Function PopulateDensifyArgs

pg_documentdb/src/aggregation/bson_densify.c:1086–1347

* Parses the densifySpec and populates the values in DensifyArguments structure */

 * Parses the densifySpec and populates the values in DensifyArguments structure
 */
static void
PopulateDensifyArgs(DensifyArguments *arguments, const pgbson *densifySpec)
{
	Assert(arguments != NULL);
	bson_iter_t iter;
	PgbsonInitIterator(densifySpec, &iter);
	bson_value_t fieldValue = { 0 };
	bson_value_t rangeValue = { 0 };
	bson_value_t partitionByFieldsValue = { 0 };

	while (bson_iter_next(&iter))
	{
		pgbsonelement element;
		BsonIterToPgbsonElement(&iter, &element);

		if (strcmp(element.path, "field") == 0)
		{
			fieldValue = element.bsonValue;
		}
		else if (strcmp(element.path, "range") == 0)
		{
			rangeValue = element.bsonValue;
		}
		else if (strcmp(element.path, "partitionByFields") == 0)
		{
			partitionByFieldsValue = element.bsonValue;
		}
	}

	/* Parse required field */
	if (fieldValue.value_type != BSON_TYPE_EOD)
	{
		EnsureTopLevelFieldValueType("$densify.field", &fieldValue, BSON_TYPE_UTF8);
		EnsureStringValueNotDollarPrefixed(fieldValue.value.v_utf8.str,
										   fieldValue.value.v_utf8.len);

		arguments->field = CreateStringViewFromString(fieldValue.value.v_utf8.str);
	}
	else
	{
		ThrowTopLevelMissingFieldErrorWithCode("$densify.field",
											   ERRCODE_DOCUMENTDB_LOCATION40414);
	}

	/* Parse required range */
	if (rangeValue.value_type != BSON_TYPE_EOD)
	{
		EnsureTopLevelFieldValueType("$densify.range", &rangeValue, BSON_TYPE_DOCUMENT);

		bson_iter_t rangeIter;
		BsonValueInitIterator(&rangeValue, &rangeIter);
		while (bson_iter_next(&rangeIter))
		{
			pgbsonelement rangeElement;
			BsonIterToPgbsonElement(&rangeIter, &rangeElement);

			if (strcmp(rangeElement.path, "bounds") == 0)
			{