new feature: allows user to specify timeZone in TimestampSpec, How to use:
```
"timestampSpec": {
"format": "yyyy-MM-dd HH:mm:ss",
"column": "logTime",
"timezone": "Asia/Shanghai"
}
```
If param absence, the default timeZone is UTC.[ Full content available at: https://github.com/apache/incubator-druid/pull/6365 ] This message was relayed via gitbox.apache.org for [email protected]
