*: memory is not allocated first if the user does not use some information from the table.

[zimulala]

What problem does this PR solve?

Issue Number: close #50077

Problem Summary:
If a large number of tables (such as the 540k table, 2850k partitions in the scenario shown in issue) are used, the OOM situation may occur.

What changed and how does it work?

Reduce memory allocation

• Do not create columns(PublicColumns, VisibleColumns, WritableColumns, FullHiddenColsAndVisibleColumns) for tables that are not used by users.
• Do preallocate for EncodeInt in EncodeTableIndexPrefix.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  Prior to this PR, OOM appeared every 20-30 minutes. After this PR memory is relatively stable without OOM (test 4h+).
  See the memory usage chart, memory reduction of about 2G.

Before this PR：

After this PR：

• 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 @zimulala. Thanks for your PR.

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[codecov]

Codecov Report

Merging #50062 (d1e6f2f) into master (354c186) will increase coverage by 30.1949%.
Report is 41 commits behind head on master.
The diff coverage is 7.6923%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #50062         +/-   ##
=================================================
+ Coverage   36.8806%   67.0756%   +30.1949%     
=================================================
  Files          2731       2553        -178     
  Lines        773730     845799      +72069     
=================================================
+ Hits         285357     567325     +281968     
+ Misses       463362     254616     -208746     
+ Partials      25011      23858       -1153     

Flag	Coverage Δ
integration	37.0446% <7.6923%> (?)
system	?
true	?
unit	79.2368% <7.6923%> (+7.3250%)	⬆️

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

Components	Coverage Δ
dumpling	73.6130% <ø> (+17.3001%)	⬆️
parser	∅ <ø> (∅)
br	71.8255% <ø> (+27.8064%)	⬆️

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-05 01:54:48.017266388 +0000 UTC m=+2394779.054493314: ☑️ agreed by Defined2014.
• 2024-01-05 07:17:35.451543806 +0000 UTC m=+2414146.488770734: ☑️ agreed by tiancaiamao.

[zimulala]

/test check-dev2

[tiprow]

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In response to this:

/test check-dev2

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Defined2014, tangenta, tiancaiamao

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Needs approval from an approver in each of these files:

• pkg/ddl/OWNERS [tangenta]
• pkg/table/OWNERS [tangenta]
• pkg/tablecodec/OWNERS [tangenta]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #50166.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #50169.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #50171.