get_attavgwidth_hook

Description

Hook for plugins to get control in get_attavgwidth()

Interface type

get_attavgwidth_hook_type

Header

src/include/utils/lsyscache.h

Subsystem

Statistics and estimation

Initial value

NULL (no hook installed)

C interface

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

Call sites

src/backend/utils/cache/lsyscache.c:3467

Core call context: src/backend/utils/cache/lsyscache.c:3461–3475

{
	HeapTuple	tp;
	int32		stawidth;

	if (get_attavgwidth_hook)
	{
		stawidth = (*get_attavgwidth_hook) (relid, attnum);
		if (stawidth > 0)
			return stawidth;
	}
	tp = SearchSysCache3(STATRELATTINH,
						 ObjectIdGetDatum(relid),
						 Int16GetDatum(attnum),
						 BoolGetDatum(false));
	if (HeapTupleIsValid(tp))

Related entries

• The Planner/Optimizer

Documentation and source

• Interface declaration
• Core definition
• Call sites

Related entries

• get_index_stats_hookget_index_stats_hook
• get_relation_stats_hookget_relation_stats_hook