PostGIS  3.1.6dev-r@@SVN_REVISION@@

◆ nd_stats_to_json()

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 483 of file gserialized_estimate.c.

484 {
485  char *json_extent, *str;
486  int d;
488  int ndims = (int)roundf(nd_stats->ndims);
489 
490  stringbuffer_append(sb, "{");
491  stringbuffer_aprintf(sb, "\"ndims\":%d,", ndims);
492 
493  /* Size */
494  stringbuffer_append(sb, "\"size\":[");
495  for ( d = 0; d < ndims; d++ )
496  {
497  if ( d ) stringbuffer_append(sb, ",");
498  stringbuffer_aprintf(sb, "%d", (int)roundf(nd_stats->size[d]));
499  }
500  stringbuffer_append(sb, "],");
501 
502  /* Extent */
503  json_extent = nd_box_to_json(&(nd_stats->extent), ndims);
504  stringbuffer_aprintf(sb, "\"extent\":%s,", json_extent);
505  pfree(json_extent);
506 
507  stringbuffer_aprintf(sb, "\"table_features\":%d,", (int)roundf(nd_stats->table_features));
508  stringbuffer_aprintf(sb, "\"sample_features\":%d,", (int)roundf(nd_stats->sample_features));
509  stringbuffer_aprintf(sb, "\"not_null_features\":%d,", (int)roundf(nd_stats->not_null_features));
510  stringbuffer_aprintf(sb, "\"histogram_features\":%d,", (int)roundf(nd_stats->histogram_features));
511  stringbuffer_aprintf(sb, "\"histogram_cells\":%d,", (int)roundf(nd_stats->histogram_cells));
512  stringbuffer_aprintf(sb, "\"cells_covered\":%d", (int)roundf(nd_stats->cells_covered));
513  stringbuffer_append(sb, "}");
514 
517  return str;
518 }
static char * nd_box_to_json(const ND_BOX *nd_box, int ndims)
Convert an ND_BOX to a JSON string for printing.
#define str(s)
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:228
stringbuffer_t * stringbuffer_create(void)
Allocate a new stringbuffer_t.
Definition: stringbuffer.c:33
void stringbuffer_destroy(stringbuffer_t *s)
Free the stringbuffer_t and all memory managed within it.
Definition: stringbuffer.c:76
char * stringbuffer_getstringcopy(stringbuffer_t *s)
Returns a newly allocated string large enough to contain the current state of the string.
Definition: stringbuffer.c:124
static void stringbuffer_append(stringbuffer_t *s, const char *a)
Append the specified string to the stringbuffer_t.
Definition: stringbuffer.h:103
float4 size[ND_DIMS]

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, str, 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(), and estimate_join_selectivity().

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