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src/sql/engine/expr/ob_expr_to_blob.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_OB_EXPR_TO_BLOB_H_
+#define _OCEANBASE_SQL_OB_EXPR_TO_BLOB_H_
+#include "sql/engine/expr/ob_expr_operator.h"
+#include "share/object/ob_obj_cast.h"
+
+namespace oceanbase {
+namespace sql {
+
+// https://docs.oracle.com/cd/B28359_01/server.111/b28286/functions186.htm#SQLRF30029
+class ObExprToBlob : public ObStringExprOperator {
+  public:
+  explicit ObExprToBlob(common::ObIAllocator& alloc);
+  virtual ~ObExprToBlob();
+  virtual int calc_result_type1(ObExprResType& type, ObExprResType& text, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_result1(common::ObObj& result, const common::ObObj& text, common::ObExprCtx& expr_ctx) const;
+  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
+  static int eval_to_blob(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res);
+
+  private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprToBlob);
+};
+
+}  // namespace sql
+}  // namespace oceanbase
+
+#endif  // OB_EXPR_TO_BLOB_H_