Fixed #4953 MySqlStatementParser解析create procedure存储过程时,case when语句处理异常

[Junge-401]

No description provided.

[Junge-401]

#4953

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.95%. Comparing base (d92126a) to head (948501f).
⚠️ Report is 1035 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4956      +/-   ##
============================================
+ Coverage     58.94%   58.95%   +0.01%     
- Complexity    26910    26913       +3     
============================================
  Files          1268     1268              
  Lines        122755   122757       +2     
  Branches      23123    23124       +1     
============================================
+ Hits          72355    72371      +16     
+ Misses        41381    41366      -15     
- Partials       9019     9020       +1     

Files with missing lines	Coverage Δ
...sql/dialect/mysql/parser/MySqlStatementParser.java	63.32% <100.00%> (+0.16%)	⬆️
.../sql/dialect/mysql/visitor/MySqlOutputVisitor.java	59.63% <100.00%> (+0.04%)	⬆️

... and 5 files with indirect coverage changes

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