Planner: automatically inline CTE when only 1 consumer use it

[dayicklp]

What problem does this PR solve?

Issue Number: close #36295

Problem Summary: We should automatically expand the CTE inline when the CTE query is only used once by the consumer

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

[ti-chi-bot]

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[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/b6e95a30d806392bca7e1217d35a4b85013c2f6d

[ti-chi-bot[bot]]

PR needs rebase.

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[codecov[bot]]

Codecov Report

Merging #36992 (b6e95a3) into master (fbbae46) will increase coverage by 11.9544%. Report is 5512 commits behind head on master. The diff coverage is 100.0000%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #36992         +/-   ##
=================================================
+ Coverage   61.8719%   73.8263%   +11.9544%     
=================================================
  Files           891        990         +99     
  Lines        284074     313709      +29635     
=================================================
+ Hits         175762     231600      +55838     
+ Misses        94536      67522      -27014     
- Partials      13776      14587        +811