Github user viirya commented on a diff in the pull request:
    --- Diff: 
    @@ -590,4 +590,24 @@ class JsonExpressionsSuite extends SparkFunSuite with 
ExpressionEvalHelper {
    +  test("SPARK-21513: to_json support map[string, struct] to json") {
    +    val schema = MapType(StringType, StructType(StructField("a", 
IntegerType) :: Nil))
    +    val input = Literal.create(ArrayBasedMapData(Map("test" -> 
InternalRow(1))), schema)
    +    checkEvaluation(
    +      StructsToJson(Map.empty, input, gmtId),
    --- End diff --
    I think we don't need `gmtId` here.

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