viirya opened a new pull request #25012: [SPARK-28215][SQL][R] as_tibble was 
removed from Arrow R API
URL: https://github.com/apache/spark/pull/25012
 
 
   ## What changes were proposed in this pull request?
   
   New R api of Arrow has removed `as_tibble`. Arrow optimization for DataFrame 
in R doesn't work due to the change.
   
   This can be tested as below, after installing latest Arrow:
   
   ```
   ./bin/sparkR --conf spark.sql.execution.arrow.sparkr.enabled=true
   ```
   
   ```
   > collect(createDataFrame(mtcars))
   ```
   
   Before this PR:
   ```
   > collect(createDataFrame(mtcars))
    Error in get("as_tibble", envir = asNamespace("arrow")) :
      object 'as_tibble' not found
   ```
   
   ```
   > collect(createDataFrame(mtcars))
        mpg cyl  disp  hp drat    wt  qsec vs am gear carb
        1  21.0   6 160.0 110 3.90 2.620 16.46  0  1    4    4
        2  21.0   6 160.0 110 3.90 2.875 17.02  0  1    4    4
        3  22.8   4 108.0  93 3.85 2.320 18.61  1  1    4    1
        ...
   ```
   
   ## How was this patch tested?
   
   Manual test.

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