src/backend/access/gist/gistvalidate.c - cloudberry - Git at Google

 /*-------------------------------------------------------------------------
  *
  * gistvalidate.c
  *	  Opclass validator for GiST.
  *
  * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
  *	  src/backend/access/gist/gistvalidate.c
  *
  *-------------------------------------------------------------------------
  */
 #include "postgres.h"

 #include "access/amvalidate.h"
 #include "access/gist_private.h"
 #include "access/htup_details.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/lsyscache.h"
 #include "utils/regproc.h"
 #include "utils/syscache.h"


 /*
  * Validator for a GiST opclass.
  */
 bool
 gistvalidate(Oid opclassoid)
 {
 	bool		result = true;
 	HeapTuple	classtup;
 	Form_pg_opclass classform;
 	Oid			opfamilyoid;
 	Oid			opcintype;
 	Oid			opckeytype;
 	char	   *opclassname;
 	HeapTuple	familytup;
 	Form_pg_opfamily familyform;
 	char	   *opfamilyname;
 	CatCList   *proclist,
 			   *oprlist;
 	List	   *grouplist;
 	OpFamilyOpFuncGroup *opclassgroup;
 	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;
 	opckeytype = classform->opckeytype;
 	if (!OidIsValid(opckeytype))
 		opckeytype = 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;

 		/*
 		 * All GiST support functions should be registered with matching
 		 * left/right types
 		 */
 		if (procform->amproclefttype != procform->amprocrighttype)
 		{
 			ereport(INFO,
 					(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 					 errmsg("operator family \"%s\" of access method %s contains support function %s with different left and right input types",
 							opfamilyname, "gist",
 							format_procedure(procform->amproc))));
 			result = false;
 		}

 		/*
 		 * We can't check signatures except within the specific opclass, since
 		 * we need to know the associated opckeytype in many cases.
 		 */
 		if (procform->amproclefttype != opcintype)
 			continue;

 		/* Check procedure numbers and function signatures */
 		switch (procform->amprocnum)
 		{
 			case GIST_CONSISTENT_PROC:
 				ok = check_amproc_signature(procform->amproc, BOOLOID, false,
 											5, 5, INTERNALOID, opcintype,
 											INT2OID, OIDOID, INTERNALOID);
 				break;
 			case GIST_UNION_PROC:
 				ok = check_amproc_signature(procform->amproc, opckeytype, false,
 											2, 2, INTERNALOID, INTERNALOID);
 				break;
 			case GIST_COMPRESS_PROC:
 			case GIST_DECOMPRESS_PROC:
 			case GIST_FETCH_PROC:
 				ok = check_amproc_signature(procform->amproc, INTERNALOID, true,
 											1, 1, INTERNALOID);
 				break;
 			case GIST_PENALTY_PROC:
 				ok = check_amproc_signature(procform->amproc, INTERNALOID, true,
 											3, 3, INTERNALOID,
 											INTERNALOID, INTERNALOID);
 				break;
 			case GIST_PICKSPLIT_PROC:
 				ok = check_amproc_signature(procform->amproc, INTERNALOID, true,
 											2, 2, INTERNALOID, INTERNALOID);
 				break;
 			case GIST_EQUAL_PROC:
 				ok = check_amproc_signature(procform->amproc, INTERNALOID, false,
 											3, 3, opckeytype, opckeytype,
 											INTERNALOID);
 				break;
 			case GIST_DISTANCE_PROC:
 				ok = check_amproc_signature(procform->amproc, FLOAT8OID, false,
 											5, 5, INTERNALOID, opcintype,
 											INT2OID, OIDOID, INTERNALOID);
 				break;
 			case GIST_OPTIONS_PROC:
 				ok = check_amoptsproc_signature(procform->amproc);
 				break;
 			case GIST_SORTSUPPORT_PROC:
 				ok = check_amproc_signature(procform->amproc, VOIDOID, true,
 											1, 1, INTERNALOID);
 				break;
 			default:
 				ereport(INFO,
 						(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 						 errmsg("operator family \"%s\" of access method %s contains function %s with invalid support number %d",
 								opfamilyname, "gist",
 								format_procedure(procform->amproc),
 								procform->amprocnum)));
 				result = false;
 				continue;		/* don't want additional message */
 		}

 		if (!ok)
 		{
 			ereport(INFO,
 					(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 					 errmsg("operator family \"%s\" of access method %s contains function %s with wrong signature for support number %d",
 							opfamilyname, "gist",
 							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);
 		Oid			op_rettype;

