[PR] [FIX](map/struct) fix shrink char column in map/struct [doris]

[via GitHub]

amorynan opened a new pull request, #25725:
URL: https://github.com/apache/doris/pull/25725

   ## Proposed changes
   
   Issue Number: close #xxx
    fix shrink char column in map/struct
   before we has char with specific length defined in map or struct field 
   we select map or struct , the char column in which one has been padding if 
we just insert less than specific length chars
   but in mysql here just show inserted chars not padding specific length chars
   like :
   
![img_v2_d5def0f1-ad9a-4e9d-89e7-bf8b2e2eeb0g](https://github.com/apache/doris/assets/18551114/76cefd0b-8bd6-48e5-8cad-d511e0678f04)
   
   after 
   
![image](https://github.com/apache/doris/assets/18551114/568ae2ab-eed6-41ef-a285-a660e826078d)
   
   <!--Describe your changes.-->
   
   ## Further comments
   
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