feat: CREATE OR REPLACE TASK syntax

[BohuTANG]

Summary

Most Dtabend DML statements now support the CREATE OR REPLACE syntax to modify existing objects, with the exception of TASK objects.
We need to support:
CREATE OR REPLACE TASK ...

Reference: https://docs.databend.com/sql/sql-commands/ddl/task/ddl-create_task

[nagxsan]

Hi! Can you please assign this task to me?

[nagxsan]

Hi!

Sorry for the delay.

Can you please tell me if I can consider this test as a reference point for building this functionality out?
https://github.com/nagxsan/databend/blob/6887233c0e836837ab9f5c35ff2d15a028ff8cee/src/meta/api/src/schema_api_test_suite.rs#L2076

[BohuTANG]

The task may not same as the tables which meta data is stored in the metasrv.
If the task meta is not stored in the metasrv I think this issue is not an GOOD FIRST ISSUE :/
@ZhiHanZ could you help have a check?

[nagxsan]

Hey @BohuTANG ! Can you please let me know if I should continue working on this task if it is not a good first issue?

[BohuTANG]

Confirmed from zhihan, this is not a good first issue, task not only in Databend and also connect to a RPC server.
Sorry for late response.

[BohuTANG]

Implemented by @sundy-li in #17920. Thanks all.