docete opened a new pull request #9458: [FLINK-13651][table-planner-blink] 
Blink planner should parse char(n)/varchar(n)/decimal(p, s) inside a string to 
corresponding datatype
   ## What is the purpose of the change
   Blink planner should parse decimal(p,s)/char(n)/varchar(n) inside a string 
to corresponding datatype
   ## Brief change log
   - Refactor PlannerExpressionParserImpl for not using TypeInformation
   - Support parse decimal(p, s) inside a string to datatype
   - Support parse char(n) inside a string to datatype
   - Support parse varchar(n) inside a string to datatype
   ## Verifying this change
   This change is already covered by existing tests, such as 
   ## Does this pull request potentially affect one of the following parts:
     - Dependencies (does it add or upgrade a dependency): (yes / **no**)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (yes / **no**)
     - The serializers: (yes / **no** / don't know)
     - The runtime per-record code paths (performance sensitive): (yes / **no** 
/ don't know)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know)
     - The S3 file system connector: (yes / **no** / don't know)
   ## Documentation
     - Does this pull request introduce a new feature? (yes / **no**)
     - If yes, how is the feature documented? (**not applicable** / docs / 
JavaDocs / not documented)

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