added test for table sequence

source/orm/query/query_utils.cpp

@@ -15,6 +15,7 @@ void prepare_column(sql::query_context& ctx, const sql::dialect& d, const table_
         attribute_string_writer writer(d, {});
         expression_evaluator v(d, ctx);
         col.expression()->accept(v);
+      ctx.sql += v.result();
 
         if (col.has_alias()) {
             ctx.sql.append(" ").append(d.as()).append(" ").append(col.alias());

source/orm/query/table_column.cpp

@@ -5,6 +5,8 @@
 #include <stdexcept>
 #include <utility>
 
+#include "matador/query/expression/column_expression.hpp"
+
 namespace matador::query {
 
 table_column operator ""_col(const char *name, const size_t len) {
@@ -67,6 +69,10 @@ table_column::table_column(const class table* tab,
 table_column::table_column(const std::shared_ptr<abstract_column_expression>& expression) noexcept
 : table_column(nullptr, "", "", utils::basic_type::Unknown, {}, sql::sql_function_t::None, expression) {}
 
+table_column::table_column(column_expression&& expression) noexcept
+: table_column(std::shared_ptr(expression.release())) {
+}
+
 table_column & table_column::operator=(const table_column &other) {
   if (this == &other) {
     return *this;
@@ -95,7 +101,7 @@ bool table_column::equals(const table_column &x) const {
 }
 
 table_column table_column::as(const std::string& alias) const {
-  return {table_, column_name_, alias, type_, attributes_, function_};
+  return {table_, column_name_, alias, type_, attributes_, function_, expression_};
 }
 
 const std::string& table_column::name() const {