planner: Removed check for prepared stmt during partition pruning

[mjonss]

What problem does this PR solve?

Issue Number: close #55630

Problem Summary:
Prepared statements would always fail partition pruning due to being a prepared statement and parameters not being considered to be constant.

What changed and how does it work?

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.

Manual test, see #55630, i.e. using sysbench.

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 @mjonss. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.2899%. Comparing base (ae59dfe) to head (fc3877c).
Report is 175 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #55631         +/-   ##
=================================================
- Coverage   72.9705%   59.2899%   -13.6807%     
=================================================
  Files          1581       1766        +185     
  Lines        442751     661944     +219193     
=================================================
+ Hits         323078     392466      +69388     
- Misses        99897     245973     +146076     
- Partials      19776      23505       +3729     

Flag	Coverage Δ
integration	40.6178% <ø> (?)
unit	75.3289% <ø> (+3.2759%)	⬆️

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

Components	Coverage Δ
dumpling	54.5253% <ø> (+1.5686%)	⬆️
parser	∅ <ø> (∅)
br	54.8419% <ø> (+8.8893%)	⬆️

[mjonss]

Some investigation results:
The removed code was added in #22452 and then in #22953 a related changed required to only allow a single column in the partitioning expression for pruning (COLUMNS partitioning still allows multiple columns, but not as expressions, just direct column references). And in #49161 the partitioning column will be updated for each execution of prepared statements, so it is safe even for executing from the plan cache.
So all-in-all removing this piece of code should be safe (and passes all tests).

[mjonss]

Any tips on how to create a test for this? EXPLAIN FOR CONNECTION will not show partitioning pruning (#55669).

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Defined2014, qw4990

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• pkg/planner/OWNERS [qw4990]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-28 09:42:59.867873391 +0000 UTC m=+949775.002323708: ☑️ agreed by Defined2014.
• 2024-09-20 06:30:25.242793814 +0000 UTC m=+1201894.983217754: ☑️ agreed by qw4990.

[tiprow]

@mjonss: 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
tidb_parser_test	fc3877c	link	true	/test tidb_parser_test
fast_test_tiprow	fc3877c	link	true	/test fast_test_tiprow

Full PR test history. Your PR dashboard.

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