Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/20694#discussion_r173584330 --- Diff: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/JsonExpressionsSuite.scala --- @@ -680,4 +682,31 @@ class JsonExpressionsSuite extends SparkFunSuite with ExpressionEvalHelper { ) } } + + test("from_json missing fields") { + for (forceJsonNullableSchema <- Seq(false, true)) { + withSQLConf(SQLConf.FROM_JSON_FORCE_NULLABLE_SCHEMA.key -> forceJsonNullableSchema.toString) { + val input = + """{ + | "a": 1, + | "c": "foo" + |} + |""" + .stripMargin + val jsonSchema = new StructType() + .add("a", LongType, nullable = false) + .add("b", StringType, nullable = false) + .add("c", StringType, nullable = false) + val output = InternalRow(1L, null, UTF8String.fromString("foo")) + checkEvaluation( + JsonToStructs(jsonSchema, Map.empty, Literal.create(input, StringType), gmtId), + output + ) + val schema = JsonToStructs(jsonSchema, Map.empty, Literal.create(input, StringType), gmtId) + .dataType + val schemaToCompare = if (forceJsonNullableSchema) jsonSchema.asNullable else jsonSchema + assert(schemaToCompare == schema); --- End diff -- Nit: `;` is useless.
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