[vaidikgarg-bit]

Purpose of the PR

• follow-up to fix(store): stop ProjectionStage clearing dedup keys in place #3408 (issue [Bug] Store limit dedup emits duplicates on id-only scans because ProjectionStage mutates the stored column #3407)

The tests in #3408 call ProjectionStage directly, so they would still pass if QueryUtil.buildPlan stopped adding the projection for a null_property request or initialized it without removeAllProperty. This adds one case that runs MapLimitIterator output through the plan the server builds, checking that id-only rows come back with an empty value and that the limit dedup still drops repeated keys on that path.

Main Changes

• ProjectionStageTest.testLimitDedupStillDropsCopiesThroughIdOnlyPlan: builds the plan with QueryUtil.buildPlan for a request with sample_factor = 1.0 and null_property = true, asserts it is QueryPlan{stages=[PROJECTION_STAGE]}, feeds MapLimitIterator output through plan.execute(...) one row at a time, and checks that each of 100 keys comes out once with an empty value.

sample_factor is set because its proto default, 0.0, builds a stop-only plan.

No production code changes.

Verifying these changes

• Trivial rework / code cleanup without any test coverage. (No Need)
• Already covered by existing tests, such as (please modify tests here).
• Need tests and can be verified as follows:
  • mvn test -pl hugegraph-store/hg-store-test -am -P store-server-test -Dtest=ProjectionStageTest -Dsurefire.failIfNoSpecifiedTests=false: 3 tests pass. With ProjectionStage.java reverted to its state before fix(store): stop ProjectionStage clearing dedup keys in place #3408, all three fail: the new test and testLimitDedupStillDropsCopiesAfterProjection with key 0 emitted twice, and testRemoveAllPropertyLeavesInputColumnUnchanged on its assertSame. If buildPlan stops adding the projection, only the new test fails.
  • mvn test -pl hugegraph-store/hg-store-test -am -P store-server-test: 183 tests, 0 failures.
  • mvn editorconfig:check -pl hugegraph-store/hg-store-test -am passes.

Does this PR potentially affect the following parts?

• Dependencies (add/update license info & regenerate_known_dependencies.sh)
• Modify configurations
• The public API
• Other affects (typed here)
• Nope

Documentation Status

• Doc - TODO: required documentation is pending; complete it before merging.
• Doc - Done: documentation is included here or linked below.
• Doc - No Need: no user-visible documentation is affected.

Documentation files in this PR or paired hugegraph-doc PR:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.28%. Comparing base (608cb1d) to head (0ecf770).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3410      +/-   ##
============================================
+ Coverage     57.27%   57.28%   +0.01%     
+ Complexity     6577     2395    -4182     
============================================
  Files           776      776              
  Lines         68881    68876       -5     
  Branches       9431     9431              
============================================
+ Hits          39449    39454       +5     
+ Misses        25804    25793      -11     
- Partials       3628     3629       +1     

Flag	Coverage Δ		*Carryforward flag
commons	96.37% <ø> (ø)		Carriedforward from 608cb1d
hstore	36.11% <ø> (+0.02%)	⬆️
pd	52.17% <ø> (+<0.01%)	⬆️	Carriedforward from 608cb1d
server_hbase	42.18% <ø> (ø)		Carriedforward from 608cb1d
server_memory	55.98% <ø> (ø)		Carriedforward from 608cb1d
server_rocksdb	42.65% <ø> (ø)		Carriedforward from 608cb1d
store	33.12% <ø> (-0.03%)	⬇️

*This pull request uses carry forward flags. Click here to find out more.

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[bitflicker64]

Blocking: no. Score: 9/10. Summary: The new case builds the plan through QueryUtil.buildPlan for an id-only request and fails if the projection is dropped, initialized without removeAllProperty, or mutates the column in place; ServerSuiteTest picks it up and the store-server-test CI run reports 183 tests passing.

[imbajin]

Blocking: no. Summary: The regression test exercises the id-only QueryUtil.buildPlan path and detects missing projection, incorrect property removal and mutation that breaks limit deduplication. Evidence: Three independent static reviews traced the plan, iterator hash semantics and ServerSuiteTest inclusion; exact-revision Store and HStore CI passed. No local Maven run was repeated. Score: 8.8/10.