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Hooks for function calls

此版本暂无所选语言的定义，以下显示原始英文内容。

Interface type

needs_fmgr_hook_type

Header

src/include/fmgr.h

Subsystem

Logging and function calls

Initial value

NULL (no hook installed)

signature

typedef bool (*needs_fmgr_hook_type) (Oid fn_oid); extern PGDLLIMPORT needs_fmgr_hook_type needs_fmgr_hook;