Expose the query executor init config via QueryExecutor#getQueryExecutorConfig

[gortiz]

Summary

Adds QueryExecutor#getQueryExecutorConfig() so callers can read the PinotConfiguration the executor was initialized with (the pinot.server.query.executor subset).

• New interface method with a default that returns an empty PinotConfiguration (back-compatible for any implementation that does not track its init config).
• ServerQueryExecutorV1Impl retains the config passed to init(...) and returns it.

Motivation

A caller that supplies a per-execution PlanMaker override (the execute(..., PlanMaker) overload) currently has no way to obtain the executor's configuration, so it cannot initialize that PlanMaker with the same settings the executor's own plan maker uses. As a result the override silently falls back to InstancePlanMakerImplV2 defaults and ignores server limits such as max.execution.threads and the group-by trim sizes. This accessor lets such an override be initialized from the executor's real config.

Compatibility

Purely additive: a new default interface method plus a stored field and getter. No existing signatures change and no behavior changes for current callers.

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.78%. Comparing base (2103aa2) to head (c79feec).

Files with missing lines	Patch %	Lines
...pache/pinot/core/query/executor/QueryExecutor.java	0.00%	1 Missing ⚠️
...core/query/executor/ServerQueryExecutorV1Impl.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #18886      +/-   ##
============================================
+ Coverage     64.77%   64.78%   +0.01%     
  Complexity     1318     1318              
============================================
  Files          3393     3393              
  Lines        211559   211562       +3     
  Branches      33283    33283              
============================================
+ Hits         137029   137071      +42     
+ Misses        63458    63415      -43     
- Partials      11072    11076       +4     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (ø)
integration	100.00% <ø> (ø)
integration1	100.00% <ø> (ø)
integration2	0.00% <ø> (ø)
java-21	64.78% <33.33%> (+0.01%)	⬆️
temurin	64.78% <33.33%> (+0.01%)	⬆️
unittests	64.78% <33.33%> (+0.01%)	⬆️
unittests1	56.97% <33.33%> (-0.01%)	⬇️
unittests2	37.14% <33.33%> (+0.02%)	⬆️

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