doki23 commented on code in PR #45181:
URL: https://github.com/apache/spark/pull/45181#discussion_r1498639875
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sql/core/src/test/scala/org/apache/spark/sql/DatasetCacheSuite.scala:
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@@ -82,6 +82,26 @@ class DatasetCacheSuite extends QueryTest
assert(cached.storageLevel == StorageLevel.NONE, "The Dataset should not
be cached.")
}
+ test("SPARK-46992 collect before persisting") {
+ val ds = Seq(("a", 1), ("b", 2), ("c", 3)).toDS().select(expr("_2 +
1").as[Int])
+ // collect first
+ ds.collect()
+ // and then cache it
+ val cached = ds.cache()
+ // ds is not cached
+ assertNotCached(ds)
+ // Make sure, the Dataset is indeed cached.
+ assertCached(cached)
+
+ // Check result.
+ checkDataset(
+ cached,
+ 2, 3, 4)
Review Comment:
It makes sure that the cached data of the new `Dataset` instance is as
expected. I'll also add one more case that proves the results of
`cached.count()` and `cached.collect()` are consistent.
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