PostGIS  2.5.2dev-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 955 of file gserialized_estimate.c.

References pg_nd_stats_from_tuple().

Referenced by gserialized_gist_joinsel(), and pg_get_nd_stats_by_name().

956 {
957  HeapTuple stats_tuple = NULL;
958  ND_STATS *nd_stats;
959 
960  /* First pull the stats tuple for the whole tree */
961  if ( ! only_parent )
962  {
963  POSTGIS_DEBUGF(2, "searching whole tree stats for \"%s\"", get_rel_name(table_oid)? get_rel_name(table_oid) : "NULL");
964  stats_tuple = SearchSysCache3(STATRELATTINH, ObjectIdGetDatum(table_oid), Int16GetDatum(att_num), BoolGetDatum(true));
965  if ( stats_tuple )
966  POSTGIS_DEBUGF(2, "found whole tree stats for \"%s\"", get_rel_name(table_oid)? get_rel_name(table_oid) : "NULL");
967  }
968  /* Fall-back to main table stats only, if not found for whole tree or explicitly ignored */
969  if ( only_parent || ! stats_tuple )
970  {
971  POSTGIS_DEBUGF(2, "searching parent table 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(false));
973  if ( stats_tuple )
974  POSTGIS_DEBUGF(2, "found parent table stats for \"%s\"", get_rel_name(table_oid)? get_rel_name(table_oid) : "NULL");
975  }
976  if ( ! stats_tuple )
977  {
978  POSTGIS_DEBUGF(2, "stats for \"%s\" do not exist", get_rel_name(table_oid)? get_rel_name(table_oid) : "NULL");
979  return NULL;
980  }
981 
982  nd_stats = pg_nd_stats_from_tuple(stats_tuple, mode);
983  ReleaseSysCache(stats_tuple);
984  if ( ! nd_stats )
985  {
986  POSTGIS_DEBUGF(2,
987  "histogram for attribute %d of table \"%s\" does not exist?",
988  att_num, get_rel_name(table_oid));
989  }
990 
991  return nd_stats;
992 }
static ND_STATS * pg_nd_stats_from_tuple(HeapTuple stats_tuple, int mode)
N-dimensional statistics structure.
Here is the call graph for this function:
Here is the caller graph for this function: