{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/49292062","id":49292062,"diff_hunk":"@@ -49,4 +50,16 @@ class CatalystQlSuite extends PlanTest {\n     parser.createPlan(\"select sum(product + 1) over (partition by (product + (1)) order by 2) \" +\n       \"from windowData\")\n   }\n+\n+  test(\"limit clause: a support in set operation\") {\n+    val plan1 = parser.createPlan(\"select key from (select * from t1) x limit 1\")\n+    assert(plan1.collect{ case w: Limit => w }.size === 1)\n+\n+    val plan2 = parser.createPlan(\"select key from (select * from t1 limit 2) x limit 1\")\n+    assert(plan2.collect{ case w: Limit => w }.size === 2)\n+\n+    val plan3 = parser.createPlan(\"select key from ((select * from testData limit 1) \" +\n+      \"union all (select * from testData limit 1)) x limit 1\")\n+    assert(plan3.collect{ case w: Limit => w }.size === 3)","path":"sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/CatalystQlSuite.scala","position":22,"original_position":22,"commit_id":"6244975948c016f5adc7dedef825d472f01c8846","original_commit_id":"6244975948c016f5adc7dedef825d472f01c8846","user":{"login":"rxin","id":323388,"avatar_url":"https://avatars.githubusercontent.com/u/323388?v=3","gravatar_id":"","url":"https://api.github.com/users/rxin","html_url":"https://github.com/rxin","followers_url":"https://api.github.com/users/rxin/followers","following_url":"https://api.github.com/users/rxin/following{/other_user}","gists_url":"https://api.github.com/users/rxin/gists{/gist_id}","starred_url":"https://api.github.com/users/rxin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rxin/subscriptions","organizations_url":"https://api.github.com/users/rxin/orgs","repos_url":"https://api.github.com/users/rxin/repos","events_url":"https://api.github.com/users/rxin/events{/privacy}","received_events_url":"https://api.github.com/users/rxin/received_events","type":"User","site_admin":false},"body":"can we do this similar to how we compare plans in various optimizer suites, e.g. https://github.com/apache/spark/blob/master/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/OptimizeInSuite.scala#L84","created_at":"2016-01-11T06:13:18Z","updated_at":"2016-01-11T06:13:18Z","html_url":"https://github.com/apache/spark/pull/10689#discussion_r49292062","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/10689","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/49292062"},"html":{"href":"https://github.com/apache/spark/pull/10689#discussion_r49292062"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/10689"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/10689","id":55580375,"html_url":"https://github.com/apache/spark/pull/10689","diff_url":"https://github.com/apache/spark/pull/10689.diff","patch_url":"https://github.com/apache/spark/pull/10689.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/10689","number":10689,"state":"open","locked":false,"title":"[SPARK-12745] [SQL] Hive Parser: Limit is not supported inside Set Operation","user":{"login":"gatorsmile","id":11567269,"avatar_url":"https://avatars.githubusercontent.com/u/11567269?v=3","gravatar_id":"","url":"https://api.github.com/users/gatorsmile","html_url":"https://github.com/gatorsmile","followers_url":"https://api.github.com/users/gatorsmile/followers","following_url":"https://api.github.com/users/gatorsmile/following{/other_user}","gists_url":"https://api.github.com/users/gatorsmile/gists{/gist_id}","starred_url":"https://api.github.com/users/gatorsmile/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gatorsmile/subscriptions","organizations_url":"https://api.github.com/users/gatorsmile/orgs","repos_url":"https://api.github.com/users/gatorsmile/repos","events_url":"https://api.github.com/users/gatorsmile/events{/privacy}","received_events_url":"https://api.github.com/users/gatorsmile/received_events","type":"User","site_admin":false},"body":"The current SQLContext allows the following query, which is copied from a test case in SQLQuerySuite:\r\n```\r\n     checkAnswer(sql(\r\n       \"\"\"\r\n         |select key from ((select * from testData limit 1)\r\n         |  union all (select * from testData limit 1)) x limit 1\r\n       \"\"\".stripMargin),\r\n       Row(1)\r\n     )\r\n```\r\nHowever, it is rejected by the Hive parser. \r\n\r\nThis PR is to make Hive parser support the Limit Clause inside Set Operator. 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