Github user gatorsmile commented on the issue:

    https://github.com/apache/spark/pull/17848
  
    @zero323 
    - When `x` is non-deterministic, all the expressions that are derived from 
`x` (i.e., `y_i`, `z_i`, `v_i`) will be non-deterministic. 
    - When `x` is first materialized and computed, that means, the generated 
columns are deterministic. Thus, the results will be consistent.
    
    Not sure whether it answers your concern?


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