spgvalidate.c

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/*-------------------------------------------------------------------------
 *
 * spgvalidate.c
 *    Opclass validator for SP-GiST.
 *
 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * IDENTIFICATION
 *          src/backend/access/spgist/spgvalidate.c
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"
 
#include "access/amvalidate.h"
#include "access/htup_details.h"
#include "access/spgist.h"
#include "catalog/pg_amop.h"
#include "catalog/pg_amproc.h"
#include "catalog/pg_opclass.h"
#include "catalog/pg_type.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/regproc.h"
#include "utils/syscache.h"
 
 
/*
 * Validator for an SP-GiST 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
spgvalidate(Oid opclassoid)
{
    bool        result = true;
    HeapTuple   classtup;
    Form_pg_opclass classform;
    Oid         opfamilyoid;
    Oid         opcintype;
    Oid         opckeytype;
    char       *opclassname;
    char       *opfamilyname;
    CatCList   *proclist,
               *oprlist;
    List       *grouplist;
    OpFamilyOpFuncGroup *opclassgroup;
    int         i;
    ListCell   *lc;
    spgConfigIn configIn;
    spgConfigOut configOut;
    Oid         configOutLefttype = InvalidOid;
    Oid         configOutRighttype = InvalidOid;
    Oid         configOutLeafType = InvalidOid;
 
    /* 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;
    opclassname = NameStr(classform->opcname);
 
    /* Fetch opfamily information */
    opfamilyname = get_opfamily_name(opfamilyoid, false);
 
    /* Fetch all operators and support functions of the opfamily */
    oprlist = SearchSysCacheList1(AMOPSTRATEGY, ObjectIdGetDatum(opfamilyoid));
    proclist = SearchSysCacheList1(AMPROCNUM, ObjectIdGetDatum(opfamilyoid));
    grouplist = identify_opfamily_groups(oprlist, proclist);
 
    /* 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 SP-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, "spgist",
                            format_procedure(procform->amproc))));
            result = false;
        }
 
        /* Check procedure numbers and function signatures */
        switch (procform->amprocnum)
        {
            case SPGIST_CONFIG_PROC:
                ok = check_amproc_signature(procform->amproc, VOIDOID, true,
                                            2, 2, INTERNALOID, INTERNALOID);
                configIn.attType = procform->amproclefttype;
                memset(&configOut, 0, sizeof(configOut));
 
                OidFunctionCall2(procform->amproc,
                                 PointerGetDatum(&configIn),
                                 PointerGetDatum(&configOut));
 
                configOutLefttype = procform->amproclefttype;
                configOutRighttype = procform->amprocrighttype;
 
                /* Default leaf type is opckeytype or input type */
                if (OidIsValid(opckeytype))
                    configOutLeafType = opckeytype;
                else
                    configOutLeafType = procform->amproclefttype;
 
                /* If some other leaf datum type is specified, warn */
                if (OidIsValid(configOut.leafType) &&
                    configOutLeafType != configOut.leafType)
                {
                    ereport(INFO,
                            (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
                             errmsg("SP-GiST leaf data type %s does not match declared type %s",
                                    format_type_be(configOut.leafType),
                                    format_type_be(configOutLeafType))));
                    result = false;
                    configOutLeafType = configOut.leafType;
                }
 
                /*
                 * When leaf and attribute types are the same, compress
                 * function is not required and we set corresponding bit in
                 * functionset for later group consistency check.
                 */
                if (configOutLeafType == configIn.attType)
                {
                    foreach(lc, grouplist)
                    {
                        OpFamilyOpFuncGroup *group = lfirst(lc);
 
