HyukjinKwon commented on a change in pull request #32167:
URL: https://github.com/apache/spark/pull/32167#discussion_r613933141
##########
File path: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
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@@ -404,6 +404,9 @@ class SQLQuerySuite extends QueryTest with
SharedSparkSession with AdaptiveSpark
checkAnswer(
sql("SELECT COALESCE(null, null, null)"),
Row(null))
+ checkAnswer(
+ sql("SELECT COALESCE(s, n) FROM nullStrings"),
Review comment:
I think this case is covered at least at
`sql/core/src/test/resources/sql-tests/inputs/outer-join.sql`
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