feat(frontend): support extended query for cursor #17821

0 / 8 tasks completed

8 tasks still to be completed

Task	Status
When the cursor is created, we use a table to specify a shcema , and then when we fetch, if the shcema result is different from old, we update the shcema and return null to avoid inconsistencies between the schema and the row.	Incomplete
When the cursor is created, we create the row_stream with the default formats, but we don't consume it, we only refill and consume it when fetch inputs the correct formats	Incomplete
I have written necessary rustdoc comments	Incomplete
I have added necessary unit tests and integration tests	Incomplete
I have added test labels as necessary. See details.	Incomplete
I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features #7934).	Incomplete
My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).	Incomplete
All checks passed in `./risedev check` (or alias, `./risedev c`)	Incomplete
My PR contains critical fixes that are necessary to be merged into the latest release. (Please check out the details)	Incomplete
My PR needs documentation updates. (Please use the Release note section below to summarize the impact on users)	Incomplete