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postgres/src/backend/utils/cache/lsyscache.c
Neil Conway f76730e35a Small patch to move get_grosysid() from catalog/aclchk.c to 
utils/cache/lsyscache.c where it can be used by other things.  Also
cleans up both get_usesysid() and get_grosysid() a bit. From Stephen
Frost.
2005-01-27 23:36:15 +00:00

2083 lines
44 KiB
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/*-------------------------------------------------------------------------
*
* lsyscache.c
* Convenience routines for common queries in the system catalog cache.
*
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/lsyscache.c,v 1.120 2005/01/27 23:36:12 neilc Exp $
*
* NOTES
* Eventually, the index information should go through here, too.
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "miscadmin.h"
#include "access/hash.h"
#include "access/tupmacs.h"
#include "catalog/pg_amop.h"
#include "catalog/pg_amproc.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_opclass.h"
#include "catalog/pg_operator.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_shadow.h"
#include "catalog/pg_group.h"
#include "catalog/pg_statistic.h"
#include "catalog/pg_type.h"
#include "nodes/makefuncs.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/catcache.h"
#include "utils/datum.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
/* ---------- AMOP CACHES ---------- */
/*
* op_in_opclass
*
* Return t iff operator 'opno' is in operator class 'opclass'.
*/
bool
op_in_opclass(Oid opno, Oid opclass)
{
return SearchSysCacheExists(AMOPOPID,
ObjectIdGetDatum(opno),
ObjectIdGetDatum(opclass),
0, 0);
}
/*
* get_op_opclass_properties
*
* Get the operator's strategy number, subtype, and recheck (lossy) flag
* within the specified opclass.
*
* Caller should already have verified that opno is a member of opclass,
* therefore we raise an error if the tuple is not found.
*/
void
get_op_opclass_properties(Oid opno, Oid opclass,
int *strategy, Oid *subtype, bool *recheck)
{
HeapTuple tp;
Form_pg_amop amop_tup;
tp = SearchSysCache(AMOPOPID,
ObjectIdGetDatum(opno),
ObjectIdGetDatum(opclass),
0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "operator %u is not a member of opclass %u",
opno, opclass);
amop_tup = (Form_pg_amop) GETSTRUCT(tp);
*strategy = amop_tup->amopstrategy;
*subtype = amop_tup->amopsubtype;
*recheck = amop_tup->amopreqcheck;
ReleaseSysCache(tp);
}
/*
* get_opclass_member
* Get the OID of the operator that implements the specified strategy
* with the specified subtype for the specified opclass.
*
* Returns InvalidOid if there is no pg_amop entry for the given keys.
*/
Oid
get_opclass_member(Oid opclass, Oid subtype, int16 strategy)
{
HeapTuple tp;
Form_pg_amop amop_tup;
Oid result;
tp = SearchSysCache(AMOPSTRATEGY,
ObjectIdGetDatum(opclass),
ObjectIdGetDatum(subtype),
Int16GetDatum(strategy),
0);
if (!HeapTupleIsValid(tp))
return InvalidOid;
amop_tup = (Form_pg_amop) GETSTRUCT(tp);
result = amop_tup->amopopr;
ReleaseSysCache(tp);
return result;
}
/*
* get_op_hash_function
* Get the OID of the datatype-specific hash function associated with
* a hashable equality operator.
*
* Returns InvalidOid if no hash function can be found. (This indicates
* that the operator should not have been marked oprcanhash.)
*/
Oid
get_op_hash_function(Oid opno)
{
CatCList *catlist;
int i;
Oid opclass = InvalidOid;
/*
* Search pg_amop to see if the target operator is registered as the
* "=" operator of any hash opclass. If the operator is registered in
* multiple opclasses, assume we can use the associated hash function
* from any one.
*/
catlist = SearchSysCacheList(AMOPOPID, 1,
ObjectIdGetDatum(opno),
0, 0, 0);
for (i = 0; i < catlist->n_members; i++)
{
HeapTuple tuple = &catlist->members[i]->tuple;
Form_pg_amop aform = (Form_pg_amop) GETSTRUCT(tuple);
if (aform->amopstrategy == HTEqualStrategyNumber &&
opclass_is_hash(aform->amopclaid))
{
opclass = aform->amopclaid;
break;
}
}
ReleaseSysCacheList(catlist);
if (OidIsValid(opclass))
{
/* Found a suitable opclass, get its default hash support function */
return get_opclass_proc(opclass, InvalidOid, HASHPROC);
}
/* Didn't find a match... */
return InvalidOid;
}
/* ---------- AMPROC CACHES ---------- */
/*
* get_opclass_proc
* Get the OID of the specified support function
* for the specified opclass and subtype.
*
* Returns InvalidOid if there is no pg_amproc entry for the given keys.
*/
Oid
get_opclass_proc(Oid opclass, Oid subtype, int16 procnum)
{
HeapTuple tp;
Form_pg_amproc amproc_tup;
RegProcedure result;
tp = SearchSysCache(AMPROCNUM,
ObjectIdGetDatum(opclass),
ObjectIdGetDatum(subtype),
Int16GetDatum(procnum),
0);
if (!HeapTupleIsValid(tp))
return InvalidOid;
amproc_tup = (Form_pg_amproc) GETSTRUCT(tp);
result = amproc_tup->amproc;
ReleaseSysCache(tp);
return result;
}
/* ---------- ATTRIBUTE CACHES ---------- */
/*
* get_attname
* Given the relation id and the attribute number,
* return the "attname" field from the attribute relation.
*
* Note: returns a palloc'd copy of the string, or NULL if no such attribute.
*/
char *
get_attname(Oid relid, AttrNumber attnum)
{
HeapTuple tp;
tp = SearchSysCache(ATTNUM,
ObjectIdGetDatum(relid),
Int16GetDatum(attnum),
0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_attribute att_tup = (Form_pg_attribute) GETSTRUCT(tp);
char *result;
result = pstrdup(NameStr(att_tup->attname));
ReleaseSysCache(tp);
return result;
}
else
return NULL;
}
/*
* get_relid_attribute_name
*
* Same as above routine get_attname(), except that error
* is handled by elog() instead of returning NULL.
