[GitHub] spark issue #17017: [SPARK-19682][SparkR] Issue warning (or error) when subs...

[actuaryzhang <gi...@git.apache.org>]

Github user actuaryzhang commented on the issue:

    https://github.com/apache/spark/pull/17017
  
    @felixcheung 
    Simple example to illustrate this
    ```
    df <- suppressWarnings(createDataFrame(iris))
    df[[1:2]]
    ```
    Instead of issuing warning and taking the first element, we can throw a more meaningful error message. Minor issue, but many R users may be accustomed to use vector index with `[[`. 


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