{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/45398455","id":45398455,"diff_hunk":"@@ -44,20 +44,21 @@ import org.apache.spark.sql.types.{NullType, StructField, ObjectType, StructType\n  *    to the name `value`.\n  */\n object ExpressionEncoder {\n-  def apply[T : TypeTag](flat: Boolean = false): ExpressionEncoder[T] = {\n+  def apply[T : TypeTag](): ExpressionEncoder[T] = {\n     // We convert the not-serializable TypeTag into StructType and ClassTag.\n     val mirror = typeTag[T].mirror\n     val cls = mirror.runtimeClass(typeTag[T].tpe)\n+    val flat = !classOf[Product].isAssignableFrom(cls)","path":"sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/ExpressionEncoder.scala","position":22,"original_position":22,"commit_id":"d0a294ed8254af1623e9ee2e90291e6790e2df67","original_commit_id":"d0a294ed8254af1623e9ee2e90291e6790e2df67","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":"This isn't going to work for java.  We should just leave this as it was.","created_at":"2015-11-19T20:52:25Z","updated_at":"2015-11-19T20:52:25Z","html_url":"https://github.com/apache/spark/pull/9726#discussion_r45398455","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/9726","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/45398455"},"html":{"href":"https://github.com/apache/spark/pull/9726#discussion_r45398455"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/9726"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/9726","id":50772414,"html_url":"https://github.com/apache/spark/pull/9726","diff_url":"https://github.com/apache/spark/pull/9726.diff","patch_url":"https://github.com/apache/spark/pull/9726.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/9726","number":9726,"state":"open","locked":false,"title":"[SPARK-11750][SQL] revert SPARK-11727 and code clean up","user":{"login":"cloud-fan","id":3182036,"avatar_url":"https://avatars.githubusercontent.com/u/3182036?v=3","gravatar_id":"","url":"https://api.github.com/users/cloud-fan","html_url":"https://github.com/cloud-fan","followers_url":"https://api.github.com/users/cloud-fan/followers","following_url":"https://api.github.com/users/cloud-fan/following{/other_user}","gists_url":"https://api.github.com/users/cloud-fan/gists{/gist_id}","starred_url":"https://api.github.com/users/cloud-fan/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cloud-fan/subscriptions","organizations_url":"https://api.github.com/users/cloud-fan/orgs","repos_url":"https://api.github.com/users/cloud-fan/repos","events_url":"https://api.github.com/users/cloud-fan/events{/privacy}","received_events_url":"https://api.github.com/users/cloud-fan/received_events","type":"User","site_admin":false},"body":"After some experiment, I found it's not convenient to have separate encoder builders: `FlatEncoder` and `ProductEncoder`. For example, when create encoders for `ScalaUDF`, we have no idea if the type `T` is flat or not. So I revert the splitting change in https://github.com/apache/spark/pull/9693, while still keeping the bug fixes and 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