0L if not.
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*/
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int32
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SearchSysCacheStruct(int cacheId, /* cache selection code */
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char *returnStruct, /* (preallocated!) */
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Datum key1,
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Datum key2,
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Datum key3,
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Datum key4)
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{
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HeapTuple tp;
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if (!PointerIsValid(returnStruct))
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{
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elog(ERROR, "SearchSysCacheStruct: No receiving struct");
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return 0;
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}
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tp = SearchSysCacheTuple(cacheId, key1, key2, key3, key4);
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if (!HeapTupleIsValid(tp))
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return 0;
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memcpy(returnStruct, (char *) GETSTRUCT(tp), cacheinfo[cacheId].size);
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return 1;
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}
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|
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|
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/*
|
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* SearchSysCacheGetAttribute
|
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* Returns the attribute corresponding to 'attributeNumber' for
|
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* a given cached tuple. This routine usually needs to be used for
|
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* attributes that might be NULL or might be at a variable offset
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* in the tuple.
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* SysCacheGetAttr
|
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*
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* XXX This re-opens the relation, so this is slower than just pulling
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* fixed-location fields out of the struct returned by SearchSysCacheTuple.
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* Given a tuple previously fetched by SearchSysCacheTuple() or
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* SearchSysCacheTupleCopy(), extract a specific attribute.
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*
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* [callers all assume this returns a (struct varlena *). -ay 10/94]
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* This is equivalent to using heap_getattr() on a tuple fetched
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* from a non-cached relation. Usually, this is only used for attributes
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* that could be NULL or variable length; the fixed-size attributes in
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* a system table are accessed just by mapping the tuple onto the C struct
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* declarations from include/catalog/.
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*
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* As with heap_getattr(), if the attribute is of a pass-by-reference type
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* then a pointer into the tuple data area is returned --- the caller must
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* not modify or pfree the datum!
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*/
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void *
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SearchSysCacheGetAttribute(int cacheId,
|
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AttrNumber attributeNumber,
|
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Datum key1,
|
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Datum key2,
|
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Datum key3,
|
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Datum key4)
|
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Datum
|
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SysCacheGetAttr(int cacheId, HeapTuple tup,
|
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AttrNumber attributeNumber,
|
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bool *isnull)
|
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{
|
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HeapTuple tp;
|
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char *cacheName;
|
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Relation relation;
|
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int32 attributeLength,
|
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attributeByValue;
|
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bool isNull;
|
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Datum attributeValue;
|
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void *returnValue;
|
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|
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/*
|
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* Open the relation first, to ensure we are in sync with SI inval
|
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* events --- we don't want the tuple found in the cache to be
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* invalidated out from under us.
|
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* We just need to get the TupleDesc out of the cache entry,
|
||||
* and then we can apply heap_getattr(). We expect that the cache
|
||||
* control data is currently valid --- if the caller just fetched
|
||||
* the tuple, then it should be.
|
||||
*/
|
||||
cacheName = cacheinfo[cacheId].name;
|
||||
relation = heap_openr(cacheName, AccessShareLock);
|
||||
if (cacheId < 0 || cacheId >= SysCacheSize)
|
||||
elog(ERROR, "SysCacheGetAttr: Bad cache id %d", cacheId);
|
||||
if (! PointerIsValid(SysCache[cacheId]) ||
|
||||
SysCache[cacheId]->relationId == InvalidOid ||
|
||||
! PointerIsValid(SysCache[cacheId]->cc_tupdesc))
|
||||
elog(ERROR, "SysCacheGetAttr: missing cache data for id %d", cacheId);
|
||||
|
||||
tp = SearchSysCacheTuple(cacheId, key1, key2, key3, key4);
|
||||
|
||||
if (!HeapTupleIsValid(tp))
|
||||
{
|
||||
heap_close(relation, AccessShareLock);
|
||||
#ifdef CACHEDEBUG
|
||||
elog(DEBUG,
|
||||
"SearchSysCacheGetAttribute: Lookup in %s(%d) failed",
|
||||
cacheName, cacheId);
|
||||
#endif /* defined(CACHEDEBUG) */
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (attributeNumber < 0 &&
|
||||
attributeNumber > FirstLowInvalidHeapAttributeNumber)
|
||||
{
|
||||
attributeLength = heap_sysattrlen(attributeNumber);
|
||||
attributeByValue = heap_sysattrbyval(attributeNumber);
|
||||
}
|
||||
else if (attributeNumber > 0 &&
|
||||
attributeNumber <= relation->rd_rel->relnatts)
|
||||
{
|
||||
attributeLength = relation->rd_att->attrs[attributeNumber - 1]->attlen;
|
||||
attributeByValue = relation->rd_att->attrs[attributeNumber - 1]->attbyval;
|
||||
}
|
||||
else
|
||||
{
|
||||
heap_close(relation, AccessShareLock);
|
||||
elog(ERROR,
|
||||
"SearchSysCacheGetAttribute: Bad attr # %d in %s(%d)",
|
||||
attributeNumber, cacheName, cacheId);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
attributeValue = heap_getattr(tp,
|
||||
attributeNumber,
|
||||
RelationGetDescr(relation),
|
||||
&isNull);
|
||||
|
||||
if (isNull)
|
||||
{
|
||||
/*
|
||||
* Used to be an elog(DEBUG, ...) here and a claim that it should
|
||||
* be a FATAL error, I don't think either is warranted -mer 6/9/92
|
||||
*/
|
||||
heap_close(relation, AccessShareLock);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (attributeByValue)
|
||||
returnValue = (void *) attributeValue;
|
||||
else
|
||||
{
|
||||
char *tmp;
|
||||
int size = (attributeLength < 0)
|
||||
? VARSIZE((struct varlena *) attributeValue) /* variable length */
|
||||
: attributeLength; /* fixed length */
|
||||
|
||||
tmp = (char *) palloc(size);
|
||||
memcpy(tmp, (void *) attributeValue, size);
|
||||
returnValue = (void *) tmp;
|
||||
}
|
||||
|
||||
heap_close(relation, AccessShareLock);
|
||||
return returnValue;
|
||||
return heap_getattr(tup, attributeNumber,
|
||||
SysCache[cacheId]->cc_tupdesc,
|
||||
isnull);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@
|
|||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: syscache.h,v 1.22 1999/11/24 16:52:50 momjian Exp $
|
||||
* $Id: syscache.h,v 1.23 2000/01/23 03:43:22 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -81,10 +81,8 @@ extern HeapTuple SearchSysCacheTupleCopy(int cacheId,
|
|||
Datum key1, Datum key2, Datum key3, Datum key4);
|
||||
extern HeapTuple SearchSysCacheTuple(int cacheId,
|
||||
Datum key1, Datum key2, Datum key3, Datum key4);
|
||||
extern int32 SearchSysCacheStruct(int cacheId, char *returnStruct,
|
||||
Datum key1, Datum key2, Datum key3, Datum key4);
|
||||
extern void *SearchSysCacheGetAttribute(int cacheId,
|
||||
AttrNumber attributeNumber,
|
||||
Datum key1, Datum key2, Datum key3, Datum key4);
|
||||
extern Datum SysCacheGetAttr(int cacheId, HeapTuple tup,
|
||||
AttrNumber attributeNumber,
|
||||
bool *isnull);
|
||||
|
||||
#endif /* SYSCACHE_H */
|
||||
|
|
|
|||
Loading…
Reference in New Issue