[multistage][feature] Support a join b using(col)

[61yao]

Turns out this feature is already supported. Added a test to show that and increase test coverage.

[61yao]

@walterddr

[codecov-commenter]

Codecov Report

Merging #9373 (d1e1189) into master (334c978) will decrease coverage by 1.33%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #9373      +/-   ##
============================================
- Coverage     69.76%   68.42%   -1.34%     
- Complexity     4704     5070     +366     
============================================
  Files          1882     1884       +2     
  Lines        100155   100282     +127     
  Branches      15226    15253      +27     
============================================
- Hits          69874    68622    -1252     
- Misses        25344    26730    +1386     
+ Partials       4937     4930       -7     

Flag	Coverage Δ
integration1	26.06% <ø> (-0.14%)	⬇️
integration2	?
unittests1	66.94% <ø> (+0.03%)	⬆️
unittests2	15.31% <ø> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...t/core/plan/StreamingInstanceResponsePlanNode.java	0.00% <0.00%> (-100.00%)	⬇️
...ore/operator/streaming/StreamingResponseUtils.java	0.00% <0.00%> (-100.00%)	⬇️
...server/starter/helix/SegmentReloadStatusValue.java	0.00% <0.00%> (-100.00%)	⬇️
.../operator/blocks/results/MetadataResultsBlock.java	0.00% <0.00%> (-100.00%)	⬇️
...ager/realtime/PeerSchemeSplitSegmentCommitter.java	0.00% <0.00%> (-100.00%)	⬇️
...urces/ServerReloadControllerJobStatusResponse.java	0.00% <0.00%> (-100.00%)	⬇️
...ator/streaming/StreamingSelectionOnlyOperator.java	0.00% <0.00%> (-90.00%)	⬇️
...he/pinot/core/plan/StreamingSelectionPlanNode.java	0.00% <0.00%> (-88.89%)	⬇️
...che/pinot/common/auth/StaticTokenAuthProvider.java	0.00% <0.00%> (-87.50%)	⬇️
...roker/requesthandler/GrpcBrokerRequestHandler.java	0.00% <0.00%> (-86.96%)	⬇️
... and 166 more

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