*/
char *
get_relid_attribute_name(Oid relid, AttrNumber attnum)
{
char *attname;
attname = get_attname(relid, attnum);
if (attname == NULL)
elog(ERROR, "cache lookup failed for attribute %d of relation %u",
attnum, relid);
return attname;
}
/*
* get_attnum
*
* Given the relation id and the attribute name,
* return the "attnum" field from the attribute relation.
*
* Returns InvalidAttrNumber if the attr doesn't exist (or is dropped).
*/
AttrNumber
get_attnum(Oid relid, const char *attname)
{
HeapTuple tp;
tp = SearchSysCacheAttName(relid, attname);
if (HeapTupleIsValid(tp))
{
Form_pg_attribute att_tup = (Form_pg_attribute) GETSTRUCT(tp);
AttrNumber result;
result = att_tup->attnum;
ReleaseSysCache(tp);
return result;
}
else
return InvalidAttrNumber;
}
/*
* get_atttype
*
* Given the relation OID and the attribute number with the relation,
* return the attribute type OID.
*/
Oid
get_atttype(Oid relid, AttrNumber attnum)
{
HeapTuple tp;
tp = SearchSysCache(ATTNUM,
ObjectIdGetDatum(relid),
Int16GetDatum(attnum),
0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_attribute att_tup = (Form_pg_attribute) GETSTRUCT(tp);
Oid result;
result = att_tup->atttypid;
ReleaseSysCache(tp);
return result;
}
else
return InvalidOid;
}
/*
* get_atttypmod
*
* Given the relation id and the attribute number,
* return the "atttypmod" field from the attribute relation.
*/
int32
get_atttypmod(Oid relid, AttrNumber attnum)
{
HeapTuple tp;
tp = SearchSysCache(ATTNUM,
ObjectIdGetDatum(relid),
Int16GetDatum(attnum),
0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_attribute att_tup = (Form_pg_attribute) GETSTRUCT(tp);
int32 result;
result = att_tup->atttypmod;
ReleaseSysCache(tp);
return result;
}
else
return -1;
}
/*
* get_atttypetypmod
*
* A two-fer: given the relation id and the attribute number,
* fetch both type OID and atttypmod in a single cache lookup.
*
* Unlike the otherwise-similar get_atttype/get_atttypmod, this routine
* raises an error if it can't obtain the information.
*/
void
get_atttypetypmod(Oid relid, AttrNumber attnum,
Oid *typid, int32 *typmod)
{
HeapTuple tp;
Form_pg_attribute att_tup;
tp = SearchSysCache(ATTNUM,
ObjectIdGetDatum(relid),
Int16GetDatum(attnum),
0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for attribute %d of relation %u",
attnum, relid);
att_tup = (Form_pg_attribute) GETSTRUCT(tp);
*typid = att_tup->atttypid;
*typmod = att_tup->atttypmod;
ReleaseSysCache(tp);
}
/* ---------- INDEX CACHE ---------- */
/* watch this space...
*/
/* ---------- OPCLASS CACHE ---------- */
/*
* opclass_is_btree
*
* Returns TRUE iff the specified opclass is associated with the
* btree index access method.
*/
bool
opclass_is_btree(Oid opclass)
{
HeapTuple tp;
Form_pg_opclass cla_tup;
bool result;
tp = SearchSysCache(CLAOID,
ObjectIdGetDatum(opclass),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for opclass %u", opclass);
cla_tup = (Form_pg_opclass) GETSTRUCT(tp);
result = (cla_tup->opcamid == BTREE_AM_OID);
ReleaseSysCache(tp);
return result;
}
/*
* opclass_is_hash
*
* Returns TRUE iff the specified opclass is associated with the
* hash index access method.
*/
bool
opclass_is_hash(Oid opclass)
{
HeapTuple tp;
Form_pg_opclass cla_tup;
bool result;
tp = SearchSysCache(CLAOID,
ObjectIdGetDatum(opclass),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for opclass %u", opclass);
cla_tup = (Form_pg_opclass) GETSTRUCT(tp);
result = (cla_tup->opcamid == HASH_AM_OID);
ReleaseSysCache(tp);
return result;
}
/* ---------- OPERATOR CACHE ---------- */
/*
* get_opcode
*
* Returns the regproc id of the routine used to implement an
* operator given the operator oid.
*/
RegProcedure
get_opcode(Oid opno)
{
HeapTuple tp;
tp = SearchSysCache(OPEROID,
ObjectIdGetDatum(opno),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_operator optup = (Form_pg_operator) GETSTRUCT(tp);
RegProcedure result;
result = optup->oprcode;
ReleaseSysCache(tp);
return result;
}
else
return (RegProcedure) InvalidOid;
}
/*
* get_opname
* returns the name of the operator with the given opno
*
* Note: returns a palloc'd copy of the string, or NULL if no such operator.
*/
char *
get_opname(Oid opno)
{
HeapTuple tp;
tp = SearchSysCache(OPEROID,
ObjectIdGetDatum(opno),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_operator optup = (Form_pg_operator) GETSTRUCT(tp);
char *result;
result = pstrdup(NameStr(optup->oprname));
ReleaseSysCache(tp);
return result;
}
else
return NULL;
}
/*
* op_input_types
*
* Returns the left and right input datatypes for an operator
* (InvalidOid if not relevant).
*/
void
op_input_types(Oid opno, Oid *lefttype, Oid *righttype)
{
HeapTuple tp;
Form_pg_operator optup;
tp = SearchSysCache(OPEROID,
ObjectIdGetDatum(opno),
0, 0, 0);
if (!HeapTupleIsValid(tp)) /* shouldn't happen */
elog(ERROR, "cache lookup failed for operator %u", opno);
optup = (Form_pg_operator) GETSTRUCT(tp);
*lefttype = optup->oprleft;
*righttype = optup->oprright;
ReleaseSysCache(tp);
}
/*
* op_mergejoinable
*
* Returns the left and right sort operators corresponding to a
* mergejoinable operator, or false if the operator is not mergejoinable.
