mirror of https://github.com/apache/druid.git
63 lines
2.2 KiB
Markdown
63 lines
2.2 KiB
Markdown
---
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id: datasourcemetadataquery
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title: "DatasourceMetadata queries"
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sidebar_label: "DatasourceMetadata"
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---
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<!--
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~ Licensed to the Apache Software Foundation (ASF) under one
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~ or more contributor license agreements. See the NOTICE file
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~ distributed with this work for additional information
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~ regarding copyright ownership. The ASF licenses this file
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~ to you under the Apache License, Version 2.0 (the
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~ "License"); you may not use this file except in compliance
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~ with the License. You may obtain a copy of the License at
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~ http://www.apache.org/licenses/LICENSE-2.0
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~ Unless required by applicable law or agreed to in writing,
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~ software distributed under the License is distributed on an
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~ under the License.
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:::info
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Apache Druid supports two query languages: [Druid SQL](sql.md) and [native queries](querying.md).
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This document describes a query
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type that is only available in the native language.
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:::
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Data Source Metadata queries return metadata information for a dataSource. These queries return information about:
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* The timestamp of the latest ingested event for the dataSource. This is the ingested event without any consideration of rollup.
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The grammar for these queries is:
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```json
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{
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"queryType" : "dataSourceMetadata",
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"dataSource": "sample_datasource"
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}
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```
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There are 2 main parts to a Data Source Metadata query:
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|property|description|required?|
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|--------|-----------|---------|
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|queryType|This String should always be "dataSourceMetadata"; this is the first thing Apache Druid looks at to figure out how to interpret the query|yes|
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|dataSource|A String or Object defining the data source to query, very similar to a table in a relational database. See [DataSource](../querying/datasource.md) for more information.|yes|
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|context|See [Context](../querying/query-context.md)|no|
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The format of the result is:
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```json
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[ {
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"timestamp" : "2013-05-09T18:24:00.000Z",
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"result" : {
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"maxIngestedEventTime" : "2013-05-09T18:24:09.007Z"
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}
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} ]
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```
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