Nik Everett d2ea36416b SQL: Expose WEEK function and document datetime functions ()
Adds documentation for all of the date time functions using the new
cli-like format extracted from the csv spec. In the process of doing
this I noticed that the `WEEK` function isn't exposed as a function.
This exposes it for consistency.

Relates to 

Original commit: elastic/x-pack-elasticsearch@0459b24cb9
2018-01-23 07:11:43 -05:00
..
2017-12-21 11:42:57 +01:00