58 lines
2.1 KiB
C++
58 lines
2.1 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#ifndef OB_TRANSFORM_POST_PROCESS_H_
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#define OB_TRANSFORM_POST_PROCESS_H_
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#include "sql/rewrite/ob_transform_rule.h"
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#include "sql/resolver/dml/ob_select_stmt.h"
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namespace oceanbase {
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namespace sql {
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class ObTransformPostProcess : public ObTransformRule {
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public:
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ObTransformPostProcess(ObTransformerCtx* ctx) : ObTransformRule(ctx, TransMethod::POST_ORDER)
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{}
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virtual ~ObTransformPostProcess()
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{}
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virtual int transform_one_stmt(
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common::ObIArray<ObParentDMLStmt>& parent_stmts, ObDMLStmt*& stmt, bool& trans_happened) override;
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private:
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int extract_calculable_expr(ObDMLStmt*& stmt, bool& trans_happened);
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int transform_for_hierarchical_query(ObDMLStmt* stmt, bool& trans_happened);
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int pullup_hierarchical_query(ObDMLStmt* stmt, bool& trans_happened);
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int transform_prior_exprs(ObSelectStmt& stmt, TableItem& left_table, TableItem& right_table);
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int get_prior_exprs(ObIArray<ObRawExpr*>& expr, ObIArray<ObRawExpr*>& prior_exprs);
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int get_prior_exprs(ObRawExpr* expr, ObIArray<ObRawExpr*>& prior_exprs);
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int modify_prior_exprs(ObSelectStmt& stmt, TableItem& left_table, TableItem& right_table,
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ObIArray<ObRawExpr*>& prior_exprs, ObIArray<ObRawExpr*>& convert_exprs);
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int make_connect_by_joined_table(ObSelectStmt& stmt, TableItem& left_table, TableItem& right_table);
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int merge_mock_view(ObDMLStmt* stmt, TableItem& table);
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int check_select_item(ObSelectStmt& stmt, bool& has_dup_expr, bool& is_all_column_expr);
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DISALLOW_COPY_AND_ASSIGN(ObTransformPostProcess);
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};
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} // namespace sql
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} // namespace oceanbase
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#endif /* OB_TRANSFORM_POST_PROCESS_H_ */
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