planner: fix `count(*)` return wrong value for `information_schema.tables` (#57506)

[ti-chi-bot]

This is an automated cherry-pick of #57506

What problem does this PR solve?

Issue Number: close #56987

Problem Summary:

InfoSchemaBaseExtractor wrongly filter table names for the fast path introduced by https://github.com/pingcap/tidb/pull/55574

What changed and how does it work?

Introduce a new variable extractLowerString to dertermine whether to do case-insensitive comparisons for specific columns.

Test case is not added in integration test because we don't want to write some hardcoded value. (ref #57306)

Check List

Tests

• [X] Unit test
• [ ] Integration test
• [ ] Manual test (add detailed scripts or steps below)
• [ ] No need to test

  • [ ] I checked and no code files have been changed.

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

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, hawkingrei

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/pingcap/tidb/blob/release-8.5/OWNERS)~~ [Benjamin2037,hawkingrei] - ~~[pkg/planner/OWNERS](https://github.com/pingcap/tidb/blob/release-8.5/pkg/planner/OWNERS)~~ [hawkingrei] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-11-20 08:02:09.491580771 +0000 UTC m=+18717.111235287: :ballot_box_with_check: agreed by Benjamin2037.
• 2024-11-20 08:02:20.093808079 +0000 UTC m=+18727.713462595: :ballot_box_with_check: agreed by hawkingrei.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Please upload report for BASE (release-8.5@03a5897). Learn more about missing BASE report.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release-8.5 #57549 +/- ## ================================================ Coverage ? 56.8208% ================================================ Files ? 1770 Lines ? 625980 Branches ? 0 ================================================ Hits ? 355687 Misses ? 246236 Partials ? 24057 ``` | [Flag](https://app.codecov.io/gh/pingcap/tidb/pull/57549/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [integration](https://app.codecov.io/gh/pingcap/tidb/pull/57549/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `36.6959% <100.0000%> (?)` | | | [unit](https://app.codecov.io/gh/pingcap/tidb/pull/57549/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `72.5106% <100.0000%> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap#carryforward-flags-in-the-pull-request-comment) to find out more. | [Components](https://app.codecov.io/gh/pingcap/tidb/pull/57549/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [dumpling](https://app.codecov.io/gh/pingcap/tidb/pull/57549/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `52.9478% <0.0000%> (?)` | | | [parser](https://app.codecov.io/gh/pingcap/tidb/pull/57549/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `∅ <0.0000%> (?)` | | | [br](https://app.codecov.io/gh/pingcap/tidb/pull/57549/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `52.3160% <0.0000%> (?)` | |

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[joechenrh]

/retest