dongjoon-hyun commented on issue #23620: [SPARK-26696][SQL] Makes Dataset encoder public URL: https://github.com/apache/spark/pull/23620#issuecomment-462405179 @ssimeonov . It's partially true. > the test did not work before as it accessed a private property that this PR made public. @HyukjinKwon . The following was @ssimeonov 's test case. ``` 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), data: _*) } ``` The problem of @ssimeonov 's test case was that the following works . So, @gatorsmile and I had a doubt about that. ``` 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)], data: _*) } ``` What @ssimeonov is saying is that `ds.encoder` will not be parsed. In addition, @ssimeonov also suggested another example in the comment. But, we prefer to keep this PR simple.
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