[I] Add a control-variable port to every operator [texera]

["aglinxinyuan (via GitHub)" <gi...@apache.org>]

aglinxinyuan opened a new issue, #8916:
URL: https://github.com/apache/texera/issues/8916

   ### Feature Summary
   
   An operator inside a loop cannot take a setting from a value computed upstream unless it has a second version built for that. For example, reading every file of a folder needs File Scan From Input, which takes the file name from a tuple field, instead of the File Scan operator itself.
   
   ### Proposed Solution or Design
   
   Give every operator one more input port, the **control-variable port**, drawn in purple. Whatever arrives on it becomes the operator's control variables, and a property that holds `$name` takes the value of the variable `name`. The port's input ends before the operator starts, so an edge into it is always materialized.
   
   ```
   Text Input ──► Loop Start ══(purple)══► File Scan (fileName = $file) ──► Loop End
   ```
   
   The design is discussed in https://github.com/apache/texera/discussions/8915.
   
   ### Affected Area
   
   Workflow Engine (Amber), Workflow UI
   


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Re: [I] Add a control-variable port to every operator [texera]

["aglinxinyuan (via GitHub)" <gi...@apache.org>]

aglinxinyuan commented on issue #8916:
URL: https://github.com/apache/texera/issues/8916#issuecomment-6049706021

   C:/Program Files/Git/take


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Re: [I] Add a control-variable port to every operator [texera]

["aglinxinyuan (via GitHub)" <gi...@apache.org>]

aglinxinyuan commented on issue #8916:
URL: https://github.com/apache/texera/issues/8916#issuecomment-6049713956

   /take


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