yaooqinn opened a new pull request #29064:
URL: https://github.com/apache/spark/pull/29064
### 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'.
What's more, the `SET TIME ZONE ALL` is added as an extension to list all
the supported region-based Zone IDs supported.
The `SET TIME ZONE` with intervals are not considered, because it has to be
qualified with interval qualifier HOUR TO MINUTE which is not fully supported
in Spark now.
All in all, this PR adds syntax as following,
```
SET TIME ZONE LOCAL;
SET TIME ZONE 'valid time zone';
SET TIME ZONE ALL; (extended)
```
### Why are the changes needed?
<!--
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1. If you propose a new API, clarify the use case for a new API.
2. If you fix a bug, you can clarify why it is a bug.
-->
ANSI compliance and supply pure SQL users a way to retrieve all supported
TimeZones
### Does this PR introduce _any_ user-facing change?
<!--
Note that it means *any* user-facing change including all aspects such as
the documentation fix.
If yes, please clarify the previous behavior and the change this PR proposes
- provide the console output, description and/or an example to show the
behavior difference if possible.
If possible, please also clarify if this is a user-facing change compared to
the released Spark versions or within the unreleased branches such as master.
If no, write 'No'.
-->
yes, add new syntax.
### How was this patch tested?
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test cases that check the changes thoroughly including negative and positive
cases if possible.
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how you tested step by step, ideally copy and paste-able, so that other
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it was difficult to add.
-->
add unit tests.
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