[multistage] fix literal aggregate function not working issue

[walterddr]

No description provided.

[codecov-commenter]

Codecov Report

Merging #9331 (8ee7571) into master (6047b06) will increase coverage by 40.20%.
The diff coverage is 100.00%.

❗ Current head 8ee7571 differs from pull request most recent head 804f328. Consider uploading reports for the commit 804f328 to get more accurate results

@@              Coverage Diff              @@
##             master    #9331       +/-   ##
=============================================
+ Coverage     28.37%   68.57%   +40.20%     
- Complexity       53     5046     +4993     
=============================================
  Files          1867     1879       +12     
  Lines         99608    99971      +363     
  Branches      15167    15208       +41     
=============================================
+ Hits          28260    68556    +40296     
+ Misses        68608    26505    -42103     
- Partials       2740     4910     +2170     

Flag	Coverage Δ
integration1	26.14% <0.00%> (+0.02%)	⬆️
integration2	?
unittests1	67.11% <100.00%> (?)
unittests2	15.35% <100.00%> (?)

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

Impacted Files	Coverage Δ
...inot/query/runtime/operator/AggregateOperator.java	84.37% <100.00%> (+84.37%)	⬆️
...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%)	⬇️
... and 1349 more

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