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Hook for EXPLAIN plugins to print extra fields on individual plan nodes

此版本暂无所选语言的定义，以下显示原始英文内容。

Interface type

explain_per_node_hook_type

Header

src/include/commands/explain.h

Subsystem

EXPLAIN

Initial value

NULL (no hook installed)

signature

typedef void (*explain_per_node_hook_type) (PlanState *planstate, List *ancestors, const char *relationship, const char *plan_name, struct ExplainState *es); extern PGDLLIMPORT explain_per_node_hook_type explain_per_node_hook;