*/
bool
op_mergejoinable(Oid opno, Oid *leftOp, Oid *rightOp)
{
HeapTuple tp;
bool result = false;
tp = SearchSysCache(OPEROID,
ObjectIdGetDatum(opno),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_operator optup = (Form_pg_operator) GETSTRUCT(tp);
if (optup->oprlsortop &&
optup->oprrsortop)
{
*leftOp = optup->oprlsortop;
*rightOp = optup->oprrsortop;
result = true;
}
ReleaseSysCache(tp);
}
return result;
}
/*
* op_mergejoin_crossops
*
* Returns the cross-type comparison operators (ltype "<" rtype and
* ltype ">" rtype) for an operator previously determined to be
* mergejoinable. Optionally, fetches the regproc ids of these
* operators, as well as their operator OIDs.
*/
void
op_mergejoin_crossops(Oid opno, Oid *ltop, Oid *gtop,
RegProcedure *ltproc, RegProcedure *gtproc)
{
HeapTuple tp;
Form_pg_operator optup;
/*
* Get the declared comparison operators of the operator.
*/
tp = SearchSysCache(OPEROID,
ObjectIdGetDatum(opno),
0, 0, 0);
if (!HeapTupleIsValid(tp)) /* shouldn't happen */
elog(ERROR, "cache lookup failed for operator %u", opno);
optup = (Form_pg_operator) GETSTRUCT(tp);
*ltop = optup->oprltcmpop;
*gtop = optup->oprgtcmpop;
ReleaseSysCache(tp);
/* Check < op provided */
if (!OidIsValid(*ltop))
elog(ERROR, "mergejoin operator %u has no matching < operator",
opno);
if (ltproc)
*ltproc = get_opcode(*ltop);
/* Check > op provided */
if (!OidIsValid(*gtop))
elog(ERROR, "mergejoin operator %u has no matching > operator",
opno);
if (gtproc)
*gtproc = get_opcode(*gtop);
}
/*
* op_hashjoinable
*
* Returns true if the operator is hashjoinable.
*/
bool
op_hashjoinable(Oid opno)
{
HeapTuple tp;
bool result = false;
tp = SearchSysCache(OPEROID,
ObjectIdGetDatum(opno),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_operator optup = (Form_pg_operator) GETSTRUCT(tp);
result = optup->oprcanhash;
ReleaseSysCache(tp);
}
return result;
}
/*
* op_strict
*
* Get the proisstrict flag for the operator's underlying function.
*/
bool
op_strict(Oid opno)
{
RegProcedure funcid = get_opcode(opno);
if (funcid == (RegProcedure) InvalidOid)
elog(ERROR, "operator %u does not exist", opno);
return func_strict((Oid) funcid);
}
/*
* op_volatile
*
* Get the provolatile flag for the operator's underlying function.
*/
char
op_volatile(Oid opno)
{
RegProcedure funcid = get_opcode(opno);
if (funcid == (RegProcedure) InvalidOid)
elog(ERROR, "operator %u does not exist", opno);
return func_volatile((Oid) funcid);
}
/*
* get_commutator
*
* Returns the corresponding commutator of an operator.
*/
Oid
get_commutator(Oid opno)
{
HeapTuple tp;
tp = SearchSysCache(OPEROID,
ObjectIdGetDatum(opno),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_operator optup = (Form_pg_operator) GETSTRUCT(tp);
Oid result;
result = optup->oprcom;
ReleaseSysCache(tp);
return result;
}
else
return InvalidOid;
}
/*
* get_negator
*
* Returns the corresponding negator of an operator.
*/
Oid
get_negator(Oid opno)
{
HeapTuple tp;
tp = SearchSysCache(OPEROID,
ObjectIdGetDatum(opno),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_operator optup = (Form_pg_operator) GETSTRUCT(tp);
Oid result;
result = optup->oprnegate;
ReleaseSysCache(tp);
return result;
}
else
return InvalidOid;
}
/*
* get_oprrest
*
* Returns procedure id for computing selectivity of an operator.
*/
RegProcedure
get_oprrest(Oid opno)
{
HeapTuple tp;
tp = SearchSysCache(OPEROID,
ObjectIdGetDatum(opno),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_operator optup = (Form_pg_operator) GETSTRUCT(tp);
RegProcedure result;
result = optup->oprrest;
ReleaseSysCache(tp);
return result;
}
else
return (RegProcedure) InvalidOid;
}
/*
* get_oprjoin
*
* Returns procedure id for computing selectivity of a join.
*/
RegProcedure
get_oprjoin(Oid opno)
{
HeapTuple tp;
tp = SearchSysCache(OPEROID,
ObjectIdGetDatum(opno),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_operator optup = (Form_pg_operator) GETSTRUCT(tp);
RegProcedure result;
result = optup->oprjoin;
ReleaseSysCache(tp);
return result;
}
else
return (RegProcedure) InvalidOid;
}
/* ---------- FUNCTION CACHE ---------- */
/*
* get_func_name
* returns the name of the function with the given funcid
*
* Note: returns a palloc'd copy of the string, or NULL if no such function.
*/
char *
get_func_name(Oid funcid)
{
HeapTuple tp;
tp = SearchSysCache(PROCOID,
ObjectIdGetDatum(funcid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_proc functup = (Form_pg_proc) GETSTRUCT(tp);
char *result;
result = pstrdup(NameStr(functup->proname));
ReleaseSysCache(tp);
return result;
}
else
return NULL;
}
/*
* get_func_rettype
* Given procedure id, return the function's result type.
