PostGIS  2.1.10dev-r@@SVN_REVISION@@
Datum gserialized_analyze_nd ( PG_FUNCTION_ARGS  )

Definition at line 1739 of file gserialized_estimate.c.

References compute_gserialized_stats().

1740 {
1741  VacAttrStats *stats = (VacAttrStats *)PG_GETARG_POINTER(0);
1742  Form_pg_attribute attr = stats->attr;
1743 
1744  POSTGIS_DEBUG(2, "gserialized_analyze_nd called");
1745 
1746  /* If the attstattarget column is negative, use the default value */
1747  /* NB: it is okay to scribble on stats->attr since it's a copy */
1748  if (attr->attstattarget < 0)
1749  attr->attstattarget = default_statistics_target;
1750 
1751  POSTGIS_DEBUGF(3, " attribute stat target: %d", attr->attstattarget);
1752 
1753  /* Setup the minimum rows and the algorithm function */
1754  stats->minrows = 300 * stats->attr->attstattarget;
1755  stats->compute_stats = compute_gserialized_stats;
1756 
1757  POSTGIS_DEBUGF(3, " minrows: %d", stats->minrows);
1758 
1759  /* Indicate we are done successfully */
1760  PG_RETURN_BOOL(true);
1761 }
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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