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Hook for plugins to get control in planner()

此版本暂无所选语言的定义，以下显示原始英文内容。

Interface type

planner_hook_type

Header

src/include/optimizer/planner.h

Subsystem

Query planning

Initial value

NULL (no hook installed)

signature

typedef PlannedStmt *(*planner_hook_type) (Query *parse, const char *query_string, int cursorOptions, ParamListInfo boundParams); extern PGDLLIMPORT planner_hook_type planner_hook;