some sql classes refactorings like column and table structs to classes

source/orm/orm/schema.cpp

@@ -52,6 +52,9 @@ matador::utils::result<void, matador::utils::error> matador::orm::schema::create
 
     std::vector<std::string> fk_sql_commands;
     auto c = pool_.acquire();
+
+    // auto result = query::query::create().schema( repo_.name() ).compile( *c );
+    // std::cout << result.sql << std::endl;
     for (const auto &node: repo_) {
         auto ctx = query::query::create()
           .table(node->name(), node->info().definition().columns())

source/orm/orm/session.cpp

@@ -90,13 +90,13 @@ utils::result<sql::query_result<sql::record>, utils::error> session::fetch_all(c
   if (!c.valid()) {
     return utils::failure(make_error(error_code::NoConnectionAvailable, "Failed to acquire connection."));
   }
-  auto it = prototypes_.find(q.table.name);
+  auto it = prototypes_.find(q.table.name());
   if (it == prototypes_.end()) {
-    auto result = c->describe(q.table.name);
+    auto result = c->describe(q.table.name());
     if (!result) {
       return utils::failure(result.err());
     }
-    it = prototypes_.emplace(q.table.name, *result).first;
+    it = prototypes_.emplace(q.table.name(), *result).first;
   }
   // adjust columns from given query
   for (auto &col: q.prototype) {

source/orm/orm/session_query_builder.cpp

@@ -39,12 +39,12 @@ void criteria_transformer::visit( const query::not_criteria& node ) {
 }
 
 void criteria_transformer::update_criteria_column(const query::abstract_column_criteria& node) const {
-    const auto it = tables_by_name_.find(node.column().table()->name);
+    const auto it = tables_by_name_.find(node.column().table()->name());
     if (it == tables_by_name_.end()) {
         return;
     }
 
-    const_cast<sql::column&>(node.column()).table_ = it->second;
+    const_cast<sql::column&>(node.column()).table(it->second);
 }
 
 void session_query_builder::on_revision(const char *id, uint64_t &/*rev*/) {
@@ -73,7 +73,7 @@ std::string session_query_builder::build_alias(const char prefix, const unsigned
 void session_query_builder::append_join(const sql::column &left, const sql::column &right) {
   using namespace matador::query;
   entity_query_data_.joins.push_back({
-    {right.table_},
+    {right.table()},
     std::make_unique<binary_column_criteria>(left, binary_operator::EQUALS, right)
   });
 }