_can_be_null depends on the expression

This commit is contained in:
JUAN DENT
2017-12-18 16:51:47 -06:00
parent 5cb081a721
commit 91e0712e6c

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@@ -63,7 +63,7 @@ namespace sqlpp
using _traits = make_traits<text, tag::is_expression, tag::is_selectable>;
using _nodes = detail::type_vector<Expr, aggregate_function>;
using _can_be_null = std::true_type;
using _can_be_null = can_be_null_t<Expr>;
using _is_aggregate_expression = std::false_type;
using _auto_alias_t = trim_alias_t;