presto-jmx/src/main/java/io/prestosql/plugin/jmx/JmxMetadata.java/JmxMetadata/getColumnType
class JmxMetadata:    private static Type getColumnType(MBeanAttributeInfo attribute)
    {
        switch (attribute.getType()) {
            case "boolean":
            case "java.lang.Boolean":
                return BOOLEAN;
            case "byte":
            case "java.lang.Byte":
            case "short":
            case "java.lang.Short":
            case "int":
            case "java.lang.Integer":
            case "long":
            case "java.lang.Long":
                return BIGINT;
            case "java.lang.Number":
            case "float":
            case "java.lang.Float":
            case "double":
            case "java.lang.Double":
                return DOUBLE;
        }
        return createUnboundedVarcharType();
    }