*/
Oid
get_func_rettype(Oid funcid)
{
HeapTuple tp;
Oid result;
tp = SearchSysCache(PROCOID,
ObjectIdGetDatum(funcid),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for function %u", funcid);
result = ((Form_pg_proc) GETSTRUCT(tp))->prorettype;
ReleaseSysCache(tp);
return result;
}
/*
* get_func_signature
* Given procedure id, return the function's argument and result types.
* (The return value is the result type.)
*
* argtypes must point to a vector of size FUNC_MAX_ARGS.
*/
Oid
get_func_signature(Oid funcid, Oid *argtypes, int *nargs)
{
HeapTuple tp;
Form_pg_proc procstruct;
Oid result;
tp = SearchSysCache(PROCOID,
ObjectIdGetDatum(funcid),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for function %u", funcid);
procstruct = (Form_pg_proc) GETSTRUCT(tp);
result = procstruct->prorettype;
memcpy(argtypes, procstruct->proargtypes, FUNC_MAX_ARGS * sizeof(Oid));
*nargs = (int) procstruct->pronargs;
ReleaseSysCache(tp);
return result;
}
/*
* get_func_retset
* Given procedure id, return the function's proretset flag.
*/
bool
get_func_retset(Oid funcid)
{
HeapTuple tp;
bool result;
tp = SearchSysCache(PROCOID,
ObjectIdGetDatum(funcid),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for function %u", funcid);
result = ((Form_pg_proc) GETSTRUCT(tp))->proretset;
ReleaseSysCache(tp);
return result;
}
/*
* func_strict
* Given procedure id, return the function's proisstrict flag.
*/
bool
func_strict(Oid funcid)
{
HeapTuple tp;
bool result;
tp = SearchSysCache(PROCOID,
ObjectIdGetDatum(funcid),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for function %u", funcid);
result = ((Form_pg_proc) GETSTRUCT(tp))->proisstrict;
ReleaseSysCache(tp);
return result;
}
/*
* func_volatile
* Given procedure id, return the function's provolatile flag.
*/
char
func_volatile(Oid funcid)
{
HeapTuple tp;
char result;
tp = SearchSysCache(PROCOID,
ObjectIdGetDatum(funcid),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for function %u", funcid);
result = ((Form_pg_proc) GETSTRUCT(tp))->provolatile;
ReleaseSysCache(tp);
return result;
}
/* ---------- RELATION CACHE ---------- */
/*
* get_relname_relid
* Given name and namespace of a relation, look up the OID.
*
* Returns InvalidOid if there is no such relation.
*/
Oid
get_relname_relid(const char *relname, Oid relnamespace)
{
return GetSysCacheOid(RELNAMENSP,
PointerGetDatum(relname),
ObjectIdGetDatum(relnamespace),
0, 0);
}
/*
* get_system_catalog_relid
* Get the OID of a system catalog identified by name.
*/
Oid
get_system_catalog_relid(const char *catname)
{
Oid relid;
relid = GetSysCacheOid(RELNAMENSP,
PointerGetDatum(catname),
ObjectIdGetDatum(PG_CATALOG_NAMESPACE),
0, 0);
if (!OidIsValid(relid))
elog(ERROR, "cache lookup failed for system relation %s", catname);
return relid;
}
#ifdef NOT_USED
/*
* get_relnatts
*
* Returns the number of attributes for a given relation.
*/
int
get_relnatts(Oid relid)
{
HeapTuple tp;
tp = SearchSysCache(RELOID,
ObjectIdGetDatum(relid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_class reltup = (Form_pg_class) GETSTRUCT(tp);
int result;
result = reltup->relnatts;
ReleaseSysCache(tp);
return result;
}
else
return InvalidAttrNumber;
}
#endif
/*
* get_rel_name
* Returns the name of a given relation.
*
* Returns a palloc'd copy of the string, or NULL if no such relation.
*
* NOTE: since relation name is not unique, be wary of code that uses this
* for anything except preparing error messages.
*/
char *
get_rel_name(Oid relid)
{
HeapTuple tp;
tp = SearchSysCache(RELOID,
ObjectIdGetDatum(relid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_class reltup = (Form_pg_class) GETSTRUCT(tp);
char *result;
result = pstrdup(NameStr(reltup->relname));
ReleaseSysCache(tp);
return result;
}
else
return NULL;
}
/*
* get_rel_namespace
*
* Returns the pg_namespace OID associated with a given relation.
*/
Oid
get_rel_namespace(Oid relid)
{
HeapTuple tp;
tp = SearchSysCache(RELOID,
ObjectIdGetDatum(relid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_class reltup = (Form_pg_class) GETSTRUCT(tp);
Oid result;
result = reltup->relnamespace;
ReleaseSysCache(tp);
return result;
}
else
return InvalidOid;
}
/*
* get_rel_type_id
*
* Returns the pg_type OID associated with a given relation.
*
* Note: not all pg_class entries have associated pg_type OIDs; so be
* careful to check for InvalidOid result.
*/
Oid
get_rel_type_id(Oid relid)
{
HeapTuple tp;
tp = SearchSysCache(RELOID,
ObjectIdGetDatum(relid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_class reltup = (Form_pg_class) GETSTRUCT(tp);
Oid result;
result = reltup->reltype;
ReleaseSysCache(tp);
return result;
}
else
return InvalidOid;
}
/*
* get_rel_relkind
*
* Returns the relkind associated with a given relation.
*/
char
get_rel_relkind(Oid relid)
{
HeapTuple tp;
tp = SearchSysCache(RELOID,
ObjectIdGetDatum(relid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_class reltup = (Form_pg_class) GETSTRUCT(tp);
char result;
result = reltup->relkind;
ReleaseSysCache(tp);
return result;
}
else
return '\0';
}
/* ---------- TYPE CACHE ---------- */
/*
* get_typisdefined
*
* Given the type OID, determine whether the type is defined
* (if not, it's only a shell).
