[SPARK-8288][SQL] ScalaReflection can use companion object constructor

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala

@@ -864,7 +864,11 @@ trait ScalaReflection {
   }
 
   protected def constructParams(tpe: Type): Seq[Symbol] = {
-    val constructorSymbol = tpe.member(termNames.CONSTRUCTOR)
+    val constructorSymbol = tpe.member(termNames.CONSTRUCTOR) match {
+      case NoSymbol =>
+        tpe.typeSymbol.asClass.companion.asTerm.typeSignature.member(universe.TermName("apply"))
+      case sym => sym
+    }
     val params = if (constructorSymbol.isMethod) {
       constructorSymbol.asMethod.paramLists
     } else {

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/ScalaReflectionSuite.scala

@@ -105,6 +105,21 @@ object TestingUDT {
   }
 }
 
+trait ScroogeLikeExample extends Product1[Int] with java.io.Serializable {
+  import ScroogeLikeExample._
+
+  def _1: Int
+
+  def canEqual(other: Any): Boolean = other.isInstanceOf[ScroogeLikeExample]
+}
+
+object ScroogeLikeExample {
+  def apply(x: Int): ScroogeLikeExample = new Immutable(x)
+
+  class Immutable(x: Int) extends ScroogeLikeExample {
+    def _1: Int = x
+  }
+}
 
 class ScalaReflectionSuite extends SparkFunSuite {
   import org.apache.spark.sql.catalyst.ScalaReflection._
@@ -335,4 +350,10 @@ class ScalaReflectionSuite extends SparkFunSuite {
     assert(linkedHashMapDeserializer.dataType == ObjectType(classOf[LHMap[_, _]]))
   }
 
+  test("SPARK-8288") {
+    val schema = schemaFor[ScroogeLikeExample]
+    assert(schema === Schema(
+      StructType(Seq(
+        StructField("x", IntegerType, nullable = false))), nullable = true))
+  }
 }