 		/* TODO: Check that only allowed strategy numbers exist */
 		if (oprform->amopstrategy < 1)
 		{
 			ereport(INFO,
 					(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 					 errmsg("operator family \"%s\" of access method %s contains operator %s with invalid strategy number %d",
 							opfamilyname, "gist",
 							format_operator(oprform->amopopr),
 							oprform->amopstrategy)));
 			result = false;
 		}

 		/* GiST supports ORDER BY operators */
 		if (oprform->amoppurpose != AMOP_SEARCH)
 		{
 			/* ... but must have matching distance proc */
 			if (!OidIsValid(get_opfamily_proc(opfamilyoid,
 											  oprform->amoplefttype,
 											  oprform->amoplefttype,
 											  GIST_DISTANCE_PROC)))
 			{
 				ereport(INFO,
 						(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 						 errmsg("operator family \"%s\" of access method %s contains unsupported ORDER BY specification for operator %s",
 								opfamilyname, "gist",
 								format_operator(oprform->amopopr))));
 				result = false;
 			}
 			/* ... and operator result must match the claimed btree opfamily */
 			op_rettype = get_op_rettype(oprform->amopopr);
 			if (!opfamily_can_sort_type(oprform->amopsortfamily, op_rettype))
 			{
 				ereport(INFO,
 						(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 						 errmsg("operator family \"%s\" of access method %s contains incorrect ORDER BY opfamily specification for operator %s",
 								opfamilyname, "gist",
 								format_operator(oprform->amopopr))));
 				result = false;
 			}
 		}
 		else
 		{
 			/* Search operators must always return bool */
 			op_rettype = BOOLOID;
 		}

 		/* Check operator signature */
 		if (!check_amop_signature(oprform->amopopr, op_rettype,
 								  oprform->amoplefttype,
 								  oprform->amoprighttype))
 		{
 			ereport(INFO,
 					(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 					 errmsg("operator family \"%s\" of access method %s contains operator %s with wrong signature",
 							opfamilyname, "gist",
 							format_operator(oprform->amopopr))));
 			result = false;
 		}
 	}

 	/* Now check for inconsistent groups of operators/functions */
 	grouplist = identify_opfamily_groups(oprlist, proclist);
 	opclassgroup = NULL;
 	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;

 		/*
 		 * There is not a lot we can do to check the operator sets, since each
 		 * GiST opclass is more or less a law unto itself, and some contain
 		 * only operators that are binary-compatible with the opclass datatype
 		 * (meaning that empty operator sets can be OK).  That case also means
 		 * that we shouldn't insist on nonempty function sets except for the
 		 * opclass's own group.
 		 */
 	}

 	/* Check that the originally-named opclass is complete */
 	for (i = 1; i <= GISTNProcs; i++)
 	{
 		if (opclassgroup &&
 			(opclassgroup->functionset & (((uint64) 1) << i)) != 0)
 			continue;			/* got it */
 		if (i == GIST_DISTANCE_PROC || i == GIST_FETCH_PROC ||
 			i == GIST_COMPRESS_PROC || i == GIST_DECOMPRESS_PROC ||
 			i == GIST_OPTIONS_PROC || i == GIST_SORTSUPPORT_PROC)
 			continue;			/* optional methods */
 		ereport(INFO,
 				(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 				 errmsg("operator class \"%s\" of access method %s is missing support function %d",
 						opclassname, "gist", i)));
 		result = false;
 	}

