Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21100#discussion_r183295681
--- Diff: sql/core/src/test/resources/sql-tests/inputs/union.sql ---
@@ -35,6 +35,11 @@ FROM (SELECT col AS col
SELECT col
FROM p3) T1) T2;
+-- SPARK-24012 Union of map and other compatible columns.
+SELECT map(1, 2), 'str'
--- End diff --
shall we also add a test for array?
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