support json type

src/sql/engine/expr/ob_expr_json_replace.h

@@ -0,0 +1,51 @@
+/**
+ * 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.
+ */
+
+// This file contains implementation for json_replace.
+#ifndef OCEANBASE_SQL_OB_EXPR_JSON_REPLACE_H_
+#define OCEANBASE_SQL_OB_EXPR_JSON_REPLACE_H_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+using namespace oceanbase::common;
+
+namespace oceanbase
+{
+namespace sql
+{
+class ObExprJsonReplace : public ObFuncExprOperator
+{
+public:
+  explicit ObExprJsonReplace(common::ObIAllocator &alloc);
+  virtual ~ObExprJsonReplace();
+  virtual int calc_result_typeN(ObExprResType& type,
+                              ObExprResType* types,
+                              int64_t param_num,
+                              common::ObExprTypeCtx& type_ctx)
+                              const override;
+  virtual int calc_resultN(common::ObObj &result,
+                           const common::ObObj *params,
+                           int64_t param_num,
+                           common::ObExprCtx &expr_ctx) const;
+  static int eval_json_replace(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res);
+  virtual int cg_expr(ObExprCGCtx &expr_cg_ctx,
+                      const ObRawExpr &raw_expr,
+                      ObExpr &rt_expr) const override;
+
+virtual bool need_rt_ctx() const override { return true; }
+  private:
+    DISALLOW_COPY_AND_ASSIGN(ObExprJsonReplace);
+};
+
+} // sql
+} // oceanbase
+#endif // OCEANBASE_SQL_OB_EXPR_JSON_REPLACE_H_