fix showQueries

[shuwenwei]

Description

1. Using limit when there are multiple datanodes will result in NPE.
2. Fixed issues with using order by queryid, datanodeid, elapsedtime, statement as sortKeys.
3. Fixed the issue of incorrect read order during deserialization.
4. An extra : appears in Estimated Memory Size:.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.88%. Comparing base (bd813d8) to head (b0a6e00).
⚠️ Report is 7 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #16855      +/-   ##
============================================
+ Coverage     38.83%   38.88%   +0.04%     
  Complexity      207      207              
============================================
  Files          5021     5021              
  Lines        332995   333030      +35     
  Branches      42376    42382       +6     
============================================
+ Hits         129322   129502     +180     
+ Misses       203673   203528     -145     

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud