Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/3594#discussion_r109262692 --- Diff: flink-libraries/flink-table/src/test/scala/org/apache/flink/table/TableEnvironmentTest.scala --- @@ -335,7 +335,8 @@ class TableEnvironmentTest extends TableTestBase { val table2 = util.addTable[(Long, Int, String)]('d, 'e, 'f) - val sqlTable2 = util.tEnv.sql(s"SELECT d, e, f FROM $table2 UNION SELECT a, b, c FROM $table") + val sqlTable2 = util.tEnv.sql(s"SELECT d, e, f FROM $table2 " + + s"UNION ALL SELECT a, b, c FROM $table") --- End diff -- Why did you change `UNION` to `UNION ALL`?
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