                        if (group->lefttype == procform->amproclefttype &&
                            group->righttype == procform->amprocrighttype)
                        {
                            group->functionset |=
                                ((uint64) 1) << SPGIST_COMPRESS_PROC;
                            break;
                        }
                    }
                }
                break;
            case SPGIST_CHOOSE_PROC:
            case SPGIST_PICKSPLIT_PROC:
            case SPGIST_INNER_CONSISTENT_PROC:
                ok = check_amproc_signature(procform->amproc, VOIDOID, true,
                                            2, 2, INTERNALOID, INTERNALOID);
                break;
            case SPGIST_LEAF_CONSISTENT_PROC:
                ok = check_amproc_signature(procform->amproc, BOOLOID, true,
                                            2, 2, INTERNALOID, INTERNALOID);
                break;
            case SPGIST_COMPRESS_PROC:
                if (configOutLefttype != procform->amproclefttype ||
                    configOutRighttype != procform->amprocrighttype)
                    ok = false;
                else
                    ok = check_amproc_signature(procform->amproc,
                                                configOutLeafType, true,
                                                1, 1, procform->amproclefttype);
                break;
            case SPGIST_OPTIONS_PROC:
                ok = check_amoptsproc_signature(procform->amproc);
                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, "spgist",
                                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, "spgist",
                            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 || oprform->amopstrategy > 63)
        {
            ereport(INFO,
                    (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
                     errmsg("operator family \"%s\" of access method %s contains operator %s with invalid strategy number %d",
                            opfamilyname, "spgist",
                            format_operator(oprform->amopopr),
                            oprform->amopstrategy)));
            result = false;
        }
 
        /* spgist supports ORDER BY operators */
        if (oprform->amoppurpose != AMOP_SEARCH)
        {
            /* ... 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 invalid ORDER BY specification for operator %s",
                                opfamilyname, "spgist",
                                format_operator(oprform->amopopr))));
                result = false;
            }
        }
        else
            op_rettype = BOOLOID;
 
        /* Check operator signature --- same for all spgist strategies */
        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, "spgist",
                            format_operator(oprform->amopopr))));
            result = false;
        }
    }
 
    /* Now check for inconsistent groups of operators/functions */
    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;
 
        /*
         * Complain if there are any datatype pairs with functions but no
         * operators.  This is about the best we can do for now to detect
         * missing operators.
         */
        if (thisgroup->operatorset == 0)
        {
            ereport(INFO,
                    (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
                     errmsg("operator family \"%s\" of access method %s is missing operator(s) for types %s and %s",
                            opfamilyname, "spgist",
                            format_type_be(thisgroup->lefttype),
                            format_type_be(thisgroup->righttype))));
            result = false;
        }
 
        /*
         * Complain if we're missing functions for any datatype, remembering
         * that SP-GiST doesn't use cross-type support functions.
         */
        if (thisgroup->lefttype != thisgroup->righttype)
            continue;
 
        for (i = 1; i <= SPGISTNProc; i++)
        {
            if ((thisgroup->functionset & (((uint64) 1) << i)) != 0)
                continue;       /* got it */
            if (i == SPGIST_OPTIONS_PROC)
                continue;       /* optional method */
            ereport(INFO,
                    (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
                     errmsg("operator family \"%s\" of access method %s is missing support function %d for type %s",
                            opfamilyname, "spgist", i,
                            format_type_be(thisgroup->lefttype))));
            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("operator class \"%s\" of access method %s is missing operator(s)",
                        opclassname, "spgist")));
        result = false;
    }
 
    ReleaseCatCacheList(proclist);
    ReleaseCatCacheList(oprlist);
    ReleaseSysCache(classtup);
 
    return result;
}
 
/*
 * Prechecking function for adding operators/functions to an SP-GiST opfamily.
 */
void
spgadjustmembers(Oid opfamilyoid,
                 Oid opclassoid,
                 List *operators,
                 List *functions)
{
    ListCell   *lc;
 
    /*
     * Operator members of an SP-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 SP-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 SPGIST_CONFIG_PROC:
            case SPGIST_CHOOSE_PROC:
            case SPGIST_PICKSPLIT_PROC:
            case SPGIST_INNER_CONSISTENT_PROC:
            case SPGIST_LEAF_CONSISTENT_PROC:
                /* Required support function */
                op->ref_is_hard = true;
                break;
            case SPGIST_COMPRESS_PROC:
            case SPGIST_OPTIONS_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, "spgist")));
                break;
        }
    }
}