2d19a9d8f5
Co-authored-by: leslieyuchen <leslieyuchen@gmail.com> Co-authored-by: Charles0429 <xiezhenjiang@gmail.com> Co-authored-by: raywill <hustos@gmail.com>
166 lines
7.7 KiB
C++
166 lines
7.7 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_SIMPLIFY_EXPR_H
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#define OB_TRANSFORM_SIMPLIFY_EXPR_H
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#include "sql/rewrite/ob_transform_rule.h"
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namespace oceanbase {
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namespace sql {
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struct ObNotNullContext;
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class ObTransformSimplifyExpr : public ObTransformRule
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{
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public:
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ObTransformSimplifyExpr(ObTransformerCtx *ctx)
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: ObTransformRule(ctx, TransMethod::POST_ORDER, T_SIMPLIFY_EXPR)
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{}
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virtual ~ObTransformSimplifyExpr() {}
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virtual int transform_one_stmt(common::ObIArray<ObParentDMLStmt> &parent_stmts,
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ObDMLStmt *&stmt,
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bool &trans_happened) override;
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private:
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int replace_is_null_condition(ObDMLStmt *stmt, bool &trans_happened);
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int inner_replace_is_null_condition(ObDMLStmt *stmt,
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ObRawExpr *&expr,
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ObNotNullContext ¬_null_ctx,
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bool &trans_happened);
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int do_replace_is_null_condition(ObDMLStmt *stmt,
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ObRawExpr *&expr,
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ObNotNullContext ¬_null_ctx,
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bool &trans_happened);
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int replace_op_null_condition(ObDMLStmt *stmt, bool &trans_happened);
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int replace_cmp_null_condition(ObRawExpr *&expr,
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const ObDMLStmt &stmt,
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const ParamStore ¶m_store,
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bool &trans_happened);
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int extract_null_expr(ObRawExpr *expr,
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const ObDMLStmt &stmt,
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const ParamStore ¶m_store,
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ObIArray<const ObRawExpr *> &null_expr_lists);
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int convert_preds_vector_to_scalar(ObDMLStmt *stmt, bool &trans_happened);
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int convert_join_preds_vector_to_scalar(TableItem *table_item, bool &trans_happened);
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int inner_convert_preds_vector_to_scalar(ObRawExpr *expr, ObIArray<ObRawExpr*> &exprs, bool &trans_happened);
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int remove_dummy_exprs(ObDMLStmt *stmt, bool &trans_happened);
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int remove_dummy_filter_exprs(common::ObIArray<ObRawExpr*> &exprs,
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ObIArray<ObExprConstraint> &constraints);
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int remove_dummy_join_condition_exprs(TableItem *table,
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ObIArray<ObExprConstraint> &constraints);
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int inner_remove_dummy_expr(ObRawExpr *&expr,
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ObIArray<ObExprConstraint> &constraints);
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int inner_remove_dummy_expr(common::ObIArray<ObRawExpr*> &exprs,
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ObIArray<ObExprConstraint> &constraints);
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int is_valid_transform_type(ObRawExpr *expr,
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bool &is_valid);
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int adjust_dummy_expr(const ObIArray<int64_t> &true_exprs,
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const ObIArray<int64_t> &false_exprs,
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const bool is_and_op,
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ObIArray<ObRawExpr *> &adjust_exprs,
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ObRawExpr *&transed_expr,
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ObIArray<ObExprConstraint> &constraints);
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int remove_dummy_case_when(ObDMLStmt *stmt, bool &trans_happened);
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int remove_dummy_case_when(ObQueryCtx* query_ctx,
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ObRawExpr *expr,
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bool &trans_happened);
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int inner_remove_dummy_case_when(ObQueryCtx* query_ctx,
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ObCaseOpRawExpr *case_expr,
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bool &trans_happened);
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int remove_dummy_nvl(ObDMLStmt *stmt,
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bool &trans_happened);
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int inner_remove_dummy_nvl(ObDMLStmt *stmt,
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ObRawExpr *&expr,
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ObNotNullContext ¬_null_ctx,
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bool &trans_happened);
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int do_remove_dummy_nvl(ObDMLStmt *stmt,
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ObRawExpr *&expr,
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ObNotNullContext ¬_null_ctx,
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bool &trans_happened);
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int convert_nvl_predicate(ObDMLStmt *stmt, bool &trans_happened);
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int inner_convert_nvl_predicate(ObDMLStmt *stmt,
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ObRawExpr *&expr,
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bool &trans_happened);
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int do_convert_nvl_predicate(ObDMLStmt *stmt,
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ObRawExpr *&parent_expr,
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ObRawExpr *&nvl_expr,
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ObRawExpr *&sibling_expr,
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bool nvl_at_left,
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bool &trans_happened);
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int replace_like_condition(ObDMLStmt *stmt,
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bool &trans_happened);
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int check_like_condition(ObRawExpr *&expr,
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ObIArray<ObRawExpr *> &old_exprs,
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ObIArray<ObRawExpr *> &new_exprs,
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ObIArray<ObExprConstraint> &constraints);
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int do_check_like_condition(ObRawExpr *&expr,
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ObIArray<ObRawExpr *> &old_exprs,
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ObIArray<ObRawExpr *> &new_exprs,
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ObIArray<ObExprConstraint> &constraints);
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int remove_subquery_when_filter_is_false(ObDMLStmt* stmt,
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bool& trans_happened);
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int try_remove_subquery_in_expr(ObDMLStmt* stmt,
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ObRawExpr*& expr,
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bool& trans_happened);
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int adjust_subquery_comparison_expr(ObRawExpr *&expr,
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bool is_empty_left,
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bool is_empty_right,
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ObRawExpr* param_expr_left,
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ObRawExpr* param_expr_right);
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int do_remove_subquery(ObDMLStmt* stmt,
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ObRawExpr*& expr,
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bool& trans_happened,
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bool& is_empty);
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int is_valid_for_remove_subquery(const ObSelectStmt* stmt,
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bool& is_valid);
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int is_filter_false(ObSelectStmt* stmt,
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bool& is_where_false,
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bool& is_having_false,
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bool& is_having_true);
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int is_filter_exprs_false(common::ObIArray<ObRawExpr*>& condition_exprs,
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bool& is_false,
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bool& is_true);
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int check_limit_value(ObSelectStmt* stmt,
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bool& is_limit_filter_false,
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ObRawExpr*& limit_cons);
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int replace_expr_when_filter_is_false(ObRawExpr*& expr);
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int build_expr_for_not_empty_set(ObSelectStmt* sub_stmt,
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ObRawExpr*& expr);
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int build_null_for_empty_set(const ObSelectStmt* sub_stmt,
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ObRawExpr*& expr);
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int build_null_expr_and_cast(const ObRawExpr* expr,
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ObRawExpr*& cast_expr);
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int flatten_stmt_exprs(ObDMLStmt *stmt, bool &trans_happened);
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int flatten_join_condition_exprs(TableItem *table, bool &trans_happened);
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int flatten_exprs(common::ObIArray<ObRawExpr*> &exprs, bool &trans_happened);
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int transform_is_false_true_expr(ObDMLStmt *stmt, bool &trans_happened);
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int remove_false_true(common::ObIArray<ObRawExpr*> &exprs, bool &trans_happened);
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int is_valid_remove_false_true(ObRawExpr *expr, bool &is_valid);
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int remove_false_true(ObRawExpr *expr, ObRawExpr *&ret_expr, bool &trans_happened);
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};
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}
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}
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#endif // OB_TRANSFORM_SIMPLIFY_EXPR_H
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