Fix getMaxId won't get the right max id before GC

[jiaqizho]

What problem does this PR solve?

Issue Number: ref #3594

Problem Summary:

• When we del the page id
• In getMaxId won't now current page_id have been deleted

What is changed and how it works?

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
• lidezhu

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[lidezhu]

LGTM

[JaySon-Huang]

LGTM

[JaySon-Huang]

/merge

[ti-chi-bot]

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[ti-chi-bot]

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

Commit hash: 4840bac

[sre-bot]

Coverage for changed files

Filename                           Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
PageDirectory.cpp                      523                77    85.28%          31                 2    93.55%        1109               184    83.41%         404                92    77.23%
tests/gtest_page_directory.cpp        8974              1612    82.04%          51                 0   100.00%        1685                 7    99.58%        2814              1426    49.32%
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                 9497              1689    82.22%          82                 2    97.56%        2794               191    93.16%        3218              1518    52.83%

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
18091      10150            43.89%    200922  100977       49.74%

full coverage report (for internal network access only)

[jiaqizho]

need revert