{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/43820849","id":43820849,"diff_hunk":"@@ -37,3 +35,39 @@ trait Encoder[T] extends Serializable {\n   /** A ClassTag that can be used to construct and Array to contain a collection of `T`. */\n   def clsTag: ClassTag[T]\n }\n+\n+object Encoder {\n+  import scala.reflect.runtime.universe._\n+\n+  def forBoolean: Encoder[java.lang.Boolean] = ExpressionEncoder(flat = true)\n+  def forByte: Encoder[java.lang.Byte] = ExpressionEncoder(flat = true)\n+  def forShort: Encoder[java.lang.Short] = ExpressionEncoder(flat = true)\n+  def forInt: Encoder[java.lang.Integer] = ExpressionEncoder(flat = true)\n+  def forLong: Encoder[java.lang.Long] = ExpressionEncoder(flat = true)\n+  def forFloat: Encoder[java.lang.Float] = ExpressionEncoder(flat = true)\n+  def forDouble: Encoder[java.lang.Double] = ExpressionEncoder(flat = true)\n+  def forString: Encoder[java.lang.String] = ExpressionEncoder(flat = true)\n+\n+  def typeTagOfTuple2[T1 : TypeTag, T2 : TypeTag]: TypeTag[(T1, T2)] = typeTag[(T1, T2)]\n+\n+  private def getTypeTag[T](c: Class[T]): TypeTag[T] = {\n+    import scala.reflect.api\n+\n+    // val mirror = runtimeMirror(c.getClassLoader)\n+    val mirror = rootMirror\n+    val sym = mirror.staticClass(c.getName)\n+    val tpe = sym.selfType\n+    TypeTag(mirror, new api.TypeCreator {\n+      def apply[U <: api.Universe with Singleton](m: api.Mirror[U]) =\n+        if (m eq mirror) tpe.asInstanceOf[U # Type]\n+        else throw new IllegalArgumentException(\n+          s\"Type tag defined in $mirror cannot be migrated to other mirrors.\")\n+    })\n+  }\n+\n+  def forTuple2[T1, T2](c1: Class[T1], c2: Class[T2]): Encoder[(T1, T2)] = {","path":"sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/Encoder.scala","position":43,"original_position":43,"commit_id":"0eea82ce19c8676580ca5279ecfe70e81063b373","original_commit_id":"0eea82ce19c8676580ca5279ecfe70e81063b373","user":{"login":"marmbrus","id":527,"avatar_url":"https://avatars.githubusercontent.com/u/527?v=3","gravatar_id":"","url":"https://api.github.com/users/marmbrus","html_url":"https://github.com/marmbrus","followers_url":"https://api.github.com/users/marmbrus/followers","following_url":"https://api.github.com/users/marmbrus/following{/other_user}","gists_url":"https://api.github.com/users/marmbrus/gists{/gist_id}","starred_url":"https://api.github.com/users/marmbrus/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/marmbrus/subscriptions","organizations_url":"https://api.github.com/users/marmbrus/orgs","repos_url":"https://api.github.com/users/marmbrus/repos","events_url":"https://api.github.com/users/marmbrus/events{/privacy}","received_events_url":"https://api.github.com/users/marmbrus/received_events","type":"User","site_admin":false},"body":"How about just `forTuple`, the type of tuple returned is obvious from the number of arguments.  We should also add at least up to tuple 5.","created_at":"2015-11-03T23:07:36Z","updated_at":"2015-11-03T23:07:36Z","html_url":"https://github.com/apache/spark/pull/9358#discussion_r43820849","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/9358","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/43820849"},"html":{"href":"https://github.com/apache/spark/pull/9358#discussion_r43820849"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/9358"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/9358","id":49153576,"html_url":"https://github.com/apache/spark/pull/9358","diff_url":"https://github.com/apache/spark/pull/9358.diff","patch_url":"https://github.com/apache/spark/pull/9358.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/9358","number":9358,"state":"open","locked":false,"title":"[SPARK-11269][SQL] Java API support & test 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