PostGIS  2.5.0dev-r@@SVN_REVISION@@
Datum _postgis_gserialized_stats ( PG_FUNCTION_ARGS  )

Definition at line 2034 of file gserialized_estimate.c.

References nd_stats_to_json(), pg_get_nd_stats_by_name(), text2cstring(), and text_p_get_mode().

2035 {
2036  Oid table_oid = PG_GETARG_OID(0);
2037  text *att_text = PG_GETARG_TEXT_P(1);
2038  ND_STATS *nd_stats;
2039  char *str;
2040  text *json;
2041  int mode = 2; /* default to 2D mode */
2042  bool only_parent = false; /* default to whole tree stats */
2043 
2044  /* Check if we've been asked to not use 2d mode */
2045  if ( ! PG_ARGISNULL(2) )
2046  mode = text_p_get_mode(PG_GETARG_TEXT_P(2));
2047 
2048  /* Check if we've been asked to only use stats from parent */
2049  if ( ! PG_ARGISNULL(3) )
2050  only_parent = PG_GETARG_BOOL(3);
2051 
2052  /* Retrieve the stats object */
2053  nd_stats = pg_get_nd_stats_by_name(table_oid, att_text, mode, only_parent);
2054  if ( ! nd_stats )
2055  elog(ERROR, "stats for \"%s.%s\" do not exist", get_rel_name(table_oid), text2cstring(att_text));
2056 
2057  /* Convert to JSON */
2058  str = nd_stats_to_json(nd_stats);
2059  json = cstring2text(str);
2060  pfree(str);
2061  pfree(nd_stats);
2062  PG_RETURN_TEXT_P(json);
2063 }
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'.
char * text2cstring(const text *textptr)
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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