PostGIS  2.5.0beta2dev-r@@SVN_REVISION@@

◆ nd_stats_value_index()

static int nd_stats_value_index ( const ND_STATS stats,
int *  indexes 
)
static

Given a position in the n-d histogram (i,j,k) return the position in the 1-d values array.

Definition at line 415 of file gserialized_estimate.c.

References ND_STATS_T::ndims, and ND_STATS_T::size.

Referenced by compute_gserialized_stats_mode(), estimate_join_selectivity(), and estimate_selectivity().

416 {
417  int d;
418  int accum = 1, vdx = 0;
419 
420  /* Calculate the index into the 1-d values array that the (i,j,k,l) */
421  /* n-d histogram coordinate implies. */
422  /* index = x + y * sizex + z * sizex * sizey + m * sizex * sizey * sizez */
423  for ( d = 0; d < (int)(stats->ndims); d++ )
424  {
425  int size = (int)(stats->size[d]);
426  if ( indexes[d] < 0 || indexes[d] >= size )
427  {
428  POSTGIS_DEBUGF(3, " bad index at (%d, %d)", indexes[0], indexes[1]);
429  return -1;
430  }
431  vdx += indexes[d] * accum;
432  accum *= size;
433  }
434  return vdx;
435 }
float4 size[ND_DIMS]
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