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/*-------------------------------------------------------------------------
* relation_stats.c
*
* PostgreSQL relation statistics manipulation
*
* Code supporting the direct import of relation statistics, similar to
* what is done by the ANALYZE command.
*
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/backend/statistics/relation_stats.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/heapam.h"
#include "catalog/indexing.h"
#include "catalog/namespace.h"
#include "statistics/stat_utils.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/fmgrprotos.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
/*
* Positional argument numbers, names, and types for
* relation_statistics_update().
*/
enum relation_stats_argnum
{
RELSCHEMA_ARG = 0,
RELNAME_ARG,
RELPAGES_ARG,
RELTUPLES_ARG,
RELALLVISIBLE_ARG,
RELALLFROZEN_ARG,
NUM_RELATION_STATS_ARGS
};
static struct StatsArgInfo relarginfo[] =
{
[RELSCHEMA_ARG] = {"schemaname", TEXTOID},
[RELNAME_ARG] = {"relname", TEXTOID},
[RELPAGES_ARG] = {"relpages", INT4OID},
[RELTUPLES_ARG] = {"reltuples", FLOAT4OID},
[RELALLVISIBLE_ARG] = {"relallvisible", INT4OID},
[RELALLFROZEN_ARG] = {"relallfrozen", INT4OID},
[NUM_RELATION_STATS_ARGS] = {0}
};
static bool relation_statistics_update(FunctionCallInfo fcinfo);
/*
* Internal function for modifying statistics for a relation.
*/
static bool
relation_statistics_update(FunctionCallInfo fcinfo)
{
bool result = true;
char *nspname;
char *relname;
Oid reloid;
Relation crel;
BlockNumber relpages = 0;
bool update_relpages = false;
float reltuples = 0;
bool update_reltuples = false;
BlockNumber relallvisible = 0;
bool update_relallvisible = false;
BlockNumber relallfrozen = 0;
bool update_relallfrozen = false;
HeapTuple ctup;
Form_pg_class pgcform;
int replaces[4] = {0};
Datum values[4] = {0};
bool nulls[4] = {0};
int nreplaces = 0;
stats_check_required_arg(fcinfo, relarginfo, RELSCHEMA_ARG);
stats_check_required_arg(fcinfo, relarginfo, RELNAME_ARG);
nspname = TextDatumGetCString(PG_GETARG_DATUM(RELSCHEMA_ARG));
relname = TextDatumGetCString(PG_GETARG_DATUM(RELNAME_ARG));
reloid = stats_lookup_relid(nspname, relname);
if (RecoveryInProgress())
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("recovery is in progress"),
errhint("Statistics cannot be modified during recovery.")));
stats_lock_check_privileges(reloid);
if (!PG_ARGISNULL(RELPAGES_ARG))
{
relpages = PG_GETARG_UINT32(RELPAGES_ARG);
update_relpages = true;
}
if (!PG_ARGISNULL(RELTUPLES_ARG))
{
reltuples = PG_GETARG_FLOAT4(RELTUPLES_ARG);
if (reltuples < -1.0)
{
ereport(WARNING,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("reltuples cannot be < -1.0")));
result = false;
}
else
update_reltuples = true;
}
if (!PG_ARGISNULL(RELALLVISIBLE_ARG))
{
relallvisible = PG_GETARG_UINT32(RELALLVISIBLE_ARG);
update_relallvisible = true;
}
if (!PG_ARGISNULL(RELALLFROZEN_ARG))
{
relallfrozen = PG_GETARG_UINT32(RELALLFROZEN_ARG);
update_relallfrozen = true;
}
/*
* Take RowExclusiveLock on pg_class, consistent with
* vac_update_relstats().
*/
crel = table_open(RelationRelationId, RowExclusiveLock);
ctup = SearchSysCache1(RELOID, ObjectIdGetDatum(reloid));
if (!HeapTupleIsValid(ctup))
elog(ERROR, "pg_class entry for relid %u not found", reloid);
pgcform = (Form_pg_class) GETSTRUCT(ctup);
if (update_relpages && relpages != pgcform->relpages)
{
replaces[nreplaces] = Anum_pg_class_relpages;
values[nreplaces] = UInt32GetDatum(relpages);
nreplaces++;
}
if (update_reltuples && reltuples != pgcform->reltuples)
{
replaces[nreplaces] = Anum_pg_class_reltuples;
values[nreplaces] = Float4GetDatum(reltuples);
nreplaces++;
}
if (update_relallvisible && relallvisible != pgcform->relallvisible)
{
replaces[nreplaces] = Anum_pg_class_relallvisible;
values[nreplaces] = UInt32GetDatum(relallvisible);
nreplaces++;
}
if (update_relallfrozen && relallfrozen != pgcform->relallfrozen)
{
replaces[nreplaces] = Anum_pg_class_relallfrozen;
values[nreplaces] = UInt32GetDatum(relallfrozen);
nreplaces++;
}
if (nreplaces > 0)
{
TupleDesc tupdesc = RelationGetDescr(crel);
HeapTuple newtup;
newtup = heap_modify_tuple_by_cols(ctup, tupdesc, nreplaces,
replaces, values, nulls);
CatalogTupleUpdate(crel, &newtup->t_self, newtup);
heap_freetuple(newtup);
}
ReleaseSysCache(ctup);
/* release the lock, consistent with vac_update_relstats() */
table_close(crel, RowExclusiveLock);
CommandCounterIncrement();
return result;
}
/*
* Clear statistics for a given pg_class entry; that is, set back to initial
* stats for a newly-created table.
*/
Datum
pg_clear_relation_stats(PG_FUNCTION_ARGS)
{
LOCAL_FCINFO(newfcinfo, 6);
InitFunctionCallInfoData(*newfcinfo, NULL, 6, InvalidOid, NULL, NULL);
newfcinfo->args[0].value = PG_GETARG_DATUM(0);
newfcinfo->args[0].isnull = PG_ARGISNULL(0);
newfcinfo->args[1].value = PG_GETARG_DATUM(1);
newfcinfo->args[1].isnull = PG_ARGISNULL(1);
newfcinfo->args[2].value = UInt32GetDatum(0);
newfcinfo->args[2].isnull = false;
newfcinfo->args[3].value = Float4GetDatum(-1.0);
newfcinfo->args[3].isnull = false;
newfcinfo->args[4].value = UInt32GetDatum(0);
newfcinfo->args[4].isnull = false;
newfcinfo->args[5].value = UInt32GetDatum(0);
newfcinfo->args[5].isnull = false;
relation_statistics_update(newfcinfo);
PG_RETURN_VOID();
}
Datum
pg_restore_relation_stats(PG_FUNCTION_ARGS)
{
LOCAL_FCINFO(positional_fcinfo, NUM_RELATION_STATS_ARGS);
bool result = true;
InitFunctionCallInfoData(*positional_fcinfo, NULL,
NUM_RELATION_STATS_ARGS,
InvalidOid, NULL, NULL);
if (!stats_fill_fcinfo_from_arg_pairs(fcinfo, positional_fcinfo,
relarginfo))
result = false;
if (!relation_statistics_update(positional_fcinfo))
result = false;
PG_RETURN_BOOL(result);
}
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