zabetak opened a new pull request, #5998: URL: https://github.com/apache/hive/pull/5998
### What changes were proposed in this pull request? 1. Collect all table aliases under joins 2. Introduce derived table whenever the same alias appears more than once ### Why are the changes needed? Some queries that contain joins of the same table more than twice fail during compilation while trying to transform the optimized AST (obtained from CBO) to an Operator tree. The "Ambiguous table alias" exception is raised when a HiveJoin contains the same table scan multiple times (without an interleaving project) cause the generated AST is ambiguous. ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? ``` mvn test -Dtest=TestMiniLlapLocalCliDriver -Dqfile_regex=cbo_self_join.* ``` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: gitbox-unsubscr...@hive.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: gitbox-unsubscr...@hive.apache.org For additional commands, e-mail: gitbox-h...@hive.apache.org
