planner/preprocessor: disallow into-outfile clause in some place

[tangenta]

What problem does this PR solve?

Issue Number: Part of #19097.

Problem Summary: For details, see #19097.

What is changed and how it works?

What's Changed:

• Add an error ErrMisplacedIntoOutfile(3954).
• Validate the 'into outfile' option. This clause is only allowed in the last select statement in union.

How it Works: Omitted.

Related changes

N/A

Check List

Tests

• Unit test
• Integration test

Side effects

N/A

Release note

• No release note

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Warning: None

[ti-chi-bot]

@tangenta: PR needs rebase.

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[codecov]

Codecov Report

Merging #21956 (24e1b14) into master (933e456) will increase coverage by 0.0022%.
Report is 9981 commits behind head on master.
The diff coverage is 94.4444%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #21956        +/-   ##
================================================
+ Coverage   76.8763%   76.8786%   +0.0022%     
================================================
  Files           572        572                
  Lines        144990     145026        +36     
================================================
+ Hits         111463     111494        +31     
- Misses        23484      23487         +3     
- Partials      10043      10045         +2     

[ti-chi-bot]

@tangenta: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/build	24e1b14	link	true	/test build
idc-jenkins-ci-tidb/unit-test	24e1b14	link	true	/test unit-test
idc-jenkins-ci-tidb/check_dev	24e1b14	link	true	/test check-dev
pull-mysql-client-test	24e1b14	link	true	/test pull-mysql-client-test
idc-jenkins-ci-tidb/check_dev_2	24e1b14	link	true	/test check-dev2
pull-integration-ddl-test	24e1b14	link	true	/test pull-integration-ddl-test
idc-jenkins-ci-tidb/mysql-test	24e1b14	link	true	/test mysql-test
pull-br-integration-test	24e1b14	link	true	/test pull-br-integration-test
pull-lightning-integration-test	24e1b14	link	true	/test pull-lightning-integration-test
pull-integration-e2e-test	24e1b14	link	true	/test pull-integration-e2e-test

Full PR test history. Your PR dashboard.

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