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src/sql/engine/expr/ob_expr_field.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_OB_EXPR_FIELD_
+#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_FIELD_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+#include "share/object/ob_obj_cast.h"
+
+namespace oceanbase {
+namespace sql {
+class ObExprField : public ObVectorExprOperator {
+  public:
+  explicit ObExprField(common::ObIAllocator& alloc);
+  virtual ~ObExprField(){};
+  virtual int assign(const ObExprOperator& other);
+
+  public:
+  // serialize and deserialize
+  virtual int serialize(char* buf, const int64_t buf_len, int64_t& pos) const;
+  virtual int deserialize(const char* buf, const int64_t data_len, int64_t& pos);
+  virtual int64_t get_serialize_size() const;
+
+  public:
+  virtual int calc_result_typeN(
+      ObExprResType& type, ObExprResType* type_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
+
+  virtual int calc_resultN(
+      common::ObObj& result, const common::ObObj* obj_stack, int64_t param_num, common::ObExprCtx& expr_ctx) const;
+
+  OB_INLINE int calc_without_cast(
+      common::ObObj& result, const common::ObObj* obj_stack, int64_t param_num, common::ObExprCtx& expr_ctx) const;
+  OB_INLINE int calc_with_cast(
+      common::ObObj& result, const common::ObObj* obj_stack, int64_t param_num, common::ObExprCtx& expr_ctx) const;
+  void set_need_cast(bool need_cast)
+  {
+    need_cast_ = need_cast;
+  }
+
+  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+  static int eval_field(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+
+  private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprField);
+
+  private:
+  bool need_cast_;
+};
+
+}  // namespace sql
+}  // namespace oceanbase
+#endif  // OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_FIELD_