planner: create a separate unified function to update variables for statistics sctx

[qw4990]

What problem does this PR solve?

Issue Number: ref #46905

Problem Summary: planner: create a separate unified function to update variables for statistics sctx

What is changed and how it works?

planner: create a separate unified function to update variables for statistics sctx

The goal is to use this function to remove h.mu.ctx later on:

Check List

Tests

• 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

[tiprow]

Hi @qw4990. Thanks for your PR.

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[codecov]

Codecov Report

Merging #47051 (a6b7bd1) into master (35add6f) will decrease coverage by 0.3390%.
Report is 3 commits behind head on master.
The diff coverage is 60.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47051        +/-   ##
================================================
- Coverage   73.0786%   72.7396%   -0.3390%     
================================================
  Files          1336       1357        +21     
  Lines        398226     404683      +6457     
================================================
+ Hits         291018     294365      +3347     
- Misses        88467      91664      +3197     
+ Partials      18741      18654        -87     

Flag	Coverage Δ
integration	30.5247% <49.0909%> (?)
unit	73.1179% <60.0000%> (+0.0393%)	⬆️

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

Components	Coverage Δ
dumpling	53.9913% <ø> (ø)
parser	84.9980% <ø> (+0.0107%)	⬆️
br	48.8713% <ø> (-4.0687%)	⬇️

[Rustin170506]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-18 08:03:07.932552769 +0000 UTC m=+504553.900140810: ☑️ agreed by winoros.
• 2023-09-18 08:09:26.356467238 +0000 UTC m=+504932.324055286: ☑️ agreed by hi-rustin.

[easonn7]

/approve

There is no sysvar change.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: easonn7, hawkingrei, hi-rustin, winoros

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Needs approval from an approver in each of these files:

• OWNERS [hawkingrei,hi-rustin,winoros]
• sessionctx/variable/OWNERS [easonn7]

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