danny0405 opened a new pull request #13900:
URL: https://github.com/apache/flink/pull/13900


   ## What is the purpose of the change
   
   We should unescape the line delimiter characters first because the DDL can 
be read from a file. So that the new line "\n" in the DDL options was 
recognized as 2 characters.
   
   While what user want is actually the invisible new line character.
   
   ```sql
   create table t1(
     ...
   ) with (
     'format' = 'csv',
     'csv.line-delimiter' = '\n'
     ...
   )
   ```
   
   ## Brief change log
   
   *(for example:)*
     - unescape the line delimiter string first before setting
     - add test case
   
   
   ## Verifying this change
   
   Added UT.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): no
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: no
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? no
     - If yes, how is the feature documented? not documented
   


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