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