Working on #68.
Merge branch 'master' into bug-group-join-any-68
Working on #68.
Merge branch 'master' into bug-group-join-any-68
More BulkCopy options.
Implemented #120. Close #120.
Test for #121.
One more test for #121.
Merge branch 'master' into bug-group-join-any-68
Working on #68.
Switch default test configuration to SQLite.
Fixed nullable field join.
Fixed nullable field association.
Optimized nullable comparison.
Merge branch 'master' into bug-group-join-any-68
Fixed unit test.
Merge branch 'master' into bug-assosiation-union