Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/10388#discussion_r48199310
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameNaFunctionsSuite.scala ---
@@ -194,4 +194,45 @@ class DataFrameNaFunctionsSuite extends QueryTest with
SharedSQLContext {
assert(out1(4) === Row("Amy", null, null))
assert(out1(5) === Row(null, null, null))
}
+
+ test("Spark-12231: dropna with partitionBy and groupBy") {
+ withTempPath { dir =>
+ val df = sqlContext.range(10)
+ val df1 = df.withColumn("a", $"id".cast("int"))
+ df1.write.partitionBy("id").parquet(dir.getCanonicalPath)
+ val df2 = sqlContext.read.parquet(dir.getCanonicalPath)
+ val group = df2.na.drop().groupBy().count().collect()
--- End diff --
This file is not a great example of this, but we should always use
`checkAnswer` in unit tests because it provides much better failure messages
than the default ScalaTest asserts.
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