fix: fix join exit check

[Yisaer]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 64.06%. Comparing base (e145dee) to head (c497c25).
Report is 4 commits behind head on master.

Files	Patch %	Lines
internal/topo/operator/join_operator.go	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2695      +/-   ##
==========================================
- Coverage   64.06%   64.06%   -0.00%     
==========================================
  Files         329      329              
  Lines       38468    38479      +11     
==========================================
+ Hits        24643    24650       +7     
- Misses      11656    11660       +4     
  Partials     2169     2169              

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