[GitHub] gianm commented on a change in pull request #6094: Introduce SystemSchema tables (#5989)

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

gianm commented on a change in pull request #6094: Introduce SystemSchema tables (#5989)
URL: https://github.com/apache/incubator-druid/pull/6094#discussion_r207922200
 
 

 ##########
 File path: docs/content/querying/sql.md
 ##########
 @@ -481,6 +485,77 @@ SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'druid' AND TABLE_
 |COLLATION_NAME||
 |JDBC_TYPE|Type code from java.sql.Types (Druid extension)|
 
+## SYSTEM SCHEMA
+
+SYSTEM_TABLES provide visibility into the druid segments, servers and tasks.
+For example to retrieve all segments for datasource "wikipedia", use the query:
+```sql
+select * from SYS.SEGMENTS where DATASOURCE='wikipedia';
 
 Review comment:
   Lowercase seems more Druid-y, so I think I'd prefer `SELECT * FROM sys.segments WHERE dataSource = 'wikipedia'`. The only reason INFORMATION_SCHEMA isn't like this is because it's a standard thing and uppercase seems more normal for it from looking at other databases.

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