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

Base: 58.94% // Head: 58.95% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (948501f) compared to base (d92126a).
Patch coverage: 100.00% of modified lines in pull request are covered.

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     

Impacted Files	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%)	⬆️
.../java/com/alibaba/druid/util/JdbcSqlStatUtils.java	58.62% <0.00%> (-3.45%)	⬇️
...n/java/com/alibaba/druid/filter/FilterManager.java	67.07% <0.00%> (-2.44%)	⬇️
.../main/java/com/alibaba/druid/stat/JdbcSqlStat.java	81.77% <0.00%> (-0.71%)	⬇️
...n/java/com/alibaba/druid/pool/DruidDataSource.java	72.07% <0.00%> (+0.09%)	⬆️
...rc/main/java/com/alibaba/druid/util/JdbcUtils.java	54.29% <0.00%> (+1.54%)	⬆️

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