Jefffrey opened a new pull request, #18754:
URL: https://github.com/apache/datafusion/pull/18754

   ## Which issue does this PR close?
   
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   Part of #12725
   
   ## Rationale for this change
   
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   Started refactoring encoding functions (`encode`, `decode`) to remove user 
defined signature (per linked issue). However, discovered in the process it was 
bugged in handling of certain inputs. For example on main we get these errors:
   
   ```sql
   DataFusion CLI v51.0.0
   > select encode(arrow_cast(column1, 'LargeUtf8'), 'hex') from values ('a'), 
('b');
   Internal error: Function 'encode' returned value of type 'Utf8' while the 
following type was promised at planning time and expected: 'LargeUtf8'.
   This issue was likely caused by a bug in DataFusion's code. Please help us 
to resolve this by filing a bug report in our issue tracker: 
https://github.com/apache/datafusion/issues
   > select encode(arrow_cast(column1, 'LargeBinary'), 'hex') from values 
('a'), ('b');
   Internal error: Function 'encode' returned value of type 'Utf8' while the 
following type was promised at planning time and expected: 'LargeUtf8'.
   This issue was likely caused by a bug in DataFusion's code. Please help us 
to resolve this by filing a bug report in our issue tracker: 
https://github.com/apache/datafusion/issues
   > select encode(arrow_cast(column1, 'BinaryView'), 'hex') from values ('a'), 
('b');
   Error during planning: Execution error: Function 'encode' user-defined 
coercion failed with "Error during planning: 1st argument should be Utf8 or 
Binary or Null, got BinaryView" No function matches the given name and argument 
types 'encode(BinaryView, Utf8)'. You might need to add explicit type casts.
           Candidate functions:
           encode(UserDefined)
   ```
   
   - LargeUtf8/LargeBinary array inputs are broken
   - BinaryView input not supported (but Utf8View input is supported)
   
   So went about fixing this input handling as well as doing various refactors 
to try simplify the code.
   
   (I also discovered #18746 in the process of this refactor).
   
   ## What changes are included in this PR?
   
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   ## Are these changes tested?
   
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   Added new SLTs.
   
   ## Are there any user-facing changes?
   
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updated before approving the PR.
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   No.
   
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