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2021-05-31 22:56:52 +08:00
commit cea7de1475
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--- a/src/sql/engine/expr/ob_expr_arg_case.h
+++ b/src/sql/engine/expr/ob_expr_arg_case.h
@ -0,0 +1,66 @@
+/**
+ * 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_OB_SQL_EXPR_ARG_CASE_H_
+#define OCEANBASE_OB_SQL_EXPR_ARG_CASE_H_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+#include "sql/engine/expr/ob_expr_result_type_util.h"
+
+namespace oceanbase {
+namespace sql {
+
+typedef int (*ob_get_cmp_type_func)(common::ObObjType& type, const common::ObObjType& type1,
+    const common::ObObjType& type2, const common::ObObjType& type3);
+
+class ObExprArgCase : public ObExprOperator {
+  public:
+  explicit ObExprArgCase(common::ObIAllocator& alloc);
+  virtual ~ObExprArgCase();
+
+  virtual int assign(const ObExprOperator& other);
+
+  virtual int deserialize(const char* buf, const int64_t data_len, int64_t& pos);
+
+  virtual int calc_result_typeN(
+      ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_resultN(
+      common::ObObj& result, const common::ObObj* objs_stack, int64_t param_num, common::ObExprCtx& expr_ctx) const;
+  static int calc_with_cast(common::ObObj& result, const common::ObObj* objs_stack, int64_t param_num,
+      common::ObCompareCtx& cmp_ctx, common::ObCastCtx& cast_ctx, const ObExprResType& res_type,
+      const ob_get_cmp_type_func get_cmp_type_func);
+  static int calc_without_cast(common::ObObj& result, const common::ObObj* objs_stack, int64_t param_num,
+      common::ObCastCtx& cast_ctx, common::ObCompareCtx& cmp_ctx, const ObExprResType& res_type);
+  void set_need_cast(bool need_cast)
+  {
+    need_cast_ = need_cast;
+  }
+
+  inline static int get_cmp_type(common::ObObjType& type, const common::ObObjType& type1,
+      const common::ObObjType& type2, const common::ObObjType& type3)
+  {
+    UNUSED(type3);
+    return ObExprResultTypeUtil::get_relational_cmp_type(type, type1, type2);
+  }
+
+  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
+
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprArgCase);
+
+  private:
+  bool need_cast_;
+};
+}  // namespace sql
+}  // namespace oceanbase
+#endif  // OCEANBASE_OB_SQL_EXPR_ARG_CASE_H_