planner: Adjust the log level and returned value when cacheableChecker check *ast.TableName nodes (#46831)

[ti-chi-bot]

This is an automated cherry-pick of #46831

What problem does this PR solve?

Issue Number: close #46760

Problem Summary: planner: Adjust the log level and returned value when cacheableChecker check *ast.TableName nodes

What is changed and how it works?

planner: Adjust the log level and returned value when cacheableChecker check *ast.TableName nodes

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

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@ae6d59b). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #46876   +/-   ##
================================================
  Coverage               ?   73.6747%           
================================================
  Files                  ?       1084           
  Lines                  ?     348312           
  Branches               ?          0           
================================================
  Hits                   ?     256618           
  Misses                 ?      75225           
  Partials               ?      16469           

[YangKeao]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qw4990, YangKeao

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 [YangKeao,qw4990]

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]

[LGTM Timeline notifier]

Timeline:

• 2023-09-12 08:52:41.774966711 +0000 UTC m=+345743.699523102: ☑️ agreed by qw4990.
• 2023-09-12 09:19:07.473139341 +0000 UTC m=+347329.397695736: ☑️ agreed by YangKeao.