*/
bool
get_typisdefined(Oid typid)
{
HeapTuple tp;
tp = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_type typtup = (Form_pg_type) GETSTRUCT(tp);
bool result;
result = typtup->typisdefined;
ReleaseSysCache(tp);
return result;
}
else
return false;
}
/*
* get_typlen
*
* Given the type OID, return the length of the type.
*/
int16
get_typlen(Oid typid)
{
HeapTuple tp;
tp = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_type typtup = (Form_pg_type) GETSTRUCT(tp);
int16 result;
result = typtup->typlen;
ReleaseSysCache(tp);
return result;
}
else
return 0;
}
/*
* get_typbyval
*
* Given the type OID, determine whether the type is returned by value or
* not. Returns true if by value, false if by reference.
*/
bool
get_typbyval(Oid typid)
{
HeapTuple tp;
tp = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_type typtup = (Form_pg_type) GETSTRUCT(tp);
bool result;
result = typtup->typbyval;
ReleaseSysCache(tp);
return result;
}
else
return false;
}
/*
* get_typlenbyval
*
* A two-fer: given the type OID, return both typlen and typbyval.
*
* Since both pieces of info are needed to know how to copy a Datum,
* many places need both. Might as well get them with one cache lookup
* instead of two. Also, this routine raises an error instead of
* returning a bogus value when given a bad type OID.
*/
void
get_typlenbyval(Oid typid, int16 *typlen, bool *typbyval)
{
HeapTuple tp;
Form_pg_type typtup;
tp = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for type %u", typid);
typtup = (Form_pg_type) GETSTRUCT(tp);
*typlen = typtup->typlen;
*typbyval = typtup->typbyval;
ReleaseSysCache(tp);
}
/*
* get_typlenbyvalalign
*
* A three-fer: given the type OID, return typlen, typbyval, typalign.
*/
void
get_typlenbyvalalign(Oid typid, int16 *typlen, bool *typbyval,
char *typalign)
{
HeapTuple tp;
Form_pg_type typtup;
tp = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for type %u", typid);
typtup = (Form_pg_type) GETSTRUCT(tp);
*typlen = typtup->typlen;
*typbyval = typtup->typbyval;
*typalign = typtup->typalign;
ReleaseSysCache(tp);
}
/*
* getTypeIOParam
* Given a pg_type row, select the type OID to pass to I/O functions
*
* Formerly, all I/O functions were passed pg_type.typelem as their second
* parameter, but we now have a more complex rule about what to pass.
* This knowledge is intended to be centralized here --- direct references
* to typelem elsewhere in the code are wrong, if they are associated with
* I/O calls and not with actual subscripting operations! (But see
* bootstrap.c, which can't conveniently use this routine.)
*/
Oid
getTypeIOParam(HeapTuple typeTuple)
{
Form_pg_type typeStruct = (Form_pg_type) GETSTRUCT(typeTuple);
/*
* Composite types get their own OID as parameter; array types get
* their typelem as parameter; everybody else gets zero.
*/
if (typeStruct->typtype == 'c')
return HeapTupleGetOid(typeTuple);
else
return typeStruct->typelem;
}
/*
* get_type_io_data
*
* A six-fer: given the type OID, return typlen, typbyval, typalign,
* typdelim, typioparam, and IO function OID. The IO function
* returned is controlled by IOFuncSelector
*/
void
get_type_io_data(Oid typid,
IOFuncSelector which_func,
int16 *typlen,
bool *typbyval,
char *typalign,
char *typdelim,
Oid *typioparam,
Oid *func)
{
HeapTuple typeTuple;
Form_pg_type typeStruct;
typeTuple = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (!HeapTupleIsValid(typeTuple))
elog(ERROR, "cache lookup failed for type %u", typid);
typeStruct = (Form_pg_type) GETSTRUCT(typeTuple);
*typlen = typeStruct->typlen;
*typbyval = typeStruct->typbyval;
*typalign = typeStruct->typalign;
*typdelim = typeStruct->typdelim;
*typioparam = getTypeIOParam(typeTuple);
switch (which_func)
{
case IOFunc_input:
*func = typeStruct->typinput;
break;
case IOFunc_output:
*func = typeStruct->typoutput;
break;
case IOFunc_receive:
*func = typeStruct->typreceive;
break;
case IOFunc_send:
*func = typeStruct->typsend;
break;
}
ReleaseSysCache(typeTuple);
}
#ifdef NOT_USED
char
get_typalign(Oid typid)
{
HeapTuple tp;
tp = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_type typtup = (Form_pg_type) GETSTRUCT(tp);
char result;
result = typtup->typalign;
ReleaseSysCache(tp);
return result;
}
else
return 'i';
}
#endif
char
get_typstorage(Oid typid)
{
HeapTuple tp;
tp = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_type typtup = (Form_pg_type) GETSTRUCT(tp);
char result;
result = typtup->typstorage;
ReleaseSysCache(tp);
return result;
}
else
return 'p';
}
/*
* get_typtypmod
*
* Given the type OID, return the typtypmod field (domain's typmod
* for base type)
*/
int32
get_typtypmod(Oid typid)
{
HeapTuple tp;
tp = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_type typtup = (Form_pg_type) GETSTRUCT(tp);
int32 result;
result = typtup->typtypmod;
ReleaseSysCache(tp);
return result;
}
else
return -1;
}
/*
* get_typdefault
* Given a type OID, return the type's default value, if any.
*
* The result is a palloc'd expression node tree, or NULL if there
* is no defined default for the datatype.
*
* NB: caller should be prepared to coerce result to correct datatype;
* the returned expression tree might produce something of the wrong type.
*/
Node *
get_typdefault(Oid typid)
{
HeapTuple typeTuple;
Form_pg_type type;
Datum datum;
bool isNull;
Node *expr;
typeTuple = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (!HeapTupleIsValid(typeTuple))
elog(ERROR, "cache lookup failed for type %u", typid);
type = (Form_pg_type) GETSTRUCT(typeTuple);
/*
* typdefault and typdefaultbin are potentially null, so don't try to
* access 'em as struct fields. Must do it the hard way with
* SysCacheGetAttr.
