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

Definition at line 1873 of file gserialized_estimate.c.

References compute_gserialized_stats().

1874 {
1875  VacAttrStats *stats = (VacAttrStats *)PG_GETARG_POINTER(0);
1876  Form_pg_attribute attr = stats->attr;
1877 
1878  POSTGIS_DEBUG(2, "gserialized_analyze_nd called");
1879 
1880  /* If the attstattarget column is negative, use the default value */
1881  /* NB: it is okay to scribble on stats->attr since it's a copy */
1882  if (attr->attstattarget < 0)
1883  attr->attstattarget = default_statistics_target;
1884 
1885  POSTGIS_DEBUGF(3, " attribute stat target: %d", attr->attstattarget);
1886 
1887  /* Setup the minimum rows and the algorithm function */
1888  stats->minrows = 300 * stats->attr->attstattarget;
1889  stats->compute_stats = compute_gserialized_stats;
1890 
1891  POSTGIS_DEBUGF(3, " minrows: %d", stats->minrows);
1892 
1893  /* Indicate we are done successfully */
1894  PG_RETURN_BOOL(true);
1895 }
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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