srielau commented on code in PR #45805:
URL: https://github.com/apache/spark/pull/45805#discussion_r1559582943


##########
sql/core/src/test/scala/org/apache/spark/sql/VariantSuite.scala:
##########
@@ -298,4 +300,28 @@ class VariantSuite extends QueryTest with 
SharedSparkSession {
     }
     assert(ex.getErrorClass == "DATATYPE_MISMATCH.INVALID_ORDERING_TYPE")
   }
+
+  test("variant_explode") {
+    def check(input: String, expected: Seq[Row]): Unit = {
+      withView("v") {
+        Seq(input).toDF("json").createOrReplaceTempView("v")
+        checkAnswer(sql("select pos, key, to_json(value) from v, " +
+          "lateral variant_explode(parse_json(json))"), expected)
+        val expectedOuter = if (expected.isEmpty) Seq(Row(null, null, null)) 
else expected
+        checkAnswer(sql("select pos, key, to_json(value) from v, " +
+          "lateral variant_explode_outer(parse_json(json))"), expectedOuter)
+      }
+    }
+
+    Seq("true", "false").foreach { codegenEnabled =>
+      withSQLConf(SQLConf.WHOLESTAGE_CODEGEN_ENABLED.key -> codegenEnabled) {
+        check(null, Nil)
+        check("1", Nil)

Review Comment:
   I can live with an empty result set, given the precedence.



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