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.

    Data Source Metadata queries return metadata information for a dataSource. These queries return information about:

    • The timestamp of latest ingested event for the dataSource. This is the ingested event without any consideration of rollup.

    The grammar for these queries is:

    1. {
    2.     "queryType" : "dataSourceMetadata",
    3.     "dataSource": "sample_datasource"
    4. }

    There are 2 main parts to a Data Source Metadata query:

    propertydescriptionrequired?
    queryTypeThis String should always be “dataSourceMetadata”; 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
    contextSee Contextno

    The format of the result is:

    1. [ {
    2.   "timestamp" : "2013-05-09T18:24:00.000Z",
    3.   "result" : {
    4.     "maxIngestedEventTime" : "2013-05-09T18:24:09.007Z"
    5.   }
    6. } ]