Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/8578#discussion_r38601580
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/columnar/InMemoryColumnarQuerySuite.scala
---
@@ -191,4 +191,13 @@ class InMemoryColumnarQuerySuite extends QueryTest
with SharedSQLContext {
ctx.table("InMemoryCache_different_data_types").collect())
ctx.dropTempTable("InMemoryCache_different_data_types")
}
+
+ test("SPARK-10422: String column in InMemoryColumnarCache needs to
override clone method") {
+ val df =
+ ctx.range(1, 30000).selectExpr("id % 500 as id").rdd.map(id =>
Tuple1(s"str_$id")).toDF("i")
+ val cached = df.cache()
+ // count triggers the caching action. It should not throw.
+ cached.count()
--- End diff --
Should we check the results?
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