{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/205928966","pull_request_review_id":141303546,"id":205928966,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDIwNTkyODk2Ng==","diff_hunk":"@@ -3968,3 +3964,317 @@ object ArrayUnion {\n     new GenericArrayData(arrayBuffer)\n   }\n }\n+\n+/**\n+ * Returns an array of the elements in the intersect of x and y, without duplicates\n+ */\n+@ExpressionDescription(\n+  usage = \"\"\"\n+  _FUNC_(array1, array2) - Returns an array of the elements in array1 but not in array2,\n+    without duplicates.\n+  \"\"\",\n+  examples = \"\"\"\n+    Examples:\n+      > SELECT _FUNC_(array(1, 2, 3), array(1, 3, 5));\n+       array(2)\n+  \"\"\",\n+  since = \"2.4.0\")\n+case class ArrayExcept(left: Expression, right: Expression) extends ArraySetLike\n+    with ComplexTypeMergingExpression {\n+  override def dataType: DataType = {\n+    dataTypeCheck","path":"sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala","position":48,"original_position":48,"commit_id":"6ef1f22aa68d52cf0c00b21211e19d3f80bab7c6","original_commit_id":"4a70e0e1d7ba4bf63d73a025eee262842f9bcaf9","user":{"login":"cloud-fan","id":3182036,"node_id":"MDQ6VXNlcjMxODIwMzY=","avatar_url":"https://avatars3.githubusercontent.com/u/3182036?v=4","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":"My motivation is to let these array functions to go through the type coercion rules for `ComplexTypeMergingExpression`. This check is like `assert` and I don't need we need it if we override `dataType`","created_at":"2018-07-28T01:40:31Z","updated_at":"2018-07-28T01:40:31Z","html_url":"https://github.com/apache/spark/pull/21103#discussion_r205928966","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/21103","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/205928966"},"html":{"href":"https://github.com/apache/spark/pull/21103#discussion_r205928966"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/21103"}},"in_reply_to_id":205848094},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/21103","id":182559352,"node_id":"MDExOlB1bGxSZXF1ZXN0MTgyNTU5MzUy","html_url":"https://github.com/apache/spark/pull/21103","diff_url":"https://github.com/apache/spark/pull/21103.diff","patch_url":"https://github.com/apache/spark/pull/21103.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/21103","number":21103,"state":"open","locked":false,"title":"[SPARK-23915][SQL] Add array_except function","user":{"login":"kiszk","id":1315079,"node_id":"MDQ6VXNlcjEzMTUwNzk=","avatar_url":"https://avatars2.githubusercontent.com/u/1315079?v=4","gravatar_id":"","url":"https://api.github.com/users/kiszk","html_url":"https://github.com/kiszk","followers_url":"https://api.github.com/users/kiszk/followers","following_url":"https://api.github.com/users/kiszk/following{/other_user}","gists_url":"https://api.github.com/users/kiszk/gists{/gist_id}","starred_url":"https://api.github.com/users/kiszk/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kiszk/subscriptions","organizations_url":"https://api.github.com/users/kiszk/orgs","repos_url":"https://api.github.com/users/kiszk/repos","events_url":"https://api.github.com/users/kiszk/events{/privacy}","received_events_url":"https://api.github.com/users/kiszk/received_events","type":"User","site_admin":false},"body":"## What changes were proposed in this pull request?\r\n\r\nThe PR adds the SQL function `array_except`. The behavior of the function is based on Presto's one.\r\n\r\nThis function returns returns an array of the elements in array1 but not in array2.\r\n\r\nNote: The order of elements in the result is not defined.\r\n\r\n## How was this patch tested?\r\n\r\nAdded UTs.\r\n","created_at":"2018-04-18T18:06:43Z","updated_at":"2018-07-28T01:40:31Z","closed_at":null,"merged_at":null,"merge_commit_sha":"692ca92532ac1bd36ababc6e3f469fdb76694c1c","assignee":null,"assignees":[],"requested_reviewers":[],"requested_teams":[],"labels":[],"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/21103/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/21103/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/21103/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/6ef1f22aa68d52cf0c00b21211e19d3f80bab7c6","head":{"label":"kiszk:SPARK-23915","ref":"SPARK-23915","sha":"6ef1f22aa68d52cf0c00b21211e19d3f80bab7c6","user":{"login":"kiszk","id":1315079,"node_id":"MDQ6VXNlcjEzMTUwNzk=","avatar_url":"https://avatars2.githubusercontent.com/u/1315079?v=4","gravatar_id":"","url":"https://api.github.com/users/kiszk","html_url":"https://github.com/kiszk","followers_url":"https://api.github.com/users/kiszk/followers","following_url":"https://api.github.com/users/kiszk/following{/other_user}","gists_url":"https://api.github.com/users/kiszk/gists{/gist_id}","starred_url":"https://api.github.com/users/kiszk/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kiszk/subscriptions","organizations_url":"https://api.github.com/users/kiszk/orgs","repos_url":"https://api.github.com/users/kiszk/repos","events_url":"https://api.github.com/users/kiszk/events{/privacy}","received_events_url":"https://api.github.com/users/kiszk/received_events","type":"User","site_admin":false},"repo":{"id":45008789,"node_id":"MDEwOlJlcG9zaXRvcnk0NTAwODc4OQ==","name":"spark","full_name":"kiszk/spark","owner":{"login":"kiszk","id":1315079,"node_id":"MDQ6VXNlcjEzMTUwNzk=","avatar_url":"https://avatars2.githubusercontent.com/u/1315079?v=4","gravatar_id":"","url":"https://api.github.com/users/kiszk","html_url":"https://github.com/kiszk","followers_url":"https://api.github.com/users/kiszk/followers","following_url":"https://api.github.com/users/kiszk/following{/other_user}","gists_url":"https://api.github.com/users/kiszk/gists{/gist_id}","starred_url":"https://api.github.com/users/kiszk/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kiszk/subscriptions","organizations_url":"https://api.github.com/users/kiszk/orgs","repos_url":"https://api.github.com/users/kiszk/repos","events_url":"https://api.github.com/users/kiszk/events{/privacy}","received_events_url":"https://api.github.com/users/kiszk/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/kiszk/spark","description":"Mirror 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