panbingkun opened a new pull request, #47422:
URL: https://github.com/apache/spark/pull/47422
### What changes were proposed in this pull request?
The pr aims to introduce `SHOW VARIABLES LIKE ...` SQL syntax to `get
variables`.
### Why are the changes needed?
- currently, regarding `VARIABLE`, we support the following syntax:
```
DECLARE (OR REPLACE)? VARIABLE ...
DROP TEMPORARY VARIABLE (IF EXISTS)? ...
SET (VARIABLE | VAR) ...
```
But we are unable to obtain the current status of `VARIABLE`
- other databases have similar syntax, eg:
snowflake: https://docs.snowflake.com/en/sql-reference/sql/show-variables
<img width="805" alt="image"
src="https://github.com/user-attachments/assets/5c2fd7fe-6f38-4376-902b-d3eebb81d250";>
Mysql: https://dev.mysql.com/doc/refman/8.4/en/show-variables.html
oracle:
https://docs.oracle.com/cd/E17952_01/mysql-5.7-en/show-variables.html
teradata:
https://docs.teradata.com/r/Enterprise_IntelliFlex_VMware/Database-Utilities/Control-GDO-Editor-ctl/Ctl-Commands/PRINT-variable
- so I propose introducing syntax `SHOW VARIABLES LIKE ...` that can
retrieve all variables in the spark system.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Add new UT.
### Was this patch authored or co-authored using generative AI tooling?
No.
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