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2 commits

Author SHA1 Message Date
Yorick Peterse
9eefae6917 Fix UNION syntax for MySQL
Apparently MySQL doesn't support this syntax:

    (...) UNION (...)

instead it only supports:

    ...
    UNION
    ...
2015-11-18 13:31:18 +01:00
Yorick Peterse
d769596aec Added Gitlab::SQL::Union class
This class can be used to join multiple AcitveRecord::Relation objects
together using a SQL UNION statement. ActiveRecord < 5.0 sadly doesn't
support UNION and existing Gems out there don't handle prepared
statements (e.g. they never incremented the variable bindings).
2015-11-18 13:02:43 +01:00