PlanExecState.h

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#ifndef EXECUTION_PLANEXECSTATE_H
#define EXECUTION_PLANEXECSTATE_H
 
#include "tdb.h"
 
#include "storage/Record.h"
#include "utils/tree/TreeNode.h"
 
namespace taco {
 
class PlanNode;
 
class PlanExecState: public TreeNode {
public:
    template<class ...UniquePtrs>
    PlanExecState(NodeTag tag, UniquePtrs&& ...input):
        TreeNode(tag, std::forward<UniquePtrs>(input)...),
        m_initialized(false) {}
 
    virtual ~PlanExecState() {}
 
    virtual void init() = 0;
 
    virtual bool next_tuple() = 0;
 
    virtual std::vector<NullableDatumRef> get_record() = 0;
 
    virtual void close() = 0;
 
    virtual Datum
    save_position() const {
        LOG(kFatal, "save_position() not supported by %s",
                    node_tag_name(get_tag()));
        return Datum::FromNull();
    }
 
    virtual void rewind() = 0;
 
    virtual bool
    rewind(DatumRef saved_position) {
        LOG(kFatal, "rewind(saved_position) not supported by %s",
                    node_tag_name(get_tag()));
        return false;
    }
 
    virtual const PlanNode* get_plan() const = 0;
 
protected:
    PlanExecState* get_child(size_t i) const {
        return get_input_as<PlanExecState>(i);
    }
 
    bool m_initialized;
};
 
}    // namespace taco
 
#endif