[jira] [Comment Edited] (SPARK-7435) Make DataFrame.show() consistent with that of Scala and pySpark

["Reynold Xin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-7435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14533478#comment-14533478 ] 

Reynold Xin edited comment on SPARK-7435 at 5/7/15 10:52 PM:
-------------------------------------------------------------

The problem with this is that `show` is a reserved keyword in R -- the show method gets called when you just type in the name of a variable. For example if we have 
{code}
> df <- jsonFile(sqlCtx, "./examples/src/main/resources/people.json")
> df
DataFrame[age:bigint, name:string]
{code}

So this print statement comes from `show` here and we should maintain this behavior as this is similar to the behavior in spark-shell, pyspark and is natural.
Actually I might be in favor of getting rid of `showDF` -- We already have `head` which does the same thing ?


was (Author: shivaram):
The problem with this is that `show` is a reserved keyword in R -- the show method gets called when you just type in the name of a variable. For example if we have 
```
> df <- jsonFile(sqlCtx, "./examples/src/main/resources/people.json")
> df
DataFrame[age:bigint, name:string]
```
So this print statement comes from `show` here and we should maintain this behavior as this is similar to the behavior in spark-shell, pyspark and is natural.
Actually I might be in favor of getting rid of `showDF` -- We already have `head` which does the same thing ?

> Make DataFrame.show() consistent with that of Scala and pySpark
> ---------------------------------------------------------------
>
>                 Key: SPARK-7435
>                 URL: https://issues.apache.org/jira/browse/SPARK-7435
>             Project: Spark
>          Issue Type: Improvement
>          Components: SparkR
>    Affects Versions: 1.4.0
>            Reporter: Sun Rui
>            Priority: Blocker
>
> Currently in SparkR, DataFrame has two methods show() and showDF(). show() prints the DataFrame column names and types and showDF() prints the first numRows rows of a DataFrame.
> In Scala and pySpark, show() is used to prints rows of a DataFrame. 
> We'd better keep API consistent unless there is some important reason. So propose to interchange the names (show() and showDF()) in SparkR.



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