PostGIS  3.0.0dev-r@@SVN_REVISION@@

◆ pg_get_nd_stats()

static ND_STATS* pg_get_nd_stats ( const Oid  table_oid,
AttrNumber  att_num,
int  mode,
bool  only_parent 
)
static

Pull the stats object from the PgSQL system catalogs.

Used by the selectivity functions and the debugging functions.

Definition at line 945 of file gserialized_estimate.c.

References pg_nd_stats_from_tuple().

Referenced by gserialized_gist_joinsel(), and pg_get_nd_stats_by_name().

946 {
947  HeapTuple stats_tuple = NULL;
948  ND_STATS *nd_stats;
949 
950  /* First pull the stats tuple for the whole tree */
951  if ( ! only_parent )
952  {
953  POSTGIS_DEBUGF(2, "searching whole tree stats for \"%s\"", get_rel_name(table_oid)? get_rel_name(table_oid) : "NULL");
954  stats_tuple = SearchSysCache3(STATRELATTINH, ObjectIdGetDatum(table_oid), Int16GetDatum(att_num), BoolGetDatum(true));
955  if ( stats_tuple )
956  POSTGIS_DEBUGF(2, "found whole tree stats for \"%s\"", get_rel_name(table_oid)? get_rel_name(table_oid) : "NULL");
957  }
958  /* Fall-back to main table stats only, if not found for whole tree or explicitly ignored */
959  if ( only_parent || ! stats_tuple )
960  {
961  POSTGIS_DEBUGF(2, "searching parent table stats for \"%s\"", get_rel_name(table_oid)? get_rel_name(table_oid) : "NULL");
962  stats_tuple = SearchSysCache3(STATRELATTINH, ObjectIdGetDatum(table_oid), Int16GetDatum(att_num), BoolGetDatum(false));
963  if ( stats_tuple )
964  POSTGIS_DEBUGF(2, "found parent table stats for \"%s\"", get_rel_name(table_oid)? get_rel_name(table_oid) : "NULL");
965  }
966  if ( ! stats_tuple )
967  {
968  POSTGIS_DEBUGF(2, "stats for \"%s\" do not exist", get_rel_name(table_oid)? get_rel_name(table_oid) : "NULL");
969  return NULL;
970  }
971 
972  nd_stats = pg_nd_stats_from_tuple(stats_tuple, mode);
973  ReleaseSysCache(stats_tuple);
974  if ( ! nd_stats )
975  {
976  POSTGIS_DEBUGF(2,
977  "histogram for attribute %d of table \"%s\" does not exist?",
978  att_num, get_rel_name(table_oid));
979  }
980 
981  return nd_stats;
982 }
static ND_STATS * pg_nd_stats_from_tuple(HeapTuple stats_tuple, int mode)
N-dimensional statistics structure.
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