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src/sql/resolver/expr/ob_raw_expr_canonicalizer_impl.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_RAW_EXPR_CANONICALIZER_IMPL_H
+#define _OB_RAW_EXPR_CANONICALIZER_IMPL_H
+#include "sql/resolver/expr/ob_raw_expr_canonicalizer.h"
+namespace oceanbase {
+namespace sql {
+class ObRawExprCanonicalizerImpl : public ObRawExprCanonicalizer {
+  public:
+  explicit ObRawExprCanonicalizerImpl(ObExprResolveContext& ctx);
+  virtual ~ObRawExprCanonicalizerImpl()
+  {}
+
+  virtual int canonicalize(ObRawExpr*& expr);
+
+  private:
+  // types and constants
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObRawExprCanonicalizerImpl);
+  // function members
+  typedef int (ObRawExprCanonicalizerImpl::*process_action)(ObRawExpr*& expr);
+  int process_children(ObRawExpr*& expr, process_action trave_action);
+  int push_not(ObRawExpr*& expr);
+  int do_push_not(ObRawExpr*& expr);
+  int pull_parallel_expr(ObRawExpr*& expr);
+  int pull_and_factor(ObRawExpr*& expr);
+  int pull_similar_expr(ObRawExpr*& expr);
+  int cluster_and_or(ObRawExpr*& expr);
+
+  private:
+  struct ObOppositeOpPair {
+    ObItemType original_;
+    ObItemType opposite_;
+  };
+  static ObItemType get_opposite_op(ObItemType type);
+  static ObOppositeOpPair OPPOSITE_PAIRS[];
+
+  private:
+  // data members
+  ObExprResolveContext& ctx_;
+  //  ObIAllocator &allocator_;
+};
+
+}  // end namespace sql
+}  // end namespace oceanbase
+
+#endif /* _OB_RAW_EXPR_CANONICALIZER_IMPL_H */