executor: remove HashJoinV2Exec.needUsedFlag()

[windtalker]

What problem does this PR solve?

Issue Number: close #54755

Problem Summary:

In HashJoinV2Exec, there is a method needUsedFlag, which means if the row entry need to reserve a piece of memory to hold used flag, if yes, then during probe stage, if a build row is matched, its used flag will be set to true. This used flag is only used for join probe that need to scan the row table after probe is done.
In BaseJoinProbe, there is an interface NeedScanRowTable, which will return true if current join probe need to scan the row table after probe is done. So basically, needUsedFlag and NeedScanRowTable is the same thing. The pr remove needUsedFlag

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.

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 @windtalker. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.0483%. Comparing base (eab8700) to head (41d385c).
Report is 14 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #54766         +/-   ##
=================================================
- Coverage   72.8969%   56.0483%   -16.8487%     
=================================================
  Files          1552       1676        +124     
  Lines        437298     614213     +176915     
=================================================
+ Hits         318777     344256      +25479     
- Misses        98999     246429     +147430     
- Partials      19522      23528       +4006     

Flag	Coverage Δ
integration	37.2672% <0.0000%> (?)
unit	71.7644% <100.0000%> (-0.1719%)	⬇️

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Components	Coverage Δ
dumpling	52.9656% <ø> (ø)
parser	∅ <ø> (∅)
br	52.5417% <ø> (+6.6470%)	⬆️

[xzhangxian1008]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: wshwsh12, xzhangxian1008

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-07-21 04:43:21.94491262 +0000 UTC m=+761023.935854088: ☑️ agreed by wshwsh12.
• 2024-07-22 01:24:23.918659536 +0000 UTC m=+835485.909601005: ☑️ agreed by xzhangxian1008.