GitHub user cloud-fan opened a pull request: https://github.com/apache/spark/pull/18559
[SPARK-21335][SQL] support un-aliased subquery ## What changes were proposed in this pull request? un-aliased subquery is supported by Spark SQL for a long time. Its semantic was not well defined and had confusing behaviors, and it's not a standard SQL syntax, so we disallowed it in https://issues.apache.org/jira/browse/SPARK-20690 . However, this is a breaking change, and we do have existing queries using un-aliased subquery. We should add the support back and fix its semantic. This PR fixes the un-aliased subquery by assigning a default alias name. ## How was this patch tested? new regression test You can merge this pull request into a Git repository by running: $ git pull https://github.com/cloud-fan/spark sub-query Alternatively you can review and apply these changes as the patch at: https://github.com/apache/spark/pull/18559.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #18559 ---- commit 4d99c11802efa2d6ee5c36de5941226bf12e1a55 Author: Wenchen Fan <wenc...@databricks.com> Date: 2017-07-07T04:03:34Z support un-aliased subquery ---- --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org