*/
datum = SysCacheGetAttr(TYPEOID,
typeTuple,
Anum_pg_type_typdefaultbin,
&isNull);
if (!isNull)
{
/* We have an expression default */
expr = stringToNode(DatumGetCString(DirectFunctionCall1(textout,
datum)));
}
else
{
/* Perhaps we have a plain literal default */
datum = SysCacheGetAttr(TYPEOID,
typeTuple,
Anum_pg_type_typdefault,
&isNull);
if (!isNull)
{
char *strDefaultVal;
/* Convert text datum to C string */
strDefaultVal = DatumGetCString(DirectFunctionCall1(textout,
datum));
/* Convert C string to a value of the given type */
datum = OidFunctionCall3(type->typinput,
CStringGetDatum(strDefaultVal),
ObjectIdGetDatum(getTypeIOParam(typeTuple)),
Int32GetDatum(-1));
/* Build a Const node containing the value */
expr = (Node *) makeConst(typid,
type->typlen,
datum,
false,
type->typbyval);
pfree(strDefaultVal);
}
else
{
/* No default */
expr = NULL;
}
}
ReleaseSysCache(typeTuple);
return expr;
}
/*
* getBaseType
* If the given type is a domain, return its base type;
* otherwise return the type's own OID.
*/
Oid
getBaseType(Oid typid)
{
/*
* We loop to find the bottom base type in a stack of domains.
*/
for (;;)
{
HeapTuple tup;
Form_pg_type typTup;
tup = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (!HeapTupleIsValid(tup))
elog(ERROR, "cache lookup failed for type %u", typid);
typTup = (Form_pg_type) GETSTRUCT(tup);
if (typTup->typtype != 'd')
{
/* Not a domain, so done */
ReleaseSysCache(tup);
break;
}
typid = typTup->typbasetype;
ReleaseSysCache(tup);
}
return typid;
}
/*
* get_typavgwidth
*
* Given a type OID and a typmod value (pass -1 if typmod is unknown),
* estimate the average width of values of the type. This is used by
* the planner, which doesn't require absolutely correct results;
* it's OK (and expected) to guess if we don't know for sure.
*/
int32
get_typavgwidth(Oid typid, int32 typmod)
{
int typlen = get_typlen(typid);
int32 maxwidth;
/*
* Easy if it's a fixed-width type
*/
if (typlen > 0)
return typlen;
/*
* type_maximum_size knows the encoding of typmod for some datatypes;
* don't duplicate that knowledge here.
*/
maxwidth = type_maximum_size(typid, typmod);
if (maxwidth > 0)
{
/*
* For BPCHAR, the max width is also the only width. Otherwise we
* need to guess about the typical data width given the max. A
* sliding scale for percentage of max width seems reasonable.
*/
if (typid == BPCHAROID)
return maxwidth;
if (maxwidth <= 32)
return maxwidth; /* assume full width */
if (maxwidth < 1000)
return 32 + (maxwidth - 32) / 2; /* assume 50% */
/*
* Beyond 1000, assume we're looking at something like
* "varchar(10000)" where the limit isn't actually reached often,
* and use a fixed estimate.
*/
return 32 + (1000 - 32) / 2;
}
/*
* Ooops, we have no idea ... wild guess time.
*/
return 32;
}
/*
* get_typtype
*
* Given the type OID, find if it is a basic type, a complex type, etc.
* It returns the null char if the cache lookup fails...
*/
char
get_typtype(Oid typid)
{
HeapTuple tp;
tp = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_type typtup = (Form_pg_type) GETSTRUCT(tp);
char result;
result = typtup->typtype;
ReleaseSysCache(tp);
return result;
}
else
return '\0';
}
/*
* get_type_func_class
*
* Given the type OID, obtain its TYPEFUNC classification.
*
* This is intended to centralize a bunch of formerly ad-hoc code for
* classifying types. The categories used here are useful for deciding
* how to handle functions returning the datatype.
*/
TypeFuncClass
get_type_func_class(Oid typid)
{
switch (get_typtype(typid))
{
case 'c':
return TYPEFUNC_COMPOSITE;
case 'b':
case 'd':
return TYPEFUNC_SCALAR;
case 'p':
if (typid == RECORDOID)
return TYPEFUNC_RECORD;
/*
* We treat VOID and CSTRING as legitimate scalar datatypes,
* mostly for the convenience of the JDBC driver (which wants
* to be able to do "SELECT * FROM foo()" for all legitimately
* user-callable functions).
*/
if (typid == VOIDOID || typid == CSTRINGOID)
return TYPEFUNC_SCALAR;
return TYPEFUNC_OTHER;
}
/* shouldn't get here, probably */
return TYPEFUNC_OTHER;
}
/*
* get_typ_typrelid
*
* Given the type OID, get the typrelid (InvalidOid if not a complex
* type).
*/
Oid
get_typ_typrelid(Oid typid)
{
HeapTuple tp;
tp = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_type typtup = (Form_pg_type) GETSTRUCT(tp);
Oid result;
result = typtup->typrelid;
ReleaseSysCache(tp);
return result;
}
else
return InvalidOid;
}
/*
* get_element_type
*
* Given the type OID, get the typelem (InvalidOid if not an array type).
*
* NB: this only considers varlena arrays to be true arrays; InvalidOid is
* returned if the input is a fixed-length array type.
*/
Oid
get_element_type(Oid typid)
{
HeapTuple tp;
tp = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_type typtup = (Form_pg_type) GETSTRUCT(tp);
Oid result;
if (typtup->typlen == -1)
result = typtup->typelem;
else
result = InvalidOid;
ReleaseSysCache(tp);
return result;
}
else
return InvalidOid;
}
/*
* get_array_type
*
* Given the type OID, get the corresponding array type.
* Returns InvalidOid if no array type can be found.
