[GitHub] spark issue #16476: [SPARK-19084][SQL][WIP] Implement expression field

[chenghao-intel <gi...@git.apache.org>]

Github user chenghao-intel commented on the issue:

    https://github.com/apache/spark/pull/16476
  
    Since the different data type will be simply ignored, I think we'd better also add the optimization rule in `Optimizer`.
    
    As well as the python/scala API support, but need to confirm with @rxin, why we don't need the API `field`.


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