feat: support select session_user;

[yihong0618]

This commit is part of support DBeaver that support function select session_user like postgres did.

first part of #5271 (comment)
will support select pg_catalog.pg_database; in next patch

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Please convert it to a draft if some of the following conditions are not met.

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• Schema or data changes are backward compatible.

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[codecov]

Codecov Report

Attention: Patch coverage is 42.10526% with 11 lines in your changes missing coverage. Please review.

Project coverage is 83.87%. Comparing base (c89ef85) to head (ded5cf6).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5313      +/-   ##
==========================================
- Coverage   84.16%   83.87%   -0.30%     
==========================================
  Files        1200     1202       +2     
  Lines      225386   226040     +654     
==========================================
- Hits       189698   189590     -108     
- Misses      35688    36450     +762     

[sunng87]

Awesome! Can we add a test case for this? It can be a sqlness test.

By the way, why it fails when we call select session_user()

[yihong0618]

Awesome! Can we add a test case for this? It can be a sqlness test.

By the way, why it fails when we call select session_user()

the same as pg
FYI you can use pglite for quick pg command test its cool

https://pglite.dev/repl/

[sunng87]

@yihong0618 That's very helpful. Bookmarked.

[killme2008]

Thank you. LGTM. Please add a sqlness test just like https://github.com/GreptimeTeam/greptimedb/blob/main/tests/cases/standalone/common/system/pg_catalog.sql

You can run the sqlness tests via cargo sqlness -t <file_name>

[yihong0618]

Thank you. LGTM. Please add a sqlness test just like https://github.com/GreptimeTeam/greptimedb/blob/main/tests/cases/standalone/common/system/pg_catalog.sql

You can run the sqlness tests via cargo sqlness -t <file_name>

Done～

and found <file_name> is not file_name is regex....

[sunng87]

@yihong0618 Thank you!