*
* NB: this only considers varlena arrays to be true arrays.
*/
Oid
get_array_type(Oid typid)
{
HeapTuple tp;
tp = SearchSysCache(TYPEOID,
ObjectIdGetDatum(typid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_type typtup = (Form_pg_type) GETSTRUCT(tp);
char *array_typename;
Oid namespaceId;
array_typename = makeArrayTypeName(NameStr(typtup->typname));
namespaceId = typtup->typnamespace;
ReleaseSysCache(tp);
tp = SearchSysCache(TYPENAMENSP,
PointerGetDatum(array_typename),
ObjectIdGetDatum(namespaceId),
0, 0);
pfree(array_typename);
if (HeapTupleIsValid(tp))
{
Oid result;
typtup = (Form_pg_type) GETSTRUCT(tp);
if (typtup->typlen == -1 && typtup->typelem == typid)
result = HeapTupleGetOid(tp);
else
result = InvalidOid;
ReleaseSysCache(tp);
return result;
}
}
return InvalidOid;
}
/*
* getTypeInputInfo
*
* Get info needed for converting values of a type to internal form
*/
void
getTypeInputInfo(Oid type, Oid *typInput, Oid *typIOParam)
{
HeapTuple typeTuple;
Form_pg_type pt;
typeTuple = SearchSysCache(TYPEOID,
ObjectIdGetDatum(type),
0, 0, 0);
if (!HeapTupleIsValid(typeTuple))
elog(ERROR, "cache lookup failed for type %u", type);
pt = (Form_pg_type) GETSTRUCT(typeTuple);
if (!pt->typisdefined)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("type %s is only a shell",
format_type_be(type))));
if (!OidIsValid(pt->typinput))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_FUNCTION),
errmsg("no input function available for type %s",
format_type_be(type))));
*typInput = pt->typinput;
*typIOParam = getTypeIOParam(typeTuple);
ReleaseSysCache(typeTuple);
}
/*
* getTypeOutputInfo
*
* Get info needed for printing values of a type
*/
void
getTypeOutputInfo(Oid type, Oid *typOutput, Oid *typIOParam,
bool *typIsVarlena)
{
HeapTuple typeTuple;
Form_pg_type pt;
typeTuple = SearchSysCache(TYPEOID,
ObjectIdGetDatum(type),
0, 0, 0);
if (!HeapTupleIsValid(typeTuple))
elog(ERROR, "cache lookup failed for type %u", type);
pt = (Form_pg_type) GETSTRUCT(typeTuple);
if (!pt->typisdefined)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("type %s is only a shell",
format_type_be(type))));
if (!OidIsValid(pt->typoutput))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_FUNCTION),
errmsg("no output function available for type %s",
format_type_be(type))));
*typOutput = pt->typoutput;
*typIOParam = getTypeIOParam(typeTuple);
*typIsVarlena = (!pt->typbyval) && (pt->typlen == -1);
ReleaseSysCache(typeTuple);
}
/*
* getTypeBinaryInputInfo
*
* Get info needed for binary input of values of a type
*/
void
getTypeBinaryInputInfo(Oid type, Oid *typReceive, Oid *typIOParam)
{
HeapTuple typeTuple;
Form_pg_type pt;
typeTuple = SearchSysCache(TYPEOID,
ObjectIdGetDatum(type),
0, 0, 0);
if (!HeapTupleIsValid(typeTuple))
elog(ERROR, "cache lookup failed for type %u", type);
pt = (Form_pg_type) GETSTRUCT(typeTuple);
if (!pt->typisdefined)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("type %s is only a shell",
format_type_be(type))));
if (!OidIsValid(pt->typreceive))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_FUNCTION),
errmsg("no binary input function available for type %s",
format_type_be(type))));
*typReceive = pt->typreceive;
*typIOParam = getTypeIOParam(typeTuple);
ReleaseSysCache(typeTuple);
}
/*
* getTypeBinaryOutputInfo
*
* Get info needed for binary output of values of a type
*/
void
getTypeBinaryOutputInfo(Oid type, Oid *typSend, Oid *typIOParam,
bool *typIsVarlena)
{
HeapTuple typeTuple;
Form_pg_type pt;
typeTuple = SearchSysCache(TYPEOID,
ObjectIdGetDatum(type),
0, 0, 0);
if (!HeapTupleIsValid(typeTuple))
elog(ERROR, "cache lookup failed for type %u", type);
pt = (Form_pg_type) GETSTRUCT(typeTuple);
if (!pt->typisdefined)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("type %s is only a shell",
format_type_be(type))));
if (!OidIsValid(pt->typsend))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_FUNCTION),
errmsg("no binary output function available for type %s",
format_type_be(type))));
*typSend = pt->typsend;
*typIOParam = getTypeIOParam(typeTuple);
*typIsVarlena = (!pt->typbyval) && (pt->typlen == -1);
ReleaseSysCache(typeTuple);
}
/* ---------- STATISTICS CACHE ---------- */
/*
* get_attavgwidth
*
* 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;
ReleaseSysCache(tp);
if (stawidth > 0)
return stawidth;
}
return 0;
}
/*
* get_attstatsslot
*
* Extract the contents of a "slot" of a pg_statistic tuple.
* Returns TRUE if requested slot type was found, else FALSE.
*
* Unlike other routines in this file, this takes a pointer to an
* already-looked-up tuple in the pg_statistic cache. We do this since
* most callers will want to extract more than one value from the cache
* entry, and we don't want to repeat the cache lookup unnecessarily.
*
* statstuple: pg_statistics tuple to be examined.
* atttype: type OID of attribute.
* atttypmod: typmod of attribute.
* reqkind: STAKIND code for desired statistics slot kind.
* reqop: STAOP value wanted, or InvalidOid if don't care.
* values, nvalues: if not NULL, the slot's stavalues are extracted.
* numbers, nnumbers: if not NULL, the slot's stanumbers are extracted.
*
* If assigned, values and numbers are set to point to palloc'd arrays.
