[FEAT MERGE] 4.3 optimizer enhancement

Co-authored-by: 2149 <260391947@qq.com>
Co-authored-by: akaError <lzg020616@163.com>
Co-authored-by: jinmaoli <lijinmao.csmaster@gmail.com>

src/sql/resolver/expr/ob_raw_expr_canonicalizer.h

@@ -1,47 +0,0 @@
-/**
- * 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_RAW_EXPR_CANONICALIZER_H
-#define _OB_RAW_EXPR_CANONICALIZER_H 1
-#include "sql/resolver/expr/ob_raw_expr.h"
-namespace oceanbase
-{
-namespace sql
-{
-// 表达式规范化
-class ObRawExprCanonicalizer
-{
-public:
-  ObRawExprCanonicalizer() {}
-  virtual ~ObRawExprCanonicalizer() {}
-  /**
-   * Canonicalize the expression.
-   *
-   * @param expr [in/out]
-   *
-   * @return error code
-   */
-  virtual int canonicalize(ObRawExpr *&expr) = 0;
-private:
-  // types and constants
-private:
-  // disallow copy
-  DISALLOW_COPY_AND_ASSIGN(ObRawExprCanonicalizer);
-  // function members
-private:
-  // data members
-};
-
-} // end namespace sql
-} // end namespace oceanbase
-
-#endif /* _OB_RAW_EXPR_CANONICALIZER_H */