Merge LastQueryScanNode of same device

[shuwenwei]

Description

Merge LastQueryScanNode of same device
For a scenario with 2 * 2 * 4 non-aligned devices and 80,000 measurement points per device.
When the last cache is hit, the optimization effect of executing the following SQL statement is:

select last * from root.db.aaaaaaa0.bbbbbbb0.**

Before this optimization:

After this optimization:

[codecov]

Codecov Report

Attention: Patch coverage is 51.55280% with 78 lines in your changes missing coverage. Please review.

Project coverage is 39.13%. Comparing base (f55dfe0) to head (c0ed35b).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ueryengine/plan/planner/OperatorTreeGenerator.java	0.00%	35 Missing ⚠️
...nner/plan/node/source/DeviceLastQueryScanNode.java	61.44%	32 Missing ⚠️
...b/queryengine/plan/planner/LogicalPlanBuilder.java	78.94%	4 Missing ⚠️
...ngine/plan/planner/plan/node/PlanGraphPrinter.java	0.00%	3 Missing ⚠️
...gine/plan/planner/distribution/SourceRewriter.java	81.81%	2 Missing ⚠️
...n/operator/process/last/LastQuerySortOperator.java	75.00%	1 Missing ⚠️
...eryengine/plan/planner/plan/node/PlanNodeType.java	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #15735      +/-   ##
============================================
- Coverage     39.14%   39.13%   -0.01%     
  Complexity      198      198              
============================================
  Files          4835     4834       -1     
  Lines        314405   314355      -50     
  Branches      39436    39425      -11     
============================================
- Hits         123067   123037      -30     
+ Misses       191338   191318      -20     

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[sonarqubecloud]

Quality Gate passed

Issues
14 New issues
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