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Hook for plugins to get control during joinrel setup

此版本暂无所选语言的定义，以下显示原始英文内容。

Interface type

joinrel_setup_hook_type

Header

src/include/optimizer/pathnode.h

Subsystem

Query planning

Initial value

NULL (no hook installed)

signature

typedef void (*joinrel_setup_hook_type) (PlannerInfo *root, RelOptInfo *joinrel, RelOptInfo *outer_rel, RelOptInfo *inner_rel, SpecialJoinInfo *sjinfo, List *restrictlist); extern PGDLLIMPORT joinrel_setup_hook_type joinrel_setup_hook;