bp #42882#43246#43336
We pick these PRs together because they all fix one problem and if not
do so, the regression test won't be passed.
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Co-authored-by: Sun Chenyang <csun5285@gmail.com>
Co-authored-by: qidaye <luen@selectdb.com>
### What problem does this PR solve?
pick #43000
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Problem Summary:
### Check List (For Committer)
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- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
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nereids will parse function statement when replay create alias function,
when do parse, need to get sql mode and other variable. because replay
thread do not have connect context, NPE be thrown when parsing
### What problem does this PR solve?
Problem Summary:
There is a memory leak on FE side when continue running `export`
command.
The `ExportTaskExecutor` instances will be added to
`TransientTaskManager` and never be removed.
This PR mainly changes:
1. Remove unused `ExportTaskRegister` in `Env`.
2. Remove `ExportTaskExecutor` from `TransientTaskManager` once export
job is finished or cancelled.
### Release note
Fix FE memory leak by removing `ExportTaskExecutor` from
`TransientTaskManager` once export job is finished or cancelled.
