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/*-------------------------------------------------------------------------
*
* nbtvalidate.c
* Opclass validator for btree.
*
* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/backend/access/nbtree/nbtvalidate.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/amvalidate.h"
#include "access/htup_details.h"
#include "access/nbtree.h"
#include "catalog/pg_amop.h"
#include "catalog/pg_amproc.h"
#include "catalog/pg_opclass.h"
#include "catalog/pg_opfamily.h"
#include "catalog/pg_type.h"
#include "utils/builtins.h"
#include "utils/syscache.h"
/*
* Validator for a btree opclass.
*
* Some of the checks done here cover the whole opfamily, and therefore are
* redundant when checking each opclass in a family. But they don't run long
* enough to be much of a problem, so we accept the duplication rather than
* complicate the amvalidate API.
*/
bool
btvalidate(Oid opclassoid)
{
bool result = true;
HeapTuple classtup;
Form_pg_opclass classform;
Oid opfamilyoid;
Oid opcintype;
char *opclassname;
HeapTuple familytup;
Form_pg_opfamily familyform;
char *opfamilyname;
CatCList *proclist,
*oprlist;
List *grouplist;
OpFamilyOpFuncGroup *opclassgroup;
List *familytypes;
int i;
ListCell *lc;
/* Fetch opclass information */
classtup = SearchSysCache1(CLAOID, ObjectIdGetDatum(opclassoid));
if (!HeapTupleIsValid(classtup))
elog(ERROR, "cache lookup failed for operator class %u", opclassoid);
classform = (Form_pg_opclass) GETSTRUCT(classtup);
opfamilyoid = classform->opcfamily;
opcintype = classform->opcintype;
opclassname = NameStr(classform->opcname);
/* Fetch opfamily information */
familytup = SearchSysCache1(OPFAMILYOID, ObjectIdGetDatum(opfamilyoid));
if (!HeapTupleIsValid(familytup))
elog(ERROR, "cache lookup failed for operator family %u", opfamilyoid);
familyform = (Form_pg_opfamily) GETSTRUCT(familytup);
opfamilyname = NameStr(familyform->opfname);
/* Fetch all operators and support functions of the opfamily */
oprlist = SearchSysCacheList1(AMOPSTRATEGY, ObjectIdGetDatum(opfamilyoid));
proclist = SearchSysCacheList1(AMPROCNUM, ObjectIdGetDatum(opfamilyoid));
/* Check individual support functions */
for (i = 0; i < proclist->n_members; i++)
{
HeapTuple proctup = &proclist->members[i]->tuple;
Form_pg_amproc procform = (Form_pg_amproc) GETSTRUCT(proctup);
bool ok;
/* Check procedure numbers and function signatures */
switch (procform->amprocnum)
{
case BTORDER_PROC:
ok = check_amproc_signature(procform->amproc, INT4OID, true,
2, 2, procform->amproclefttype,
procform->amprocrighttype);
break;
case BTSORTSUPPORT_PROC:
ok = check_amproc_signature(procform->amproc, VOIDOID, true,
1, 1, INTERNALOID);
break;
default:
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("btree operator family \"%s\" contains function %s with invalid support number %d",
opfamilyname,
format_procedure(procform->amproc),
procform->amprocnum)));
result = false;
continue; /* don't want additional message */
}
if (!ok)
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("btree operator family \"%s\" contains function %s with wrong signature for support number %d",
opfamilyname,
format_procedure(procform->amproc),
procform->amprocnum)));
result = false;
}
}
/* Check individual operators */
for (i = 0; i < oprlist->n_members; i++)
{
HeapTuple oprtup = &oprlist->members[i]->tuple;
Form_pg_amop oprform = (Form_pg_amop) GETSTRUCT(oprtup);
/* Check that only allowed strategy numbers exist */
if (oprform->amopstrategy < 1 ||
oprform->amopstrategy > BTMaxStrategyNumber)
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("btree operator family \"%s\" contains operator %s with invalid strategy number %d",
opfamilyname,
format_operator(oprform->amopopr),
oprform->amopstrategy)));
result = false;
}
/* btree doesn't support ORDER BY operators */
if (oprform->amoppurpose != AMOP_SEARCH ||
OidIsValid(oprform->amopsortfamily))
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("btree operator family \"%s\" contains invalid ORDER BY specification for operator %s",
opfamilyname,
format_operator(oprform->amopopr))));
result = false;
}
/* Check operator signature --- same for all btree strategies */
if (!check_amop_signature(oprform->amopopr, BOOLOID,
oprform->amoplefttype,
oprform->amoprighttype))
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("btree operator family \"%s\" contains operator %s with wrong signature",
opfamilyname,
format_operator(oprform->amopopr))));
result = false;
}
}
/* Now check for inconsistent groups of operators/functions */
grouplist = identify_opfamily_groups(oprlist, proclist);
opclassgroup = NULL;
familytypes = NIL;
foreach(lc, grouplist)
{
OpFamilyOpFuncGroup *thisgroup = (OpFamilyOpFuncGroup *) lfirst(lc);
/* Remember the group exactly matching the test opclass */
if (thisgroup->lefttype == opcintype &&
thisgroup->righttype == opcintype)
opclassgroup = thisgroup;
/*
* Identify all distinct data types handled in this opfamily. This
* implementation is O(N^2), but there aren't likely to be enough
* types in the family for it to matter.
*/
familytypes = list_append_unique_oid(familytypes, thisgroup->lefttype);
familytypes = list_append_unique_oid(familytypes, thisgroup->righttype);
/*
* Complain if there seems to be an incomplete set of either operators
* or support functions for this datatype pair. The only thing that
* is considered optional is the sortsupport function.
*/
if (thisgroup->operatorset !=
((1 << BTLessStrategyNumber) |
(1 << BTLessEqualStrategyNumber) |
(1 << BTEqualStrategyNumber) |
(1 << BTGreaterEqualStrategyNumber) |
(1 << BTGreaterStrategyNumber)))
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("btree operator family \"%s\" is missing operator(s) for types %s and %s",
opfamilyname,
format_type_be(thisgroup->lefttype),
format_type_be(thisgroup->righttype))));
result = false;
}
if ((thisgroup->functionset & (1 << BTORDER_PROC)) == 0)
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("btree operator family \"%s\" is missing support function for types %s and %s",
opfamilyname,
format_type_be(thisgroup->lefttype),
format_type_be(thisgroup->righttype))));
result = false;
}
}
/* Check that the originally-named opclass is supported */
/* (if group is there, we already checked it adequately above) */
if (!opclassgroup)
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("btree operator class \"%s\" is missing operator(s)",
opclassname)));
result = false;
}
/*
* Complain if the opfamily doesn't have entries for all possible
* combinations of its supported datatypes. While missing cross-type
* operators are not fatal, they do limit the planner's ability to derive
* additional qual clauses from equivalence classes, so it seems
* reasonable to insist that all built-in btree opfamilies be complete.
*/
if (list_length(grouplist) !=
list_length(familytypes) * list_length(familytypes))
{
ereport(INFO,
(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
errmsg("btree operator family \"%s\" is missing cross-type operator(s)",
opfamilyname)));
result = false;
}
ReleaseCatCacheList(proclist);
ReleaseCatCacheList(oprlist);
ReleaseSysCache(familytup);
ReleaseSysCache(classtup);
return result;
}
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