Rule类 参考

#include <rules.h>

类 Rule 继承关系图:

Public 成员函数
Pattern *	get_match_pattern () const
bool	is_physical () const
bool	is_logical () const
RuleType	get_type ()
uint32_t	get_rule_idx ()
virtual RulePromise	promise (GroupExpr *group_expr) const
virtual void	transform (OperatorNode *input, std::vector< std::unique_ptr< OperatorNode > > *transformed, OptimizerContext *context) const =0

Protected 属性
RuleType	type_
unique_ptr< Pattern >	match_pattern_

详细描述

TODO: Distinguish from logical rules and unify logical rewrite rule

成员函数说明

get_match_pattern()

Pattern * Rule::get_match_pattern ( ) const

inline

Gets the match pattern for the rule

返回

match pattern

get_rule_idx()

uint32_t Rule::get_rule_idx ( )

inline

返回

index of the rule for bitmask

get_type()

RuleType Rule::get_type ( )

inline

返回

the type of the rule

is_logical()

bool Rule::is_logical ( ) const

inline

返回

whether the rule is a logical rule

is_physical()

bool Rule::is_physical ( ) const

inline

返回

whether the rule is a physical transformation

promise()

virtual RulePromise Rule::promise ( GroupExpr *  group_expr ) const

inlinevirtual

Get the promise of the current rule for a expression in the current context.

返回

The promise, the higher the promise, the rule should be applied sooner

transform()

virtual void Rule::transform ( OperatorNode *  input, std::vector< std::unique_ptr< OperatorNode > > *  transformed, OptimizerContext *  context  ) const

pure virtual

Convert a "before" operator tree to an "after" operator tree

参数

input	The "before" operator tree
transformed	Vector of "after" operator trees
context	The current optimization context

在 LogicalGetToPhysicalSeqScan, LogicalProjectionToProjection, LogicalInsertToInsert, LogicalExplainToExplain, LogicalCalcToCalc, LogicalDeleteToDelete , 以及 LogicalPredicateToPredicate 内被实现.

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该类的文档由以下文件生成:

• src/observer/sql/optimizer/cascade/rules.h