Support extract timestamp with specified pattern in LAL.

[weixiang1862]

timestamp required a numeric string (millisecond) as parameter. In most case, we use patterned datetime in raw log for readability. If timestamp support parse time in specified pattern, it can cover all cases.

filter {
  json{
  }
  extractor{
    layer parsed.layer as String
    service parsed.service as String
    timestamp parsed.time as String                  <--------------------
    if (tag("LOG_KIND") == "SLOW_SQL") {
      slowSql {
        id parsed.id as String
        statement parsed.statement as String
        latency parsed.query_time as Long
      }
    }
  }
}

We can add a method ExtractorSpec#timestamp(final String timestamp, final String formatPattern), then user can define time pattern freely in their raw log:

extractor {
    tag status: parsed.status
    tag remote_addr: parsed.remote_addr
    timestamp parsed.time as String, "yyyy-MM-dd'T'HH:mm:ssXXX"      <--------------------
}

[wu-sheng]

I think this is good to have. Are you going to submit a pull request for this?

cc @kezhenxu94

[weixiang1862]

Yes, I will submit after some tests.

[wu-sheng]

Provided by #11489