Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/19363#discussion_r144753514 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/QueryTest.scala --- @@ -46,6 +36,20 @@ abstract class QueryTest extends PlanTest { Locale.setDefault(Locale.US) /** + * Makes sure the answer matches the expected result + */ + def checkString(expected: String, actual: String): Unit = { + if (expected != actual) { + fail( + "The actual string gives wrong result:\n\n" + sideBySide( --- End diff -- it's kind of an overkill, the `toString` we are testing always return a single line, just `assert` is enough.
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