Storage: (Refactor) Separate segment impl out

[breezewish]

What problem does this PR solve?

Issue Number: ref #5831

Problem Summary:

What is changed and how it works?

Move internal segment operations impl into a standalone file.

• This PR is based on Storage: (Refactor) Separate ingest impl out #5832, so that merge it first to get a nicer diff.

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

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JaySon-Huang
• hongyunyan

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[hongyunyan]

LGTM

[breezewish]

/merge

[ti-chi-bot]

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 02a789c

[sre-bot]

Coverage for changed files

Filename                                Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
DeltaMergeStore.cpp                        1207               394    67.36%          58                 5    91.38%        1756               443    74.77%         618               246    60.19%
DeltaMergeStore_InternalSegment.cpp         413               213    48.43%           4                 0   100.00%         325                92    71.69%         110                67    39.09%
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                      1620               607    62.53%          62                 5    91.94%        2081               535    74.29%         728               313    57.01%

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
18708      8127             56.56%    216354  83570        61.37%

full coverage report (for internal network access only)