[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[asfgit]

Github user asfgit closed the pull request at:

https://github.com/apache/spark/pull/11267


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[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[shivaram]

Github user shivaram commented on the pull request:

https://github.com/apache/spark/pull/11267#issuecomment-195134060
  
Thanks @yanboliang -- Sorry for the delay in looking at this. I think this 
looks good. Merging to master


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[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[AmplabJenkins]

Github user AmplabJenkins commented on the pull request:

https://github.com/apache/spark/pull/11267#issuecomment-187001699
  
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[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[AmplabJenkins]

Github user AmplabJenkins commented on the pull request:

https://github.com/apache/spark/pull/11267#issuecomment-187001694
  
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[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[SparkQA]

Github user SparkQA commented on the pull request:

https://github.com/apache/spark/pull/11267#issuecomment-187001455
  
**[Test build #51656 has 
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/51656/consoleFull)**
 for PR 11267 at commit 
[`6e78f7c`](https://github.com/apache/spark/commit/6e78f7c4a6145a5be57b1133555b8a4172d90129).
 * This patch passes all tests.
 * This patch merges cleanly.
 * This patch adds no public classes.


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[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[SparkQA]

Github user SparkQA commented on the pull request:

https://github.com/apache/spark/pull/11267#issuecomment-186995268
  
**[Test build #51656 has 
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[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[yanboliang]

Github user yanboliang commented on a diff in the pull request:

https://github.com/apache/spark/pull/11267#discussion_r53583948
  
--- Diff: R/pkg/R/functions.R ---
@@ -536,15 +536,27 @@ setMethod("factorial",
 #'
 #' Aggregate function: returns the first value in a group.
 #'
+#' The function by default returns the first values it sees. It will 
return the first non-NA
+#' value it sees when ignoreNAs is set to true. If all values are NA, then 
NA is returned.
+#'
 #' @rdname first
 #' @name first
 #' @family agg_funcs
 #' @export
-#' @examples \dontrun{first(df$c)}
+#' @examples
+#' \dontrun{
+#' first(df$c)
+#' first(df$c, TRUE)
+#' }
 setMethod("first",
-  signature(x = "Column"),
-  function(x) {
-jc <- callJStatic("org.apache.spark.sql.functions", "first", 
x@jc)
+  signature(x = "characterOrColumn"),
+  function(x, ignoreNAs = FALSE) {
--- End diff --

Make sense, I will update. Thanks!


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[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[yanboliang]

Github user yanboliang commented on the pull request:

https://github.com/apache/spark/pull/11267#issuecomment-186993289
  
@shivaram Several R packages have similar function such as 
[first](http://www.inside-r.org/packages/cran/pastecs/docs/first), 
[aggregate](http://www.inside-r.org/r-doc/stats/aggregate), etc. Users need 
this feature in R and did some 
[workaround](http://stackoverflow.com/questions/28799753/how-to-select-the-last-one-test-without-na-in-r).
 


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[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[felixcheung]

Github user felixcheung commented on a diff in the pull request:

https://github.com/apache/spark/pull/11267#discussion_r53573356
  
--- Diff: R/pkg/R/functions.R ---
@@ -536,15 +536,27 @@ setMethod("factorial",
 #'
 #' Aggregate function: returns the first value in a group.
 #'
+#' The function by default returns the first values it sees. It will 
return the first non-NA
+#' value it sees when ignoreNAs is set to true. If all values are NA, then 
NA is returned.
+#'
 #' @rdname first
 #' @name first
 #' @family agg_funcs
 #' @export
-#' @examples \dontrun{first(df$c)}
+#' @examples
+#' \dontrun{
+#' first(df$c)
+#' first(df$c, TRUE)
+#' }
 setMethod("first",
-  signature(x = "Column"),
-  function(x) {
-jc <- callJStatic("org.apache.spark.sql.functions", "first", 
x@jc)
+  signature(x = "characterOrColumn"),
+  function(x, ignoreNAs = FALSE) {
--- End diff --

probably something like `na.rm=TRUE` would be more R like


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[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[shivaram]

Github user shivaram commented on the pull request:

https://github.com/apache/spark/pull/11267#issuecomment-186380904
  
Is this option used by base R / other R libraries like dplyr ? 


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[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[AmplabJenkins]

Github user AmplabJenkins commented on the pull request:

https://github.com/apache/spark/pull/11267#issuecomment-186134049
  
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[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[AmplabJenkins]

Github user AmplabJenkins commented on the pull request:

https://github.com/apache/spark/pull/11267#issuecomment-186134043
  
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[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[SparkQA]

Github user SparkQA commented on the pull request:

https://github.com/apache/spark/pull/11267#issuecomment-186133714
  
**[Test build #51546 has 
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/51546/consoleFull)**
 for PR 11267 at commit 
[`a30bd4a`](https://github.com/apache/spark/commit/a30bd4a34699dcec6aff3437080fd02583482a93).
 * This patch passes all tests.
 * This patch merges cleanly.
 * This patch adds no public classes.


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[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[SparkQA]

Github user SparkQA commented on the pull request:

https://github.com/apache/spark/pull/11267#issuecomment-186124658
  
**[Test build #51546 has 
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[GitHub] spark pull request: [SPARK-13389] [SparkR] SparkR support first/la...

[yanboliang]

GitHub user yanboliang opened a pull request:

https://github.com/apache/spark/pull/11267

[SPARK-13389] [SparkR] SparkR support first/last with ignore NAs

## What changes were proposed in this pull request?

SparkR support first/last with ignore NAs

cc @sun-rui @felixcheung @shivaram 

## How was the this patch tested?

unit tests




You can merge this pull request into a Git repository by running:

$ git pull https://github.com/yanboliang/spark spark-13389

Alternatively you can review and apply these changes as the patch at:

https://github.com/apache/spark/pull/11267.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

This closes #11267


commit a30bd4a34699dcec6aff3437080fd02583482a93
Author: Yanbo Liang 
Date:   2016-02-19T09:02:45Z

SparkR support first/last with ignore NAs




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