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Hook for plugins to get control after PlannerGlobal is initialized

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_setup_hook_type

Header

src/include/optimizer/planner.h

Subsystem

Query planning

Initial value

NULL (no hook installed)

signature

typedef void (*planner_setup_hook_type) (PlannerGlobal *glob, Query *parse, const char *query_string, int cursorOptions, double *tuple_fraction, ExplainState *es); extern PGDLLIMPORT planner_setup_hook_type planner_setup_hook;