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create Union query to concatenate results from multiple entities #429

Closed mbjones closed 7 years ago

mbjones commented 7 years ago

Author Name: ben leinfelder (ben leinfelder) Original Redmine Issue: 2979, https://projects.ecoinformatics.org/ecoinfo/issues/2979 Original Date: 2007-10-09 Original Assignee: ben leinfelder

The motivation for this enhancement came from both Kepler (wanting to merge data from like-structured datatables in an EMLDataSource actor) and from the FIRST project where a similar function is desired (but across many different packages). Implementation is intended to be a straightforward SQL union/union all between two or more Query objects.

mbjones commented 7 years ago

Original Redmine Comment Author Name: ben leinfelder (ben leinfelder) Original Date: 2007-10-09T22:27:29Z

created org.ecoinformatics.datamanager.database.Union created org.ecoinformatics.datamanager.database.UnionTest (test source tree) modified org.ecoinformatics.datamanager.DataManager to execute Union queries (just like existing normal Query)

mbjones commented 7 years ago

Original Redmine Comment Author Name: ben leinfelder (ben leinfelder) Original Date: 2010-01-11T19:09:03Z

this has long been resolved and is in use extensively in the FIRST project

mbjones commented 7 years ago

Original Redmine Comment Author Name: Redmine Admin (Redmine Admin) Original Date: 2013-03-27T21:21:54Z

Original Bugzilla ID was 2979