GitHub user aglinxinyuan added a comment to the discussion: A control-variable 
port on every operator: design and prototype

Control variables are values that can be passed between operators but are not 
part of the data itself. For example, you might want to filter records where 
`price < x`, with `x` supplied by an upstream operator as a control variable.

GitHub link: 
https://github.com/apache/texera/discussions/8915#discussioncomment-19052875

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