Function populate_array

src/backend/utils/adt/jsonfuncs.c:2832–2877

recursively populate an array from json/jsonb */

/* recursively populate an array from json/jsonb */
static Datum
populate_array(ArrayIOData *aio,
			   const char *colname,
			   MemoryContext mcxt,
			   JsValue *jsv)
{
	PopulateArrayContext ctx;
	Datum		result;
	int		   *lbs;
	int			i;

	ctx.aio = aio;
	ctx.mcxt = mcxt;
	ctx.acxt = CurrentMemoryContext;
	ctx.astate = initArrayResult(aio->element_type, ctx.acxt, true);
	ctx.colname = colname;
	ctx.ndims = 0;				/* unknown yet */
	ctx.dims = NULL;
	ctx.sizes = NULL;

	if (jsv->is_json)
		populate_array_json(&ctx, jsv->val.json.str,
							jsv->val.json.len >= 0 ? jsv->val.json.len
							: strlen(jsv->val.json.str));
	else
	{
		populate_array_dim_jsonb(&ctx, jsv->val.jsonb, 1);
		ctx.dims[0] = ctx.sizes[0];
	}

	Assert(ctx.ndims > 0);

	lbs = palloc(sizeof(int) * ctx.ndims);

	for (i = 0; i < ctx.ndims; i++)
		lbs[i] = 1;

	result = makeMdArrayResult(ctx.astate, ctx.ndims, ctx.dims, lbs,
							   ctx.acxt, true);

	pfree(ctx.dims);
	pfree(ctx.sizes);
	pfree(lbs);

	return result;
}

static void
JsValueToJsObject(JsValue *jsv, JsObject *jso)