PostGIS  2.5.1dev-r@@SVN_REVISION@@

◆ gserialized_analyze_nd()

Datum gserialized_analyze_nd ( PG_FUNCTION_ARGS  )

Definition at line 1892 of file gserialized_estimate.c.

References compute_gserialized_stats().

Referenced by compute_gserialized_stats().

1893 {
1894  VacAttrStats *stats = (VacAttrStats *)PG_GETARG_POINTER(0);
1895  Form_pg_attribute attr = stats->attr;
1896 
1897  POSTGIS_DEBUG(2, "gserialized_analyze_nd called");
1898 
1899  /* If the attstattarget column is negative, use the default value */
1900  /* NB: it is okay to scribble on stats->attr since it's a copy */
1901  if (attr->attstattarget < 0)
1902  attr->attstattarget = default_statistics_target;
1903 
1904  POSTGIS_DEBUGF(3, " attribute stat target: %d", attr->attstattarget);
1905 
1906  /* Setup the minimum rows and the algorithm function */
1907  stats->minrows = 300 * stats->attr->attstattarget;
1908  stats->compute_stats = compute_gserialized_stats;
1909 
1910  POSTGIS_DEBUGF(3, " minrows: %d", stats->minrows);
1911 
1912  /* Indicate we are done successfully */
1913  PG_RETURN_BOOL(true);
1914 }
static void compute_gserialized_stats(VacAttrStats *stats, AnalyzeAttrFetchFunc fetchfunc, int sample_rows, double total_rows)
In order to do useful selectivity calculations in both 2-D and N-D modes, we actually have to generat...
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