Allow passing empty arrays as parameters
allow removing column comment on some platforms
fix ModifyLimitQueryTest to correctly assert deterministic and non-deterministic results
fix assertion method for non-deterministic query results
[DBAL-467] Mention VarDateTime in SQL Server limitations.
Merge remote-tracking branch 'origin/pr/264' into DBAL-435
[DBAL-435] Add functional test to verify empty parameters behavior.
Merge branch 'DBAL-435'
Merge pull request #295 from deeky666/fix-modify-limit-query-functional-test

Fix ModifyLimitQueryTest
Merge pull request #294 from deeky666/fix-removing-column-comment

Allow removing column comment on some platforms