{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/27704776","id":27704776,"diff_hunk":"@@ -176,6 +176,9 @@ private[sql] object DataSourceStrategy extends Strategy {\n       case expressions.Contains(a: Attribute, Literal(v: String, StringType)) =>\n         Some(sources.StringContains(a.name, v))\n \n+      case p: expressions.Predicate =>","path":"sql/core/src/main/scala/org/apache/spark/sql/sources/DataSourceStrategy.scala","position":4,"original_position":4,"commit_id":"275a4936a9cbce478f3cf62e8cad916df752fb0e","original_commit_id":"275a4936a9cbce478f3cf62e8cad916df752fb0e","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":"I think I agree.  It is reasonable to have predicates that can't be pushed down for various reasons.  Another issue is this check could often be a runtime error instead of some static compile time check.","created_at":"2015-04-02T22:55:44Z","updated_at":"2015-04-02T22:55:44Z","html_url":"https://github.com/apache/spark/pull/5309#discussion_r27704776","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/5309","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/27704776"},"html":{"href":"https://github.com/apache/spark/pull/5309#discussion_r27704776"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/5309"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/5309","id":32409472,"html_url":"https://github.com/apache/spark/pull/5309","diff_url":"https://github.com/apache/spark/pull/5309.diff","patch_url":"https://github.com/apache/spark/pull/5309.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/5309","number":5309,"state":"open","locked":false,"title":"[SPARK-6647][SQL] Make trait StringComparison as BinaryPredicate and throw error when Predicate can't translate to data source Filter","user":{"login":"viirya","id":68855,"avatar_url":"https://avatars.githubusercontent.com/u/68855?v=3","gravatar_id":"","url":"https://api.github.com/users/viirya","html_url":"https://github.com/viirya","followers_url":"https://api.github.com/users/viirya/followers","following_url":"https://api.github.com/users/viirya/following{/other_user}","gists_url":"https://api.github.com/users/viirya/gists{/gist_id}","starred_url":"https://api.github.com/users/viirya/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/viirya/subscriptions","organizations_url":"https://api.github.com/users/viirya/orgs","repos_url":"https://api.github.com/users/viirya/repos","events_url":"https://api.github.com/users/viirya/events{/privacy}","received_events_url":"https://api.github.com/users/viirya/received_events","type":"User","site_admin":false},"body":"Now trait `StringComparison` is a `BinaryExpression`. In fact, it should be a `BinaryPredicate`.\r\n\r\nBy making `StringComparison` as `BinaryPredicate`, we can throw error when a `expressions.Predicate` can't translate to a data source `Filter` in function `selectFilters`.\r\n\r\nWithout this modification, because we will wrap a `Filter` outside the scanned results in `pruneFilterProjectRaw`, we can't detect about something is wrong in translating predicates to filters in `selectFilters`.\r\n\r\nThe unit test of #5285 demonstrates such problem. In that pr, even `expressions.Contains` is not properly translated to `sources.StringContains`, the filtering is still performed by the `Filter` and so the test passes.\r\n\r\nOf course, by doing this modification, all `expressions.Predicate` classes need to have its data source `Filter` correspondingly.\r\n\r\nThere is a small bug in `FilteredScanSuite` for doing `StringEndsWith` filter. This pr also fixes it.","created_at":"2015-04-01T11:17:04Z","updated_at":"2015-04-02T22:55:44Z","closed_at":null,"merged_at":null,"merge_commit_sha":"1a594441c4aa5feeeb9eab7adbf2e85c53dd2402","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/5309/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/5309/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/5309/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/275a4936a9cbce478f3cf62e8cad916df752fb0e","head":{"label":"viirya:translate_predicate","ref":"translate_predicate","sha":"275a4936a9cbce478f3cf62e8cad916df752fb0e","user":{"login":"viirya","id":68855,"avatar_url":"https://avatars.githubusercontent.com/u/68855?v=3","gravatar_id":"","url":"https://api.github.com/users/viirya","html_url":"https://github.com/viirya","followers_url":"https://api.github.com/users/viirya/followers","following_url":"https://api.github.com/users/viirya/following{/other_user}","gists_url":"https://api.github.com/users/viirya/gists{/gist_id}","starred_url":"https://api.github.com/users/viirya/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/viirya/subscriptions","organizations_url":"https://api.github.com/users/viirya/orgs","repos_url":"https://api.github.com/users/viirya/repos","events_url":"https://api.github.com/users/viirya/events{/privacy}","received_events_url":"https://api.github.com/users/viirya/received_events","type":"User","site_admin":false},"repo":{"id":21467907,"name":"spark-1","full_name":"viirya/spark-1","owner":{"login":"viirya","id":68855,"avatar_url":"https://avatars.githubusercontent.com/u/68855?v=3","gravatar_id":"","url":"https://api.github.com/users/viirya","html_url":"https://github.com/viirya","followers_url":"https://api.github.com/users/viirya/followers","following_url":"https://api.github.com/users/viirya/following{/other_user}","gists_url":"https://api.github.com/users/viirya/gists{/gist_id}","starred_url":"https://api.github.com/users/viirya/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/viirya/subscriptions","organizations_url":"https://api.github.com/users/viirya/orgs","repos_url":"https://api.github.com/users/viirya/repos","events_url":"https://api.github.com/users/viirya/events{/privacy}","received_events_url":"https://api.github.com/users/viirya/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/viirya/spark-1","description":"Mirror 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