Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/12736#discussion_r61338330
--- Diff:
sql/core/src/test/java/test/org/apache/spark/sql/JavaDatasetSuite.java ---
@@ -291,7 +291,7 @@ public void testSetOperation() {
unioned.collectAsList());
Dataset<String> subtracted = ds.except(ds2);
- Assert.assertEquals(Arrays.asList("abc", "abc"),
subtracted.collectAsList());
+ Assert.assertEquals(Arrays.asList("abc"), subtracted.collectAsList());
--- End diff --
Uh, I see... Let me add a test case to cover it for ensuring it will not be
broken again
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