* If the attribute type is pass-by-reference, the values referenced by
* the values array are themselves palloc'd. The palloc'd stuff can be
* freed by calling free_attstatsslot.
*/
bool
get_attstatsslot(HeapTuple statstuple,
Oid atttype, int32 atttypmod,
int reqkind, Oid reqop,
Datum **values, int *nvalues,
float4 **numbers, int *nnumbers)
{
Form_pg_statistic stats = (Form_pg_statistic) GETSTRUCT(statstuple);
int i,
j;
Datum val;
bool isnull;
ArrayType *statarray;
int narrayelem;
HeapTuple typeTuple;
Form_pg_type typeForm;
for (i = 0; i < STATISTIC_NUM_SLOTS; i++)
{
if ((&stats->stakind1)[i] == reqkind &&
(reqop == InvalidOid || (&stats->staop1)[i] == reqop))
break;
}
if (i >= STATISTIC_NUM_SLOTS)
return false; /* not there */
if (values)
{
val = SysCacheGetAttr(STATRELATT, statstuple,
Anum_pg_statistic_stavalues1 + i,
&isnull);
if (isnull)
elog(ERROR, "stavalues is null");
statarray = DatumGetArrayTypeP(val);
/* Need to get info about the array element type */
typeTuple = SearchSysCache(TYPEOID,
ObjectIdGetDatum(atttype),
0, 0, 0);
if (!HeapTupleIsValid(typeTuple))
elog(ERROR, "cache lookup failed for type %u", atttype);
typeForm = (Form_pg_type) GETSTRUCT(typeTuple);
/* Deconstruct array into Datum elements */
deconstruct_array(statarray,
atttype,
typeForm->typlen,
typeForm->typbyval,
typeForm->typalign,
values, nvalues);
/*
* If the element type is pass-by-reference, we now have a bunch
* of Datums that are pointers into the syscache value. Copy them
* to avoid problems if syscache decides to drop the entry.
*/
if (!typeForm->typbyval)
{
for (j = 0; j < *nvalues; j++)
{
(*values)[j] = datumCopy((*values)[j],
typeForm->typbyval,
typeForm->typlen);
}
}
ReleaseSysCache(typeTuple);
/*
* Free statarray if it's a detoasted copy.
*/
if ((Pointer) statarray != DatumGetPointer(val))
pfree(statarray);
}
if (numbers)
{
val = SysCacheGetAttr(STATRELATT, statstuple,
Anum_pg_statistic_stanumbers1 + i,
&isnull);
if (isnull)
elog(ERROR, "stanumbers is null");
statarray = DatumGetArrayTypeP(val);
/*
* We expect the array to be a 1-D float4 array; verify that. We
* don't need to use deconstruct_array() since the array data is
* just going to look like a C array of float4 values.
*/
narrayelem = ARR_DIMS(statarray)[0];
if (ARR_NDIM(statarray) != 1 || narrayelem <= 0 ||
ARR_ELEMTYPE(statarray) != FLOAT4OID)
elog(ERROR, "stanumbers is not a 1-D float4 array");
*numbers = (float4 *) palloc(narrayelem * sizeof(float4));
memcpy(*numbers, ARR_DATA_PTR(statarray), narrayelem * sizeof(float4));
*nnumbers = narrayelem;
/*
* Free statarray if it's a detoasted copy.
*/
if ((Pointer) statarray != DatumGetPointer(val))
pfree(statarray);
}
return true;
}
void
free_attstatsslot(Oid atttype,
Datum *values, int nvalues,
float4 *numbers, int nnumbers)
{
if (values)
{
if (!get_typbyval(atttype))
{
int i;
for (i = 0; i < nvalues; i++)
pfree(DatumGetPointer(values[i]));
}
pfree(values);
}
if (numbers)
pfree(numbers);
}
/* ---------- PG_NAMESPACE CACHE ---------- */
/*
* get_namespace_name
* Returns the name of a given namespace
*
* Returns a palloc'd copy of the string, or NULL if no such namespace.
*/
char *
get_namespace_name(Oid nspid)
{
HeapTuple tp;
tp = SearchSysCache(NAMESPACEOID,
ObjectIdGetDatum(nspid),
0, 0, 0);
if (HeapTupleIsValid(tp))
{
Form_pg_namespace nsptup = (Form_pg_namespace) GETSTRUCT(tp);
char *result;
result = pstrdup(NameStr(nsptup->nspname));
ReleaseSysCache(tp);
return result;
}
else
return NULL;
}
/* ---------- PG_SHADOW CACHE ---------- */
/*
* get_usesysid
*
* Given a user name, look up the user's sysid.
* Raises an error if no such user (rather than returning zero,
* which might possibly be a valid usesysid).
*
* Note: the type of usesysid is currently int4, but may change to Oid
* someday. It'd be reasonable to return zero on failure if we were
* using Oid ...
*/
AclId
get_usesysid(const char *username)
{
AclId userId;
HeapTuple userTup;
userTup = SearchSysCache(SHADOWNAME,
PointerGetDatum(username),
0, 0, 0);
if (!HeapTupleIsValid(userTup))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("user \"%s\" does not exist", username)));
userId = ((Form_pg_shadow) GETSTRUCT(userTup))->usesysid;
ReleaseSysCache(userTup);
return userId;
}
/*
* get_grosysid
*
* Given a group name, look up the group's sysid.
* Raises an error if no such group (rather than returning zero,
* which might possibly be a valid grosysid).
*
*/
AclId
get_grosysid(char *groname)
{
AclId groupId;
HeapTuple groupTup;
groupTup = SearchSysCache(GRONAME,
PointerGetDatum(groname),
0, 0, 0);
if (!HeapTupleIsValid(groupTup))
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("group \"%s\" does not exist", groname)));
groupId = ((Form_pg_group) GETSTRUCT(groupTup))->grosysid;
ReleaseSysCache(groupTup);
return groupId;
}
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