83d0967dcc
### What changes were proposed in this pull request?
Change from `messages.toList.iterator` to `Iterator.single(messages.toList)`.
### Why are the changes needed?
In this test, the expected result of `rdd2.collect().head` should actually be `List("0", "1", "2", "3")` but is `"0"` now.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Updated test.
Thanks WeichenXu123 reported this problem.
Closes #28596 from Ngone51/fix_allgather_test.
Authored-by: yi.wu <yi.wu@databricks.com>
Signed-off-by: Xingbo Jiang <xingbo.jiang@databricks.com>
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