 	ReleaseCatCacheList(proclist);
 	ReleaseCatCacheList(oprlist);
 	ReleaseSysCache(familytup);
 	ReleaseSysCache(classtup);

 	return result;
 }

 /*
  * Prechecking function for adding operators/functions to a GiST opfamily.
  */
 void
 gistadjustmembers(Oid opfamilyoid,
 				  Oid opclassoid,
 				  List *operators,
 				  List *functions)
 {
 	ListCell   *lc;

 	/*
 	 * Operator members of a GiST opfamily should never have hard
 	 * dependencies, since their connection to the opfamily depends only on
 	 * what the support functions think, and that can be altered.  For
 	 * consistency, we make all soft dependencies point to the opfamily,
 	 * though a soft dependency on the opclass would work as well in the
 	 * CREATE OPERATOR CLASS case.
 	 */
 	foreach(lc, operators)
 	{
 		OpFamilyMember *op = (OpFamilyMember *) lfirst(lc);

 		op->ref_is_hard = false;
 		op->ref_is_family = true;
 		op->refobjid = opfamilyoid;
 	}

 	/*
 	 * Required support functions should have hard dependencies.  Preferably
 	 * those are just dependencies on the opclass, but if we're in ALTER
 	 * OPERATOR FAMILY, we leave the dependency pointing at the whole
 	 * opfamily.  (Given that GiST opclasses generally don't share opfamilies,
 	 * it seems unlikely to be worth working harder.)
 	 */
 	foreach(lc, functions)
 	{
 		OpFamilyMember *op = (OpFamilyMember *) lfirst(lc);

 		switch (op->number)
 		{
 			case GIST_CONSISTENT_PROC:
 			case GIST_UNION_PROC:
 			case GIST_PENALTY_PROC:
 			case GIST_PICKSPLIT_PROC:
 			case GIST_EQUAL_PROC:
 				/* Required support function */
 				op->ref_is_hard = true;
 				break;
 			case GIST_COMPRESS_PROC:
 			case GIST_DECOMPRESS_PROC:
 			case GIST_DISTANCE_PROC:
 			case GIST_FETCH_PROC:
 			case GIST_OPTIONS_PROC:
 			case GIST_SORTSUPPORT_PROC:
 				/* Optional, so force it to be a soft family dependency */
 				op->ref_is_hard = false;
 				op->ref_is_family = true;
 				op->refobjid = opfamilyoid;
 				break;
 			default:
 				ereport(ERROR,
 						(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
 						 errmsg("support function number %d is invalid for access method %s",
 								op->number, "gist")));
 				break;
 		}
 	}
 }
	/*-------------------------------------------------------------------------
	*
	* gistvalidate.c
	* Opclass validator for GiST.
	*
	* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
	* Portions Copyright (c) 1994, Regents of the University of California
	*
	* IDENTIFICATION
	* src/backend/access/gist/gistvalidate.c
	*
	*-------------------------------------------------------------------------
	*/
	#include "postgres.h"

	#include "access/amvalidate.h"
	#include "access/gist_private.h"
	#include "access/htup_details.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/lsyscache.h"
	#include "utils/regproc.h"
	#include "utils/syscache.h"


	/*
	* Validator for a GiST opclass.
	*/
	bool
	gistvalidate(Oid opclassoid)
	{
	bool result = true;
	HeapTuple classtup;
	Form_pg_opclass classform;
	Oid opfamilyoid;
	Oid opcintype;
	Oid opckeytype;
	char *opclassname;
	HeapTuple familytup;
	Form_pg_opfamily familyform;
	char *opfamilyname;
	CatCList *proclist,
	*oprlist;
	List *grouplist;
	OpFamilyOpFuncGroup *opclassgroup;
	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;
	opckeytype = classform->opckeytype;
	if (!OidIsValid(opckeytype))
	opckeytype = 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;

	/*
	* All GiST support functions should be registered with matching
	* left/right types
	*/
	if (procform->amproclefttype != procform->amprocrighttype)
	{
	ereport(INFO,
	(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
	errmsg("operator family \"%s\" of access method %s contains support function %s with different left and right input types",
	opfamilyname, "gist",
	format_procedure(procform->amproc))));
	result = false;
	}

