[SPARK-13841][SQL] Removes Dataset.collectRows()/takeRows()

## What changes were proposed in this pull request?

This PR removes two methods, `collectRows()` and `takeRows()`, from `Dataset[T]`. These methods were added in PR #11443, and were later considered not useful.

## How was this patch tested?

Existing tests should do the work.

Author: Cheng Lian <lian@databricks.com>

Closes #11678 from liancheng/remove-collect-rows-and-take-rows.

1 files changed, 1 insertions, 1 deletions

diff --git a/mllib/src/test/java/org/apache/spark/ml/feature/JavaVectorSlicerSuite.java b/mllib/src/test/java/org/apache/spark/ml/feature/JavaVectorSlicerSuite.java
index b87605ebfd..e2da11183b 100644
--- a/mllib/src/test/java/org/apache/spark/ml/feature/JavaVectorSlicerSuite.java
+++ b/mllib/src/test/java/org/apache/spark/ml/feature/JavaVectorSlicerSuite.java
@@ -78,7 +78,7 @@ public class JavaVectorSlicerSuite {
 
     Dataset<Row> output = vectorSlicer.transform(dataset);
 
-    for (Row r : output.select("userFeatures", "features").takeRows(2)) {
+    for (Row r : output.select("userFeatures", "features").takeAsList(2)) {
       Vector features = r.getAs(1);
       Assert.assertEquals(features.size(), 2);
     }