[teiid-issues] [JBoss JIRA] Closed: (TEIID-1376) Add support for pushing joins through a union

Add support for pushing joins through a union --------------------------------------------- Key: TEIID-1376 URL: https://issues.jboss.org/browse/TEIID-1376 Project: Teiid Issue Type: Feature Request Components: Query Engine Affects Versions: 7.2 Reporter: Steven Hawkins Assignee: Steven Hawkins Fix For: 7.3 Given a query structure such as: inner join union all a b union all c d where a,b,c,d are access nodes to a source that supports joins and there is a constant column projected by each union branch and that column is used in the join predicates, then we should be able examine union all inner join a c inner join a d ... to determine if any of the joins will no longer be necessary. This is a possible pattern in a multi-source or partitioning scenario. In some scenarios there may not be an actual projected literal, which could be accommodated if a foreign key could be marked as partitioned.