Index functions and INDEX_CREATE_SKIP_BUILD

In ReindexRelationConcurrently(), the call of index_concurrently_create_copy()
is enclosed in

	/*
	 * Switch to the table owner's userid, so that any index functions are
	 * run as that user.  Also lock down security-restricted operations
	 * and arrange to make GUC variable changes local to this command.
	 */
	GetUserIdAndSecContext(&save_userid, &save_sec_context);
	SetUserIdAndSecContext(heapRel->rd_rel->relowner,
						   save_sec_context | SECURITY_RESTRICTED_OPERATION);
	save_nestlevel = NewGUCNestLevel();

and

	/* Roll back any GUC changes executed by index functions */
	AtEOXact_GUC(false, save_nestlevel);

	/* Restore userid and security context */
	SetUserIdAndSecContext(save_userid, save_sec_context);

Which index functions can be called if index_create() receives the
INDEX_CREATE_SKIP_BUILD flag?

-- 
Antonin Houska
Web: https://www.cybertec-postgresql.com