collection resolver progress

include/matador/sql/internal/object_resolver_producer.hpp

@@ -0,0 +1,24 @@
+#ifndef MATADOR_RESOLVER_PRODUCER_HPP
+#define MATADOR_RESOLVER_PRODUCER_HPP
+
+#include "matador/object/object_resolver.hpp"
+
+#include <memory>
+
+namespace matador::sql {
+class executor;
+class object_resolver_producer {
+public:
+  virtual ~object_resolver_producer() = default;
+  virtual std::shared_ptr<object::abstract_type_resolver> produce(executor &exec) = 0;
+
+  [[nodiscard]] const std::type_index& type() const;
+
+protected:
+  explicit object_resolver_producer(const std::type_index &type);
+
+private:
+  std::type_index type_;
+};
+}
+#endif //MATADOR_RESOLVER_PRODUCER_HPP