Wiki / 扩展钩子

Hook for plugins to get control in get_attavgwidth()

此版本暂无所选语言的定义，以下显示原始英文内容。

Interface type

get_attavgwidth_hook_type

Header

src/include/utils/lsyscache.h

Subsystem

Statistics and estimation

Initial value

NULL (no hook installed)

signature

typedef int32 (*get_attavgwidth_hook_type) (Oid relid, AttrNumber attnum); extern PGDLLIMPORT get_attavgwidth_hook_type get_attavgwidth_hook;