engines moved to separate library

lib/engines/mssql/columns.sql

@@ -0,0 +1,13 @@
+select c.name as columnName, t.name as dataType, c.object_id as objectId, c.is_identity as isIdentity,
+	c.max_length as maxLength, c.precision, c.scale, c.is_nullable as isNullable,
+	d.definition as defaultValue, d.name as defaultConstraint,
+	m.definition as computedExpression, m.is_persisted as isPersisted, c.column_id as columnId, 
+	-- TODO only if version >= 2008
+	c.is_sparse as isSparse
+from sys.columns c
+inner join sys.types t on c.system_type_id = t.system_type_id and c.user_type_id = t.user_type_id
+inner join sys.objects o on c.object_id = o.object_id
+left join sys.default_constraints d on c.default_object_id = d.object_id
+left join sys.computed_columns m on m.object_id = c.object_id and m.column_id = c.column_id
+where o.type = 'U' and o.object_id =[OBJECT_ID_CONDITION]
+order by c.column_id