PostGIS  2.5.0dev-r@@SVN_REVISION@@

◆ gserialized_analyze_nd()

Datum gserialized_analyze_nd ( PG_FUNCTION_ARGS  )

Definition at line 1876 of file gserialized_estimate.c.

References compute_gserialized_stats().

Referenced by compute_gserialized_stats().

1877 {
1878  VacAttrStats *stats = (VacAttrStats *)PG_GETARG_POINTER(0);
1879  Form_pg_attribute attr = stats->attr;
1880 
1881  POSTGIS_DEBUG(2, "gserialized_analyze_nd called");
1882 
1883  /* If the attstattarget column is negative, use the default value */
1884  /* NB: it is okay to scribble on stats->attr since it's a copy */
1885  if (attr->attstattarget < 0)
1886  attr->attstattarget = default_statistics_target;
1887 
1888  POSTGIS_DEBUGF(3, " attribute stat target: %d", attr->attstattarget);
1889 
1890  /* Setup the minimum rows and the algorithm function */
1891  stats->minrows = 300 * stats->attr->attstattarget;
1892  stats->compute_stats = compute_gserialized_stats;
1893 
1894  POSTGIS_DEBUGF(3, " minrows: %d", stats->minrows);
1895 
1896  /* Indicate we are done successfully */
1897  PG_RETURN_BOOL(true);
1898 }
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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