greenplumn walkers 源码
greenplumn walkers 代码
文件路径：/src/include/optimizer/walkers.h
/*
* walkers.h
*
* Created on: Feb 8, 2011
* Author: siva
*/
#ifndef WALKERS_H_
#define WALKERS_H_
#include "nodes/nodes.h"
#include "nodes/parsenodes.h"
#include "nodes/pathnodes.h"
#include "nodes/nodeFuncs.h"
/* The plan associated with a SubPlan is found in a list. During planning this is in
* the global structure found through the root PlannerInfo. After planning this is in
* the PlannedStmt.
*
* Structure plan_tree_base_prefix carries the appropriate pointer for GPDB's general plan
* tree walker/mutator framework. All users of the framework must prefix their context
* structure with a plan_tree_base_prefix and initialize it appropriately.
*/
typedef struct plan_tree_base_prefix
{
Node *node; /* PlannerInfo* or PlannedStmt* */
} plan_tree_base_prefix;
extern void planner_init_plan_tree_base(plan_tree_base_prefix *base, PlannerInfo *root);
extern void exec_init_plan_tree_base(plan_tree_base_prefix *base, PlannedStmt *stmt);
extern Plan *plan_tree_base_subplan_get_plan(plan_tree_base_prefix *base, SubPlan *subplan);
extern void plan_tree_base_subplan_put_plan(plan_tree_base_prefix *base, SubPlan *subplan, Plan *plan);
extern bool walk_plan_node_fields(Plan *plan, bool (*walker) (), void *context);
extern bool plan_tree_walker(Node *node, bool (*walker) (), void *context, bool recurse_into_subplans);
/**
* Useful functions that aggregate information from expressions or plans.
*/
extern List *extract_nodes(PlannerGlobal *glob, Node *node, int nodeTag);
extern List *extract_nodes_plan(Plan *pl, int nodeTag, bool descendIntoSubqueries);
extern List *extract_nodes_expression(Node *node, int nodeTag, bool descendIntoSubqueries);
extern int find_nodes(Node *node, List *nodeTags);
extern int check_collation(Node *node);
#endif /* WALKERS_H_ */
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