Function CompareNumbers

pg_documentdb_core/src/query/bson_compare.c:1361–1412

static int
CompareNumbers(const bson_value_t *leftValue, const bson_value_t *rightValue,
			   bool *isComparisonValid)
{
	*isComparisonValid = true;
	if (leftValue->value_type == BSON_TYPE_DECIMAL128 ||
		rightValue->value_type == BSON_TYPE_DECIMAL128)
	{
		/* promote type to decimal128 for both values */
		bson_value_t leftDecimal, rightDecimal;
		leftDecimal.value_type = BSON_TYPE_DECIMAL128;
		rightDecimal.value_type = BSON_TYPE_DECIMAL128;

		leftDecimal.value.v_decimal128 = GetBsonValueAsDecimal128(leftValue);
		rightDecimal.value.v_decimal128 = GetBsonValueAsDecimal128(rightValue);

		return CompareBsonDecimal128(&leftDecimal, &rightDecimal, isComparisonValid);
	}
	else if (leftValue->value_type == BSON_TYPE_DOUBLE ||
			 rightValue->value_type == BSON_TYPE_DOUBLE)
	{
		long double leftVal = BsonNumberAsLongDouble(leftValue);
		long double rightVal = BsonNumberAsLongDouble(rightValue);

		/* special case handling for NaN */
		if (isnan(leftVal) || isnan(rightVal))
		{
			if (isnan(leftVal) && isnan(rightVal))
			{
				return 0;
			}
			else if (isnan(leftVal))
			{
				*isComparisonValid = false;
				return -1;
			}
			else
			{
				*isComparisonValid = false;
				return 1;
			}
		}

		return leftVal > rightVal ? 1 : (leftVal == rightVal ? 0 : -1);
	}
	else
	{
		int64_t leftVal = BsonValueAsInt64(leftValue);
		int64_t rightVal = BsonValueAsInt64(rightValue);
		return leftVal > rightVal ? 1 : (leftVal == rightVal ? 0 : -1);
	}
}


/*