Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18307#discussion_r125873943
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
---
@@ -712,6 +707,76 @@ class DataFrameSuite extends QueryTest with
SharedSQLContext {
checkAnswer(emptyDescription, emptyDescribeResult)
}
+ test("summary") {
+ val describeTestData = person2
+
+ val describeResult = Seq(
+ Row("count", "4", "4", "4"),
+ Row("mean", null, "33.0", "178.0"),
+ Row("stddev", null, "19.148542155126762", "11.547005383792516"),
+ Row("min", "Alice", "16", "164"),
+ Row("25%", null, "24.0", "176.0"),
+ Row("50%", null, "24.0", "176.0"),
+ Row("75%", null, "32.0", "180.0"),
+ Row("max", "David", "60", "192"))
+
+ val emptyDescribeResult = Seq(
+ Row("count", "0", "0", "0"),
+ Row("mean", null, null, null),
+ Row("stddev", null, null, null),
+ Row("min", null, null, null),
+ Row("25%", null, null, null),
+ Row("50%", null, null, null),
+ Row("75%", null, null, null),
+ Row("max", null, null, null))
+
+ def getSchemaAsSeq(df: DataFrame): Seq[String] = df.schema.map(_.name)
+
+ val describeTwoCols = describeTestData.summary()
+ assert(getSchemaAsSeq(describeTwoCols) === Seq("summary", "name",
"age", "height"))
+ checkAnswer(describeTwoCols, describeResult)
+ // All aggregate value should have been cast to string
+ describeTwoCols.collect().foreach { row =>
+ assert(row.get(2).isInstanceOf[String], "expected string but found "
+ row.get(2).getClass)
+ assert(row.get(3).isInstanceOf[String], "expected string but found "
+ row.get(3).getClass)
+ }
+
+ val describeAllCols = describeTestData.summary()
+ assert(getSchemaAsSeq(describeAllCols) === Seq("summary", "name",
"age", "height"))
+ checkAnswer(describeAllCols, describeResult)
+
+ val describeOneCol = describeTestData.select("age").summary()
+ assert(getSchemaAsSeq(describeOneCol) === Seq("summary", "age"))
+ checkAnswer(describeOneCol, describeResult.map { case Row(s, _, d, _)
=> Row(s, d)} )
+
+ val describeNoCol = describeTestData.select("name").summary()
--- End diff --
`describeNoCol`?
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