PostGIS  2.5.0beta1dev-r@@SVN_REVISION@@

◆ _postgis_gserialized_stats()

Datum _postgis_gserialized_stats ( PG_FUNCTION_ARGS  )

Definition at line 2037 of file gserialized_estimate.c.

References _postgis_gserialized_sel(), nd_stats_to_json(), PG_FUNCTION_INFO_V1(), pg_get_nd_stats_by_name(), text_p_get_mode(), and text_to_cstring().

Referenced by estimate_selectivity().

2038 {
2039  Oid table_oid = PG_GETARG_OID(0);
2040  text *att_text = PG_GETARG_TEXT_P(1);
2041  ND_STATS *nd_stats;
2042  char *str;
2043  text *json;
2044  int mode = 2; /* default to 2D mode */
2045  bool only_parent = false; /* default to whole tree stats */
2046 
2047  /* Check if we've been asked to not use 2d mode */
2048  if ( ! PG_ARGISNULL(2) )
2049  mode = text_p_get_mode(PG_GETARG_TEXT_P(2));
2050 
2051  /* Check if we've been asked to only use stats from parent */
2052  if ( ! PG_ARGISNULL(3) )
2053  only_parent = PG_GETARG_BOOL(3);
2054 
2055  /* Retrieve the stats object */
2056  nd_stats = pg_get_nd_stats_by_name(table_oid, att_text, mode, only_parent);
2057  if ( ! nd_stats )
2058  elog(ERROR, "stats for \"%s.%s\" do not exist", get_rel_name(table_oid), text_to_cstring(att_text));
2059 
2060  /* Convert to JSON */
2061  str = nd_stats_to_json(nd_stats);
2062  json = cstring_to_text(str);
2063  pfree(str);
2064  pfree(nd_stats);
2065  PG_RETURN_TEXT_P(json);
2066 }
char * text_to_cstring(const text *textptr)
static ND_STATS * pg_get_nd_stats_by_name(const Oid table_oid, const text *att_text, int mode, bool only_parent)
Pull the stats object from the PgSQL system catalogs.
static int text_p_get_mode(const text *txt)
Utility function to see if the first letter of the mode argument is 'N'.
static char * nd_stats_to_json(const ND_STATS *nd_stats)
Convert an ND_STATS to a JSON representation for external use.
N-dimensional statistics structure.
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