{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/69498807","id":69498807,"diff_hunk":"@@ -46,6 +46,15 @@ trait CheckAnalysis extends PredicateHelper {\n     }).length > 1\n   }\n \n+  private def checkLimitClause(limitExpr: Expression): Unit = {\n+    val numRows = limitExpr.eval().asInstanceOf[Int]","path":"sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala","position":5,"original_position":5,"commit_id":"3c402d304883fa83712f07cd09a3bbe765b1f071","original_commit_id":"3c402d304883fa83712f07cd09a3bbe765b1f071","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":"ah, but it's still foldable. Is it possible it's non-foldable?","created_at":"2016-07-05T01:31:14Z","updated_at":"2016-07-05T01:31:14Z","html_url":"https://github.com/apache/spark/pull/14034#discussion_r69498807","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/14034","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/69498807"},"html":{"href":"https://github.com/apache/spark/pull/14034#discussion_r69498807"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/14034"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/14034","id":76081800,"html_url":"https://github.com/apache/spark/pull/14034","diff_url":"https://github.com/apache/spark/pull/14034.diff","patch_url":"https://github.com/apache/spark/pull/14034.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/14034","number":14034,"state":"open","locked":false,"title":"[SPARK-16355] [SPARK-16354] [SQL] Fix Bugs When LIMIT/TABLESAMPLE is Zero or Negative","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":"#### What changes were proposed in this pull request?\r\n**Issue 1:** When a query containing LIMIT/TABLESAMPLE 0, the statistics could be zero. Results are correct but it could cause a huge performance regression. For example,\r\n```Scala\r\nSeq((\"one\", 1), (\"two\", 2), (\"three\", 3), (\"four\", 4)).toDF(\"k\", \"v\")\r\n  .createOrReplaceTempView(\"test\")\r\nval df1 = spark.table(\"test\")\r\nval df2 = spark.table(\"test\").limit(0)\r\nval df = df1.join(df2, Seq(\"k\"), \"left\")\r\n```\r\nThe statistics of both `df` and `df2` are zero. The statistics values should never be zero; otherwise `sizeInBytes` of `BinaryNode` will also be zero (product of children). This PR is to increase it to `1` when the num of rows is equal to 0.\r\n\r\n**Issue 2:** When a query containing negative LIMIT/TABLESAMPLE, we should issue exceptions. Negative values could break the implementation assumption of multiple parts. For example, statistics calculation.  Below is the example query.\r\n```SQL\r\nSELECT * FROM testData TABLESAMPLE (-1 rows)\r\nSELECT * FROM testData LIMIT -1\r\n``` \r\nThis PR is to issue an appropriate exception in this case.\r\n\r\n#### How was this patch tested?\r\nAdded test 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