{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/216935736","pull_request_review_id":154530459,"id":216935736,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDIxNjkzNTczNg==","diff_hunk":"@@ -147,4 +147,12 @@ class VectorAssemblerSuite\n       .filter(vectorUDF($\"features\") > 1)\n       .count() == 1)\n   }\n+\n+  test(\"SPARK-25371: VectorAssembler with empty inputCols\") {\n+    val inputDF = Seq(\n+      (1, Vectors.dense(1.0, 2.0)), (2, Vectors.sparse(2, Array(1), Array(3.0)))).toDF(\"i\", \"v\")\n+    val vectorAssembler = new VectorAssembler().setInputCols(Array()).setOutputCol(\"a\")\n+    val output = vectorAssembler.transform(inputDF)\n+    assert(output.select(\"a\").limit(1).collect().head == Row(Vectors.sparse(0, Seq.empty)))\n+  }","path":"mllib/src/test/scala/org/apache/spark/ml/feature/VectorAssemblerSuite.scala","position":11,"original_position":11,"commit_id":"66b6bd5b7e1538d60915b62fa1155dcd86f3411a","original_commit_id":"66b6bd5b7e1538d60915b62fa1155dcd86f3411a","user":{"login":"mgaido91","id":8821783,"node_id":"MDQ6VXNlcjg4MjE3ODM=","avatar_url":"https://avatars1.githubusercontent.com/u/8821783?v=4","gravatar_id":"","url":"https://api.github.com/users/mgaido91","html_url":"https://github.com/mgaido91","followers_url":"https://api.github.com/users/mgaido91/followers","following_url":"https://api.github.com/users/mgaido91/following{/other_user}","gists_url":"https://api.github.com/users/mgaido91/gists{/gist_id}","starred_url":"https://api.github.com/users/mgaido91/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mgaido91/subscriptions","organizations_url":"https://api.github.com/users/mgaido91/orgs","repos_url":"https://api.github.com/users/mgaido91/repos","events_url":"https://api.github.com/users/mgaido91/events{/privacy}","received_events_url":"https://api.github.com/users/mgaido91/received_events","type":"User","site_admin":false},"body":"Sure, will do, thanks","created_at":"2018-09-12T08:14:00Z","updated_at":"2018-09-12T08:14:00Z","html_url":"https://github.com/apache/spark/pull/22391#discussion_r216935736","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/22391","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/216935736"},"html":{"href":"https://github.com/apache/spark/pull/22391#discussion_r216935736"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/22391"}},"in_reply_to_id":216793201},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/22391","id":214546726,"node_id":"MDExOlB1bGxSZXF1ZXN0MjE0NTQ2NzI2","html_url":"https://github.com/apache/spark/pull/22391","diff_url":"https://github.com/apache/spark/pull/22391.diff","patch_url":"https://github.com/apache/spark/pull/22391.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/22391","number":22391,"state":"open","locked":false,"title":"[SPARK-25371][SQL][BACKPORT-2.3] struct() should allow being called with 0 args","user":{"login":"mgaido91","id":8821783,"node_id":"MDQ6VXNlcjg4MjE3ODM=","avatar_url":"https://avatars1.githubusercontent.com/u/8821783?v=4","gravatar_id":"","url":"https://api.github.com/users/mgaido91","html_url":"https://github.com/mgaido91","followers_url":"https://api.github.com/users/mgaido91/followers","following_url":"https://api.github.com/users/mgaido91/following{/other_user}","gists_url":"https://api.github.com/users/mgaido91/gists{/gist_id}","starred_url":"https://api.github.com/users/mgaido91/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mgaido91/subscriptions","organizations_url":"https://api.github.com/users/mgaido91/orgs","repos_url":"https://api.github.com/users/mgaido91/repos","events_url":"https://api.github.com/users/mgaido91/events{/privacy}","received_events_url":"https://api.github.com/users/mgaido91/received_events","type":"User","site_admin":false},"body":"## What changes were proposed in this pull request?\r\n\r\nSPARK-21281 introduced a check for the inputs of `CreateStructLike` to be non-empty. This means that `struct()`, which was previously considered valid, now throws an Exception.  This behavior change was introduced in 2.3.0. The change may break users' application on upgrade and it causes `VectorAssembler` to fail when an empty `inputCols` is defined.\r\n\r\nThe PR removes the added check making `struct()` valid again.\r\n\r\n## How was this patch tested?\r\n\r\nadded UT\r\n","created_at":"2018-09-11T08:09:01Z","updated_at":"2018-09-12T08:14:00Z","closed_at":null,"merged_at":null,"merge_commit_sha":"a8a375c0b66152d5739ae84520db54e2ee8ec555","assignee":null,"assignees":[],"requested_reviewers":[],"requested_teams":[],"labels":[],"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/22391/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/22391/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/22391/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/66b6bd5b7e1538d60915b62fa1155dcd86f3411a","head":{"label":"mgaido91:SPARK-25371_2.3","ref":"SPARK-25371_2.3","sha":"66b6bd5b7e1538d60915b62fa1155dcd86f3411a","user":{"login":"mgaido91","id":8821783,"node_id":"MDQ6VXNlcjg4MjE3ODM=","avatar_url":"https://avatars1.githubusercontent.com/u/8821783?v=4","gravatar_id":"","url":"https://api.github.com/users/mgaido91","html_url":"https://github.com/mgaido91","followers_url":"https://api.github.com/users/mgaido91/followers","following_url":"https://api.github.com/users/mgaido91/following{/other_user}","gists_url":"https://api.github.com/users/mgaido91/gists{/gist_id}","starred_url":"https://api.github.com/users/mgaido91/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mgaido91/subscriptions","organizations_url":"https://api.github.com/users/mgaido91/orgs","repos_url":"https://api.github.com/users/mgaido91/repos","events_url":"https://api.github.com/users/mgaido91/events{/privacy}","received_events_url":"https://api.github.com/users/mgaido91/received_events","type":"User","site_admin":false},"repo":{"id":94518128,"node_id":"MDEwOlJlcG9zaXRvcnk5NDUxODEyOA==","name":"spark","full_name":"mgaido91/spark","owner":{"login":"mgaido91","id":8821783,"node_id":"MDQ6VXNlcjg4MjE3ODM=","avatar_url":"https://avatars1.githubusercontent.com/u/8821783?v=4","gravatar_id":"","url":"https://api.github.com/users/mgaido91","html_url":"https://github.com/mgaido91","followers_url":"https://api.github.com/users/mgaido91/followers","following_url":"https://api.github.com/users/mgaido91/following{/other_user}","gists_url":"https://api.github.com/users/mgaido91/gists{/gist_id}","starred_url":"https://api.github.com/users/mgaido91/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mgaido91/subscriptions","organizations_url":"https://api.github.com/users/mgaido91/orgs","repos_url":"https://api.github.com/users/mgaido91/repos","events_url":"https://api.github.com/users/mgaido91/events{/privacy}","received_events_url":"https://api.github.com/users/mgaido91/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/mgaido91/spark","description":"Mirror 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