[Enhancement] support trino's show schemas function

[rohitrs1983]

Why I'm doing:

What I'm doing:

mysql> set sql_dialect=trino;

mysql> show schemas;
+--------------------+
| Database |
+--------------------+
| statistics |
| information_schema |
| mydb |
| sys |
+--------------------+

mysql> show schemas from default_catalog;
+--------------------+
| Database |
+--------------------+
| statistics |
| information_schema |
| mydb |
| sys |
+--------------------+

mysql> show schemas from default_catalog like '__db';
+----------+
| Database |
+----------+
| mydb |
+----------+

Fixes #40894

What type of PR is this:

• BugFix
• Feature
• Enhancement
• Refactor
• UT
• Doc
• Tool

Does this PR entail a change in behavior?

• Yes, this PR will result in a change in behavior.
• No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• Interface/UI changes: syntax, type conversion, expression evaluation, display information
• Parameter changes: default values, similar parameters but with different default values
• Policy changes: use new policy to replace old one, functionality automatically enabled
• Feature removed
• Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function
• This is a backport pr

Bugfix cherry-pick branch check:

• I have checked the version labels which the pr will be auto-backported to the target branch
  • 3.3
  • 3.2
  • 3.1
  • 3.0
  • 2.5

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[wangsimo0]

hi rohitrs1983 thanks for your contribution!
trino's show schema is a very useful sql that sr didn't support in trino's SQL dialect. However I think it is better supported under sr's trino dialect instead of introducing schema into starrocks. cause starrocks doesn't have the concept of schema all the time.
do you mind support this in trinotransformer? https://github.com/StarRocks/starrocks/tree/7982265b4e0ba59e5cfc882e44b1a7cbfe361923/fe/fe-core/src/main/java/com/starrocks/connector/parser/trino
And I think trino's show schemas from catalog is same as starrocks show databases from catalog.

[rohitrs1983]

hi rohitrs1983 thanks for your contribution! trino's show schema is a very useful sql that sr didn't support in trino's SQL dialect. However I think it is better supported under sr's trino dialect instead of introducing schema into starrocks. cause starrocks doesn't have the concept of schema all the time. do you mind support this in trinotransformer? https://github.com/StarRocks/starrocks/tree/7982265b4e0ba59e5cfc882e44b1a7cbfe361923/fe/fe-core/src/main/java/com/starrocks/connector/parser/trino And I think trino's show schemas from catalog is same as starrocks show databases from catalog.

@wangsimo0 ok got it. let me give it a try. thanks for the review.

[rohitrs1983]

hi rohitrs1983 thanks for your contribution! trino's show schema is a very useful sql that sr didn't support in trino's SQL dialect. However I think it is better supported under sr's trino dialect instead of introducing schema into starrocks. cause starrocks doesn't have the concept of schema all the time. do you mind support this in trinotransformer? https://github.com/StarRocks/starrocks/tree/7982265b4e0ba59e5cfc882e44b1a7cbfe361923/fe/fe-core/src/main/java/com/starrocks/connector/parser/trino And I think trino's show schemas from catalog is same as starrocks show databases from catalog.

@wangsimo0 ok got it. let me give it a try. thanks for the review.

@wangsimo0 updated trino dialect. can you please review.

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[Youngwb]

If you convert show shemas to show databases using trino parser, there is no need to modify starrocks parser