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