Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/12736#discussion_r61311068
--- 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 --
Except apparently does not remove duplicates:
```scala
range(0, 10).registerTempTable("a")
range(5, 15).registerTempTable("b")
sql("(select * from a union all select * from a) except select * from b")
```
results in:
```
+---+
| id|
+---+
| 2|
| 2|
| 0|
| 0|
| 3|
| 3|
| 4|
| 4|
| 1|
| 1|
+---+
```
So that is weird.
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