Re: Add Index-level REINDEX with multiple jobs

Alexander Korotkov <aekorotkov@gmail.com> writes:
> Here goes the revised patch.  I'm going to push this if there are no objections.

Quite a lot of the buildfarm is complaining about this:

reindexdb.c: In function 'reindex_one_database':
reindexdb.c:434:54: error: 'indices_tables_cell' may be used uninitialized in this function
[-Werror=maybe-uninitialized]
  434 |     strcmp(prev_index_table_name, indices_tables_cell->val) == 0)
      |                                   ~~~~~~~~~~~~~~~~~~~^~~~~

I noticed it first on mamba, which is set up with -Werror, but a
scrape of the buildfarm logs shows many other animals reporting this
as a warning.  I think they are right.  Even granting that the
compiler realizes that "parallel && process_type == REINDEX_INDEX" is
enough to reach the one place where indices_tables_cell is
initialized, that's not really enough, because that place is

                if (indices_tables_list)
                    indices_tables_cell = indices_tables_list->head;

So I believe this code will crash if get_parallel_object_list returns
an empty list.  Initializing indices_tables_cell to NULL in its
declaration would stop the compiler warning, but if I'm right it
will do nothing to prevent that crash.  This needs a bit more effort.

            regards, tom lane