PostGIS  3.1.6dev-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 963 of file gserialized_estimate.c.

964 {
965  HeapTuple stats_tuple = NULL;
966  ND_STATS *nd_stats;
967 
968  /* First pull the stats tuple for the whole tree */
969  if ( ! only_parent )
970  {
971  POSTGIS_DEBUGF(2, "searching whole tree stats for \"%s\"", get_rel_name(table_oid)? get_rel_name(table_oid) : "NULL");
972  stats_tuple = SearchSysCache3(STATRELATTINH, ObjectIdGetDatum(table_oid), Int16GetDatum(att_num), BoolGetDatum(true));
973  if ( stats_tuple )
974  POSTGIS_DEBUGF(2, "found whole tree stats for \"%s\"", get_rel_name(table_oid)? get_rel_name(table_oid) : "NULL");
975  }
976  /* Fall-back to main table stats only, if not found for whole tree or explicitly ignored */
977  if ( only_parent || ! stats_tuple )
978  {
979  POSTGIS_DEBUGF(2, "searching parent table stats for \"%s\"", get_rel_name(table_oid)? get_rel_name(table_oid) : "NULL");
980  stats_tuple = SearchSysCache3(STATRELATTINH, ObjectIdGetDatum(table_oid), Int16GetDatum(att_num), BoolGetDatum(false));
981  if ( stats_tuple )
982  POSTGIS_DEBUGF(2, "found parent table stats for \"%s\"", get_rel_name(table_oid)? get_rel_name(table_oid) : "NULL");
983  }
984  if ( ! stats_tuple )
985  {
986  POSTGIS_DEBUGF(2, "stats for \"%s\" do not exist", get_rel_name(table_oid)? get_rel_name(table_oid) : "NULL");
987  return NULL;
988  }
989 
990  nd_stats = pg_nd_stats_from_tuple(stats_tuple, mode);
991  ReleaseSysCache(stats_tuple);
992  if ( ! nd_stats )
993  {
994  POSTGIS_DEBUGF(2,
995  "histogram for attribute %d of table \"%s\" does not exist?",
996  att_num, get_rel_name(table_oid));
997  }
998 
999  return nd_stats;
1000 }
static ND_STATS * pg_nd_stats_from_tuple(HeapTuple stats_tuple, int mode)
N-dimensional statistics structure.

References pg_nd_stats_from_tuple().

Referenced by gserialized_joinsel_internal(), and pg_get_nd_stats_by_name().

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