PostGIS  3.0.0dev-r@@SVN_REVISION@@

◆ _postgis_gserialized_stats()

Datum _postgis_gserialized_stats ( PG_FUNCTION_ARGS  )

Definition at line 2053 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().

2054 {
2055  Oid table_oid = PG_GETARG_OID(0);
2056  text *att_text = PG_GETARG_TEXT_P(1);
2057  ND_STATS *nd_stats;
2058  char *str;
2059  text *json;
2060  int mode = 2; /* default to 2D mode */
2061  bool only_parent = false; /* default to whole tree stats */
2062 
2063  /* Check if we've been asked to not use 2d mode */
2064  if ( ! PG_ARGISNULL(2) )
2065  mode = text_p_get_mode(PG_GETARG_TEXT_P(2));
2066 
2067  /* Check if we've been asked to only use stats from parent */
2068  if ( ! PG_ARGISNULL(3) )
2069  only_parent = PG_GETARG_BOOL(3);
2070 
2071  /* Retrieve the stats object */
2072  nd_stats = pg_get_nd_stats_by_name(table_oid, att_text, mode, only_parent);
2073  if ( ! nd_stats )
2074  elog(ERROR, "stats for \"%s.%s\" do not exist", get_rel_name(table_oid), text_to_cstring(att_text));
2075 
2076  /* Convert to JSON */
2077  str = nd_stats_to_json(nd_stats);
2078  json = cstring_to_text(str);
2079  pfree(str);
2080  pfree(nd_stats);
2081  PG_RETURN_TEXT_P(json);
2082 }
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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