druid/docs/content/TimeBoundaryQuery.md

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Time boundary queries return the earliest and latest data points of a data set. The grammar is:

{
    "queryType" : "timeBoundary",
    "dataSource": "sample_datasource"
}

There are 3 main parts to a time boundary query:

property	description	required?
queryType	This String should always be "timeBoundary"; this is the first thing Druid looks at to figure out how to interpret the query	yes
dataSource	A String defining the data source to query, very similar to a table in a relational database	yes
context	An additional JSON Object which can be used to specify certain flags.	no

The format of the result is:

[ {
  "timestamp" : "2013-05-09T18:24:00.000Z",
  "result" : {
    "minTime" : "2013-05-09T18:24:00.000Z",
    "maxTime" : "2013-05-09T18:37:00.000Z"
  }
} ]