ssimeonov commented on a change in pull request #23620: [SPARK-26696][SQL]
Makes Dataset encoder public
URL: https://github.com/apache/spark/pull/23620#discussion_r255358804
##########
File path: sql/core/src/test/scala/org/apache/spark/sql/DatasetSuite.scala
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@@ -139,6 +139,14 @@ class DatasetSuite extends QueryTest with
SharedSQLContext {
("a", 1), ("b", 2))
}
+ test("as tuple using instance encoder") {
+ val data = Seq(("a", 1), ("b", 2), ("c", 3))
+ val ds = data.toDS()
+ checkDataset(
+ ds.toDF().as[(String, Int)](ds.encoder),
Review comment:
This is one of the simplest contrived examples I can come up with. Is that
what you are looking for, used in a test?
```scala
def firstRowByGroup[A](groupBy: Column)(ds: Dataset[A]): Dataset[A] =
ds.groupBy(groupBy).agg(first(struct('*), ignoreNulls =
true).as("row")).select("row.*").as[A](ds.encoder)
```
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