Github user ggupta81 commented on the pull request:
https://github.com/apache/spark/pull/7928#issuecomment-129711909
@yhuai How to attach a testcase. I could not find the instructions on:
https://cwiki.apache.org/confluence/display/SPARK/Contributing+to+Spark#ContributingtoSpark-PullRequest
Here is the command line script to test:
import sqlContext.implicits._
import org.apache.spark.sql.Row;
import org.apache.spark.sql.types.{StructType,StructField,StringType};
val schemaString = "name age"
val schema = StructType( schemaString.split(" ").map(fieldName =>
StructField(fieldName, StringType, true)))
val rdd = sc.parallelize(List( Row("Micheal","31"), Row("Micheal", "30"),
Row("Micheal", "28"), Row("Micheal", "32"), Row("Andy", "30"), Row("Andy",
"31") , Row("Andy", "27"), Row("Justin", "19")), 1)
val df = sqlContext.createDataFrame(rdd, schema)
df.cache
df.registerTempTable("df")
sqlContext.sql("SELECT name,last(age) FROM df GROUP BY name").show()
The result is:
+-------+--+
| name|c1|
+-------+--+
| Andy|19|
| Justin|19|
|Micheal|19|
+-------+--+
whereas it should be:
+-------+--+
| name|c1|
+-------+--+
| Andy|27|
| Justin|19|
|Micheal|32|
+-------+--+
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