	/*
	* We can't check signatures except within the specific opclass, since
	* we need to know the associated opckeytype in many cases.
	*/
	if (procform->amproclefttype != opcintype)
	continue;

	/* Check procedure numbers and function signatures */
	switch (procform->amprocnum)
	{
	case GIST_CONSISTENT_PROC:
	ok = check_amproc_signature(procform->amproc, BOOLOID, false,
	5, 5, INTERNALOID, opcintype,
	INT2OID, OIDOID, INTERNALOID);
	break;
	case GIST_UNION_PROC:
	ok = check_amproc_signature(procform->amproc, opckeytype, false,
	2, 2, INTERNALOID, INTERNALOID);
	break;
	case GIST_COMPRESS_PROC:
	case GIST_DECOMPRESS_PROC:
	case GIST_FETCH_PROC:
	ok = check_amproc_signature(procform->amproc, INTERNALOID, true,
	1, 1, INTERNALOID);
	break;
	case GIST_PENALTY_PROC:
	ok = check_amproc_signature(procform->amproc, INTERNALOID, true,
	3, 3, INTERNALOID,
	INTERNALOID, INTERNALOID);
	break;
	case GIST_PICKSPLIT_PROC:
	ok = check_amproc_signature(procform->amproc, INTERNALOID, true,
	2, 2, INTERNALOID, INTERNALOID);
	break;
	case GIST_EQUAL_PROC:
	ok = check_amproc_signature(procform->amproc, INTERNALOID, false,
	3, 3, opckeytype, opckeytype,
	INTERNALOID);
	break;
	case GIST_DISTANCE_PROC:
	ok = check_amproc_signature(procform->amproc, FLOAT8OID, false,
	5, 5, INTERNALOID, opcintype,
	INT2OID, OIDOID, INTERNALOID);
	break;
	case GIST_OPTIONS_PROC:
	ok = check_amoptsproc_signature(procform->amproc);
	break;
	case GIST_SORTSUPPORT_PROC:
	ok = check_amproc_signature(procform->amproc, VOIDOID, true,
	1, 1, INTERNALOID);
	break;
	default:
	ereport(INFO,
	(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
	errmsg("operator family \"%s\" of access method %s contains function %s with invalid support number %d",
	opfamilyname, "gist",
	format_procedure(procform->amproc),
	procform->amprocnum)));
	result = false;
	continue; /* don't want additional message */
	}

	if (!ok)
	{
	ereport(INFO,
	(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
	errmsg("operator family \"%s\" of access method %s contains function %s with wrong signature for support number %d",
	opfamilyname, "gist",
	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);
	Oid op_rettype;

	/* TODO: Check that only allowed strategy numbers exist */
	if (oprform->amopstrategy < 1)
	{
	ereport(INFO,
	(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
	errmsg("operator family \"%s\" of access method %s contains operator %s with invalid strategy number %d",
	opfamilyname, "gist",
	format_operator(oprform->amopopr),
	oprform->amopstrategy)));
	result = false;
	}

	/* GiST supports ORDER BY operators */
	if (oprform->amoppurpose != AMOP_SEARCH)
	{
	/* ... but must have matching distance proc */
	if (!OidIsValid(get_opfamily_proc(opfamilyoid,
	oprform->amoplefttype,
	oprform->amoplefttype,
	GIST_DISTANCE_PROC)))
	{
	ereport(INFO,
	(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
	errmsg("operator family \"%s\" of access method %s contains unsupported ORDER BY specification for operator %s",
	opfamilyname, "gist",
	format_operator(oprform->amopopr))));
	result = false;
	}
	/* ... and operator result must match the claimed btree opfamily */
	op_rettype = get_op_rettype(oprform->amopopr);
	if (!opfamily_can_sort_type(oprform->amopsortfamily, op_rettype))
	{
	ereport(INFO,
	(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
	errmsg("operator family \"%s\" of access method %s contains incorrect ORDER BY opfamily specification for operator %s",
	opfamilyname, "gist",
	format_operator(oprform->amopopr))));
	result = false;
	}
	}
	else
	{
	/* Search operators must always return bool */
	op_rettype = BOOLOID;
	}

