/**
 * Copyright (c) 2021 OceanBase
 * OceanBase CE is licensed under Mulan PubL v2.
 * You can use this software according to the terms and conditions of the Mulan PubL v2.
 * You may obtain a copy of Mulan PubL v2 at:
 *          http://license.coscl.org.cn/MulanPubL-2.0
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PubL v2 for more details.
 */

#ifndef OCEANBASE_BASIC_OB_FUNCTION_TABLE_OP_H_
#define OCEANBASE_BASIC_OB_FUNCTION_TABLE_OP_H_

#include "sql/engine/ob_operator.h"
#include "sql/engine/basic/ob_chunk_datum_store.h"
#include "lib/charset/ob_charset.h"

namespace oceanbase
{
namespace sql
{

class ObExpr;
class ObFunctionTableSpec : public ObOpSpec
{
OB_UNIS_VERSION_V(1);
public:
  ObFunctionTableSpec(common::ObIAllocator &alloc, const ObPhyOperatorType type)
    : ObOpSpec(alloc, type), value_expr_(nullptr), column_exprs_(alloc), has_correlated_expr_(false)
  {}
  ObExpr *value_expr_;
  common::ObFixedArray<ObExpr*, common::ObIAllocator> column_exprs_;
  bool has_correlated_expr_;
};

class ObFunctionTableOp : public ObOperator
{
public:
  ObFunctionTableOp(ObExecContext &exec_ctx, const ObOpSpec &spec, ObOpInput *input)
    : ObOperator(exec_ctx, spec, input),
    node_idx_(0),
    already_calc_(false),
    row_count_(0),
    col_count_(0),
    value_table_(NULL) 
  {}

  virtual int inner_open() override;
  virtual int inner_rescan() override;
  virtual int switch_iterator() override;
  virtual int inner_get_next_row() override;
  //virtual int inner_get_next_batch(int64_t max_row_cnt) override;
  virtual int inner_close() override;
  virtual void destroy() override;
private:
  int inner_get_next_row_udf();
  int inner_get_next_row_sys_func();
  int get_current_result(common::ObObj &result);
  int64_t node_idx_;
  bool already_calc_;
  int64_t row_count_;
  int64_t col_count_;
  common::ObObj value_;
  pl::ObPLCollection *value_table_;
  int (ObFunctionTableOp::*next_row_func_)();
};

} // end namespace sql
} // end namespace oceanbase

#endif /* OCEANBASE_BASIC_OB_FUNCTION_TABLE_OP_H_ */