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src/sql/engine/expr/ob_expr_concat.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 _OB_SQL_EXPR_CONCAT_H_
+#define _OB_SQL_EXPR_CONCAT_H_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase {
+namespace sql {
+class ObExprConcat : public ObStringExprOperator {
+  public:
+  explicit ObExprConcat(common::ObIAllocator& alloc);
+  virtual ~ObExprConcat();
+
+  virtual int calc_resultN(
+      common::ObObj& result, const common::ObObj* objs, int64_t param_num, common::ObExprCtx& expr_ctx) const;
+  virtual int calc_result_typeN(
+      ObExprResType& type, ObExprResType* types, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
+  static int calc(common::ObObj& result, const common::ObObj& obj1, const common::ObObj& obj2,
+      common::ObIAllocator* allocator, const common::ObObjType result_type, bool is_oracle_mode);
+  // Check result length with %max_result_len (if %max_result_len greater than zero)
+  // or max length of varchar.
+  // %result type is set to varchar.
+  static int calc(common::ObObj& result, const common::ObString obj1, const common::ObString obj2,
+      common::ObIAllocator* allocator, bool is_oracle_mode = false, const int64_t max_result_len = 0);
+  // Check result length with OB_MAX_PACKET_LENGTH.
+  // %result type is set to ObLongTextType
+  static int calc(common::ObObj& result, const char* obj1_ptr, const int32_t this_len, const char* obj2_ptr,
+      const int32_t other_len, common::ObIAllocator* allocator);
+
+  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+
+  static int eval_concat(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprConcat);
+};
+
+}  // namespace sql
+}  // namespace oceanbase
+#endif /* _OB_SQL_EXPR_CONCAT_H_ */