Apache Druid supports two query languages: Druid SQL and native queries. This document describes a query type that is only available in the native language.

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

    1. {
    2.     "queryType" : "timeBoundary",
    3.     "dataSource": "sample_datasource",
    4.     "bound"     : < "maxTime" | "minTime" > # optional, defaults to returning both timestamps if not set
    5.     "filter"    : { "type": "and", "fields": [<filter>, <filter>, ...] } # optional
    6. }

    There are 3 main parts to a time boundary query:

    propertydescriptionrequired?
    queryTypeThis String should always be “timeBoundary”; this is the first thing Apache Druid looks at to figure out how to interpret the queryyes
    dataSourceA String or Object defining the data source to query, very similar to a table in a relational database. See DataSource for more information.yes
    boundOptional, set to maxTime or minTime to return only the latest or earliest timestamp. Default to returning both if not setno
    filterSee Filtersno
    contextSee Contextno

    The format of the result is:

    1. [ {
    2.   "timestamp" : "2013-05-09T18:24:00.000Z",
    3.   "result" : {
    4.     "minTime" : "2013-05-09T18:24:00.000Z",
    5.     "maxTime" : "2013-05-09T18:37:00.000Z"
    6.   }
    7. } ]