{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/29078991","id":29078991,"diff_hunk":"@@ -45,6 +48,45 @@ import org.apache.spark.util.Utils\n import org.apache.spark.{Partition, SparkContext}\n \n /**\n+ * Currently we support the default dialect named \"sql\", associated with the class\n+ * [[DefaultDialect]]\n+ *\n+ * And we can also provide custom SQL Dialect, for example in Spark SQL CLI:\n+ * {{{\n+ *-- switch to \"hiveql\" dialect\n+ *   spark-sql>SET spark.sql.dialect=hiveql;\n+ *   spark-sql>SELECT * FROM src LIMIT 1;\n+ *\n+ *-- switch to \"sql\" dialect\n+ *   spark-sql>SET spark.sql.dialect=sql;\n+ *   spark-sql>SELECT * FROM src LIMIT 1;\n+ *\n+ *-- register the new SQL dialect\n+ *   spark-sql> SET spark.sql.dialect=com.xxx.xxx.SQL99Dialect;\n+ *   spark-sql> SELECT * FROM src LIMIT 1;\n+ *\n+ *-- register the non-exist SQL dialect\n+ *   spark-sql> SET spark.sql.dialect=NotExistedClass;\n+ *   spark-sql> SELECT * FROM src LIMIT 1;\n+ *\n+ *-- Exception will be thrown and switch to dialect\n+ *-- \"sql\" (for SQLContext) or \n+ *-- \"hiveql\" (for HiveContext)\n+ * }}}\n+ */\n+private[spark] class DefaultDialect extends Dialect {\n+  @transient\n+  protected val sqlParser = {\n+    val fallback = new catalyst.SqlParser","path":"sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala","position":53,"original_position":53,"commit_id":"81a731f9f9a4eb828deb8d5bcc344bd28221a763","original_commit_id":"81a731f9f9a4eb828deb8d5bcc344bd28221a763","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":"`fallback` is an odd name.","created_at":"2015-04-24T19:38:11Z","updated_at":"2015-04-24T19:38:11Z","html_url":"https://github.com/apache/spark/pull/4015#discussion_r29078991","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/4015","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/29078991"},"html":{"href":"https://github.com/apache/spark/pull/4015#discussion_r29078991"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/4015"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/4015","id":27254683,"html_url":"https://github.com/apache/spark/pull/4015","diff_url":"https://github.com/apache/spark/pull/4015.diff","patch_url":"https://github.com/apache/spark/pull/4015.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/4015","number":4015,"state":"open","locked":false,"title":"[SPARK-5213] [SQL] Pluggable SQL Parser Support","user":{"login":"chenghao-intel","id":2367031,"avatar_url":"https://avatars.githubusercontent.com/u/2367031?v=3","gravatar_id":"","url":"https://api.github.com/users/chenghao-intel","html_url":"https://github.com/chenghao-intel","followers_url":"https://api.github.com/users/chenghao-intel/followers","following_url":"https://api.github.com/users/chenghao-intel/following{/other_user}","gists_url":"https://api.github.com/users/chenghao-intel/gists{/gist_id}","starred_url":"https://api.github.com/users/chenghao-intel/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/chenghao-intel/subscriptions","organizations_url":"https://api.github.com/users/chenghao-intel/orgs","repos_url":"https://api.github.com/users/chenghao-intel/repos","events_url":"https://api.github.com/users/chenghao-intel/events{/privacy}","received_events_url":"https://api.github.com/users/chenghao-intel/received_events","type":"User","site_admin":false},"body":"This PR aims to make the SQL Parser Pluggable, and user can register it's own parser via Spark SQL CLI.\r\n\r\n```\r\n# add the jar into the classpath\r\n$hcheng@mydesktop:spark>bin/spark-sql --jars sql99.jar\r\n\r\n-- switch to \"hiveql\" dialect\r\n   spark-sql>SET spark.sql.dialect=hiveql;\r\n   spark-sql>SELECT * FROM src LIMIT 1;\r\n\r\n-- switch to \"sql\" dialect\r\n   spark-sql>SET spark.sql.dialect=sql;\r\n   spark-sql>SELECT * FROM src LIMIT 1;\r\n\r\n-- switch to a custom dialect\r\n   spark-sql>SET spark.sql.dialect=com.xxx.xxx.SQL99Dialect;\r\n   spark-sql>SELECT * FROM src LIMIT 1;\r\n\r\n-- register the non-exist SQL dialect\r\n   spark-sql> SET spark.sql.dialect=NotExistedClass;\r\n   spark-sql> SELECT * FROM src LIMIT 1;\r\n-- Exception will be thrown and switch to default sql dialect (\"sql\" for SQLContext and \"hiveql\" for HiveContext)\r\n```\r\n\r\n","created_at":"2015-01-13T08:29:09Z","updated_at":"2015-04-24T19:38:11Z","closed_at":null,"merged_at":null,"merge_commit_sha":"c7b72ce75d6a7c217a03f55567550eccfb00128f","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/4015/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/4015/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/4015/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/81a731f9f9a4eb828deb8d5bcc344bd28221a763","head":{"label":"chenghao-intel:sqlparser","ref":"sqlparser","sha":"81a731f9f9a4eb828deb8d5bcc344bd28221a763","user":{"login":"chenghao-intel","id":2367031,"avatar_url":"https://avatars.githubusercontent.com/u/2367031?v=3","gravatar_id":"","url":"https://api.github.com/users/chenghao-intel","html_url":"https://github.com/chenghao-intel","followers_url":"https://api.github.com/users/chenghao-intel/followers","following_url":"https://api.github.com/users/chenghao-intel/following{/other_user}","gists_url":"https://api.github.com/users/chenghao-intel/gists{/gist_id}","starred_url":"https://api.github.com/users/chenghao-intel/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/chenghao-intel/subscriptions","organizations_url":"https://api.github.com/users/chenghao-intel/orgs","repos_url":"https://api.github.com/users/chenghao-intel/repos","events_url":"https://api.github.com/users/chenghao-intel/events{/privacy}","received_events_url":"https://api.github.com/users/chenghao-intel/received_events","type":"User","site_admin":false},"repo":{"id":18098468,"name":"spark","full_name":"chenghao-intel/spark","owner":{"login":"chenghao-intel","id":2367031,"avatar_url":"https://avatars.githubusercontent.com/u/2367031?v=3","gravatar_id":"","url":"https://api.github.com/users/chenghao-intel","html_url":"https://github.com/chenghao-intel","followers_url":"https://api.github.com/users/chenghao-intel/followers","following_url":"https://api.github.com/users/chenghao-intel/following{/other_user}","gists_url":"https://api.github.com/users/chenghao-intel/gists{/gist_id}","starred_url":"https://api.github.com/users/chenghao-intel/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/chenghao-intel/subscriptions","organizations_url":"https://api.github.com/users/chenghao-intel/orgs","repos_url":"https://api.github.com/users/chenghao-intel/repos","events_url":"https://api.github.com/users/chenghao-intel/events{/privacy}","received_events_url":"https://api.github.com/users/chenghao-intel/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/chenghao-intel/spark","description":"Mirror 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