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src/sql/engine/expr/ob_expr_rownum.h

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+/**
+ * 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_SQL_ENGINE_EXPR_ROWNUM_H_
+#define OCEANBASE_SQL_ENGINE_EXPR_ROWNUM_H_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+#include "sql/engine/expr/ob_expr.h"
+
+namespace oceanbase {
+namespace sql {
+class ObExprCGCtx;
+class ObExprRowNum : public ObFuncExprOperator {
+  OB_UNIS_VERSION(1);
+
+  public:
+  explicit ObExprRowNum(common::ObIAllocator& alloc);
+  virtual ~ObExprRowNum();
+  virtual int calc_result_type0(ObExprResType& type, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_result0(common::ObObj& result, common::ObExprCtx& expr_ctx) const;
+
+  // CG && evaluating function for static typing engine
+  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+  static int rownum_eval(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+  void set_op_id(uint64_t operator_id)
+  {
+    operator_id_ = operator_id;
+  }
+
+  private:
+  uint64_t operator_id_;
+  DISALLOW_COPY_AND_ASSIGN(ObExprRowNum);
+};
+
+} /* namespace sql */
+} /* namespace oceanbase */
+
+#endif /* OCEANBASE_SQL_ENGINE_EXPR_ROWNUM_H_ */