System functions

These functions return metadata type of information about the system being queried.

`DATABASE`

DATABASE()

Input: none

Output: string

Description: Returns the name of the database being queried. In the case of Elasticsearch SQL, this is the name of the Elasticsearch cluster. This function should always return a non-null value.

SELECT DATABASE(); DATABASE --------------- elasticsearch

`USER`

USER()

Input: none

Output: string

Description: Returns the username of the authenticated user executing the query. This function can return null in case security is disabled.

SELECT USER(); USER --------------- elastic