parser: Don't support parser sql like t. [reservedKeyWord]

[Defined2014]

What problem does this PR solve?

Issue Number: close #46778

Problem Summary: see #46778 (comment), I think it's a strange behavior in MySQL, not sure we should follow it or not.

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

Hi @Defined2014. Thanks for your PR.

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[Defined2014]

/hold
hold it, until some users need it.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

Merging #46789 (3ddc49c) into master (d3d30f5) will decrease coverage by 0.6313%.
Report is 1485 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #46789        +/-   ##
================================================
- Coverage   73.3326%   72.7013%   -0.6313%     
================================================
  Files          1322       1343        +21     
  Lines        396474     402764      +6290     
================================================
+ Hits         290745     292815      +2070     
- Misses        87208      91381      +4173     
- Partials      18521      18568        +47     

Flag	Coverage Δ
integration	27.7404% <ø> (?)
unit	73.3233% <100.0000%> (-0.0094%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	54.0444% <ø> (ø)
parser	84.9755% <100.0000%> (+0.0037%)	⬆️
br	48.3097% <ø> (-4.3321%)	⬇️

[Defined2014]

/retest

[tiprow]

@Defined2014: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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/retest

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[hawkingrei]

/ok-to-test

[ti-chi-bot]

PR needs rebase.

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[ti-chi-bot]

@Defined2014: 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	3ddc49c	link	true	/test build
idc-jenkins-ci-tidb/mysql-test	3ddc49c	link	true	/test mysql-test
idc-jenkins-ci-tidb/unit-test	3ddc49c	link	true	/test unit-test
idc-jenkins-ci-tidb/check_dev	3ddc49c	link	true	/test check-dev
pull-integration-ddl-test	3ddc49c	link	true	/test pull-integration-ddl-test
idc-jenkins-ci-tidb/check_dev_2	3ddc49c	link	true	/test check-dev2
pull-mysql-client-test	3ddc49c	link	true	/test pull-mysql-client-test

Full PR test history. Your PR dashboard.

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