PostGIS  2.2.7dev-r@@SVN_REVISION@@
static char* nd_stats_to_json ( const ND_STATS nd_stats)
static

Convert an ND_STATS to a JSON representation for external use.

Definition at line 401 of file gserialized_estimate.c.

References ND_STATS_T::cells_covered, ND_STATS_T::extent, ND_STATS_T::histogram_cells, ND_STATS_T::histogram_features, nd_box_to_json(), ND_STATS_T::ndims, ND_STATS_T::not_null_features, ND_STATS_T::sample_features, ND_STATS_T::size, stringbuffer_append(), stringbuffer_aprintf(), stringbuffer_create(), stringbuffer_destroy(), stringbuffer_getstringcopy(), and ND_STATS_T::table_features.

Referenced by _postgis_gserialized_stats(), compute_gserialized_stats_mode(), estimate_join_selectivity(), and gserialized_gist_sel().

402 {
403  char *json_extent, *str;
404  int d;
406  int ndims = (int)roundf(nd_stats->ndims);
407 
408  stringbuffer_append(sb, "{");
409  stringbuffer_aprintf(sb, "\"ndims\":%d,", ndims);
410 
411  /* Size */
412  stringbuffer_append(sb, "\"size\":[");
413  for ( d = 0; d < ndims; d++ )
414  {
415  if ( d ) stringbuffer_append(sb, ",");
416  stringbuffer_aprintf(sb, "%d", (int)roundf(nd_stats->size[d]));
417  }
418  stringbuffer_append(sb, "],");
419 
420  /* Extent */
421  json_extent = nd_box_to_json(&(nd_stats->extent), ndims);
422  stringbuffer_aprintf(sb, "\"extent\":%s,", json_extent);
423  pfree(json_extent);
424 
425  stringbuffer_aprintf(sb, "\"table_features\":%d,", (int)roundf(nd_stats->table_features));
426  stringbuffer_aprintf(sb, "\"sample_features\":%d,", (int)roundf(nd_stats->sample_features));
427  stringbuffer_aprintf(sb, "\"not_null_features\":%d,", (int)roundf(nd_stats->not_null_features));
428  stringbuffer_aprintf(sb, "\"histogram_features\":%d,", (int)roundf(nd_stats->histogram_features));
429  stringbuffer_aprintf(sb, "\"histogram_cells\":%d,", (int)roundf(nd_stats->histogram_cells));
430  stringbuffer_aprintf(sb, "\"cells_covered\":%d", (int)roundf(nd_stats->cells_covered));
431  stringbuffer_append(sb, "}");
432 
433  str = stringbuffer_getstringcopy(sb);
435  return str;
436 }
stringbuffer_t * stringbuffer_create(void)
Allocate a new stringbuffer_t.
Definition: stringbuffer.c:46
char * stringbuffer_getstringcopy(stringbuffer_t *s)
Returns a newly allocated string large enough to contain the current state of the string...
Definition: stringbuffer.c:153
int stringbuffer_aprintf(stringbuffer_t *s, const char *fmt,...)
Appends a formatted string to the current string buffer, using the format and argument list provided...
Definition: stringbuffer.c:246
float4 size[ND_DIMS]
static char * nd_box_to_json(const ND_BOX *nd_box, int ndims)
Convert an ND_BOX to a JSON string for printing.
void stringbuffer_append(stringbuffer_t *s, const char *a)
Append the specified string to the stringbuffer_t.
Definition: stringbuffer.c:127
void stringbuffer_destroy(stringbuffer_t *s)
Free the stringbuffer_t and all memory managed within it.
Definition: stringbuffer.c:71

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