PostGIS  2.3.8dev-r@@SVN_REVISION@@

◆ _postgis_gserialized_stats()

Datum _postgis_gserialized_stats ( PG_FUNCTION_ARGS  )

Definition at line 1991 of file gserialized_estimate.c.

References _postgis_gserialized_sel(), FALSE, nd_stats_to_json(), PG_FUNCTION_INFO_V1(), pg_get_nd_stats_by_name(), text2cstring(), and text_p_get_mode().

Referenced by estimate_selectivity().

1992 {
1993  Oid table_oid = PG_GETARG_OID(0);
1994  text *att_text = PG_GETARG_TEXT_P(1);
1995  ND_STATS *nd_stats;
1996  char *str;
1997  text *json;
1998  int mode = 2; /* default to 2D mode */
1999  bool only_parent = FALSE; /* default to whole tree stats */
2000 
2001  /* Check if we've been asked to not use 2d mode */
2002  if ( ! PG_ARGISNULL(2) )
2003  mode = text_p_get_mode(PG_GETARG_TEXT_P(2));
2004 
2005  /* Check if we've been asked to only use stats from parent */
2006  if ( ! PG_ARGISNULL(3) )
2007  only_parent = PG_GETARG_BOOL(3);
2008 
2009  /* Retrieve the stats object */
2010  nd_stats = pg_get_nd_stats_by_name(table_oid, att_text, mode, only_parent);
2011  if ( ! nd_stats )
2012  elog(ERROR, "stats for \"%s.%s\" do not exist", get_rel_name(table_oid), text2cstring(att_text));
2013 
2014  /* Convert to JSON */
2015  str = nd_stats_to_json(nd_stats);
2016  json = cstring2text(str);
2017  pfree(str);
2018  pfree(nd_stats);
2019  PG_RETURN_TEXT_P(json);
2020 }
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)
#define FALSE
Definition: dbfopen.c:168
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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