Fix test

dialects/mssql.go

@@ -589,7 +589,7 @@ IXS.is_unique AS [IS_UNIQUE]
 FROM sys.indexes IXS
 INNER JOIN sys.index_columns IXCS
 ON IXS.OBJECT_ID=IXCS.OBJECT_ID  AND IXS.INDEX_ID = IXCS.INDEX_ID
-INNER   JOIN SYS.COLUMNS C  ON IXS.OBJECT_ID=C.OBJECT_ID
+INNER   JOIN sys.columns C  ON IXS.OBJECT_ID=C.OBJECT_ID
 AND IXCS.COLUMN_ID=C.COLUMN_ID
 WHERE IXS.TYPE_DESC='NONCLUSTERED' and OBJECT_NAME(IXS.OBJECT_ID) =?
 `