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spark-instrumented-optimizer/docs/sql-ref-syntax-aux-conf-mgmt.md
Kent Yao bdeb626c5a [SPARK-32272][SQL] Add SQL standard command SET TIME ZONE 
### What changes were proposed in this pull request?

This PR adds the SQL standard command - `SET TIME ZONE` to the current default time zone displacement for the current SQL-session, which is the same as the existing `set spark.sql.session.timeZone=xxx'.

All in all, this PR adds syntax as following,

```
SET TIME ZONE LOCAL;
SET TIME ZONE 'valid time zone';  -- zone offset or region
SET TIME ZONE INTERVAL XXXX; -- xxx must in [-18, + 18] hours, * this range is bigger than ansi  [-14, + 14]
```

### Why are the changes needed?

ANSI compliance and supply pure SQL users a way to retrieve all supported TimeZones

### Does this PR introduce _any_ user-facing change?

yes, add new syntax.

### How was this patch tested?

add unit tests.

and locally verified reference doc

![image](https://user-images.githubusercontent.com/8326978/87510244-c8dc3680-c6a5-11ea-954c-b098be84afee.png)

Closes #29064 from yaooqinn/SPARK-32272.

Authored-by: Kent Yao <yaooqinn@hotmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2020-07-16 13:01:53 +00:00

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