[GitHub] surekhasaharan opened a new pull request #6094: Introduce SystemSchema tables (#5989)

[GitBox <gi...@apache.org>]

surekhasaharan opened a new pull request #6094: Introduce SystemSchema tables (#5989)
URL: https://github.com/apache/incubator-druid/pull/6094
 
 
   SYSTEM_TABLES provide visibility into the druid segments, servers and tasks.
   
   * SEGMENTS table provides details on served and published segments
   * SERVERS table provides details on data servers
   * SERVERSEGMETS table is the JOIN of SEGMENTS and SERVERS
   * TASKS table provides details on tasks from overlord
   
   Sample sql queries to retrieve data from these tables:
   ```sql
   select * from SYS.SEGMENTS where DATASOURCE='wikipedia';
   select * from SYS.SERVERS;
   select * from SYS.TASKS where STATUS='FAILED';
   ```

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