Hi,

first thanks for this awesome software. But I have some trouble and I don't know how to proceed. First I try to find out what else I could provide for this report to be a good bug report.

First, I use the latest version (v1.14.0) from openSUSE build Service. I know, I should compile it by my self to avoid any other causes for this behavior. But for now I still use this package from there

Bug Description
In Jdbc, DatabaseMetaDataResultSet.java. there is wrong using BigDecimal method.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'src/main/java/com/taosdata/jdbc/DatabaseMetaDataResultSet.java'
2. Type in 'BigDecimal'
3. See error 'double value = rowCursor.getDouble(columnIndex, colType); return new BigDecimal(value);'

Expected Behavior
'double value

Relevant telegraf.conf:

[[outputs.graylog]]
  ## UDP endpoint for your graylog instances.
  servers = ["127.0.0.1:12201"]

Expected behavior:

Input plugin name field (e.g. "name":"log_tail") should be sent with _ prefix. Regarding Gelf specification (https://docs.graylog.org/en/4.1/pages/gelf.html#gelf-payload-specification), all non standard fields should always