	/* Check operator signature */
	if (!check_amop_signature(oprform->amopopr, op_rettype,
	oprform->amoplefttype,
	oprform->amoprighttype))
	{
	ereport(INFO,
	(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
	errmsg("operator family \"%s\" of access method %s contains operator %s with wrong signature",
	opfamilyname, "gist",
	format_operator(oprform->amopopr))));
	result = false;
	}
	}

	/* Now check for inconsistent groups of operators/functions */
	grouplist = identify_opfamily_groups(oprlist, proclist);
	opclassgroup = NULL;
	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;

	/*
	* There is not a lot we can do to check the operator sets, since each
	* GiST opclass is more or less a law unto itself, and some contain
	* only operators that are binary-compatible with the opclass datatype
	* (meaning that empty operator sets can be OK). That case also means
	* that we shouldn't insist on nonempty function sets except for the
	* opclass's own group.
	*/
	}

	/* Check that the originally-named opclass is complete */
	for (i = 1; i <= GISTNProcs; i++)
	{
	if (opclassgroup &&
	(opclassgroup->functionset & (((uint64) 1) << i)) != 0)
	continue; /* got it */
	if (i == GIST_DISTANCE_PROC \|\| i == GIST_FETCH_PROC \|\|
	i == GIST_COMPRESS_PROC \|\| i == GIST_DECOMPRESS_PROC \|\|
	i == GIST_OPTIONS_PROC \|\| i == GIST_SORTSUPPORT_PROC)
	continue; /* optional methods */
	ereport(INFO,
	(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
	errmsg("operator class \"%s\" of access method %s is missing support function %d",
	opclassname, "gist", i)));
	result = false;
	}

	ReleaseCatCacheList(proclist);
	ReleaseCatCacheList(oprlist);
	ReleaseSysCache(familytup);
	ReleaseSysCache(classtup);

	return result;
	}

	/*
	* Prechecking function for adding operators/functions to a GiST opfamily.
	*/
	void
	gistadjustmembers(Oid opfamilyoid,
	Oid opclassoid,
	List *operators,
	List *functions)
	{
	ListCell *lc;

	/*
	* Operator members of a GiST opfamily should never have hard
	* dependencies, since their connection to the opfamily depends only on
	* what the support functions think, and that can be altered. For
	* consistency, we make all soft dependencies point to the opfamily,
	* though a soft dependency on the opclass would work as well in the
	* CREATE OPERATOR CLASS case.
	*/
	foreach(lc, operators)
	{
	OpFamilyMember op = (OpFamilyMember ) lfirst(lc);

	op->ref_is_hard = false;
	op->ref_is_family = true;
	op->refobjid = opfamilyoid;
	}

	/*
	* Required support functions should have hard dependencies. Preferably
	* those are just dependencies on the opclass, but if we're in ALTER
	* OPERATOR FAMILY, we leave the dependency pointing at the whole
	* opfamily. (Given that GiST opclasses generally don't share opfamilies,
	* it seems unlikely to be worth working harder.)
	*/
	foreach(lc, functions)
	{
	OpFamilyMember op = (OpFamilyMember ) lfirst(lc);

	switch (op->number)
	{
	case GIST_CONSISTENT_PROC:
	case GIST_UNION_PROC:
	case GIST_PENALTY_PROC:
	case GIST_PICKSPLIT_PROC:
	case GIST_EQUAL_PROC:
	/* Required support function */
	op->ref_is_hard = true;
	break;
	case GIST_COMPRESS_PROC:
	case GIST_DECOMPRESS_PROC:
	case GIST_DISTANCE_PROC:
	case GIST_FETCH_PROC:
	case GIST_OPTIONS_PROC:
	case GIST_SORTSUPPORT_PROC:
	/* Optional, so force it to be a soft family dependency */
	op->ref_is_hard = false;
	op->ref_is_family = true;
	op->refobjid = opfamilyoid;
	break;
	default:
	ereport(ERROR,
	(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
	errmsg("support function number %d is invalid for access method %s",
	op->number, "gist")));
	break;
	}
	}
	}