Hi Serg!

Thanks for review

On Tue, Aug 20, 2019 at 6:08 PM Sergei Golubchik <s...@mariadb.org> wrote:

> Hi, Sachin!
>
> On Aug 20, Sachin Setiya wrote:
> > revision-id: 4ca016237f1 (mariadb-10.4.5-152-g4ca016237f1)
> > parent(s): 4a5cd407289
> > author: Sachin <sachin.set...@mariadb.com>
> > committer: Sachin <sachin.set...@mariadb.com>
> > timestamp: 2019-07-29 19:33:05 +0530
> > message:
> >
> > MDEV-20001 Potential dangerous regression: INSERT INTO >=100 rows fail
> for myisam table with HASH indexes
> >
> > Dont deactivate the long unique keys on bulk insert.
> >
> > diff --git a/storage/myisam/ha_myisam.cc b/storage/myisam/ha_myisam.cc
> > index f478e01e441..c1169737911 100644
> > --- a/storage/myisam/ha_myisam.cc
> > +++ b/storage/myisam/ha_myisam.cc
> > @@ -1749,7 +1749,16 @@ void ha_myisam::start_bulk_insert(ha_rows rows,
> uint flags)
> >      else
> >      {
> >        my_bool all_keys= MY_TEST(flags & HA_CREATE_UNIQUE_INDEX_BY_SORT);
> > -      mi_disable_indexes_for_rebuild(file, rows, all_keys);
> > +      if (table->s->long_unique_table)
> > +      {
> > +        ulonglong hash_key_map= 0ULL;
> > +        for(uint i= 0; i < table->s->keys; i++)
> > +          if (table->key_info[i].algorithm == HA_KEY_ALG_LONG_HASH)
> > +            mi_set_key_active(hash_key_map, i);
> > +        mi_disable_indexes_for_rebuild(file, rows, all_keys,
> hash_key_map);
> > +      }
> > +      else
> > +        mi_disable_indexes_for_rebuild(file, rows, all_keys, 0ULL);
>
> I agree with the fix, but here's a comment about the implementation.
> mi_disable_indexes_for_rebuild() is _only_ used here, nowhere else.
> So, I think I'd just removed mi_disable_indexes_for_rebuild(), inlined
> it here and do everything in one loop.
>
Done.

>
> Note, that you also need to fix Aria engine, it has almost the same
> code. And add a test for it, please.
>
> Actually long unique index does not work in Aria (Mdev-18791), So I have
not changed anything in
Aria engine.
Commit link
http://lists.askmonty.org/pipermail/commits/2019-October/014023.html

> >      }
> >    }
>
> Regards,
> Sergei
> VP of MariaDB Server Engineering
> and secur...@mariadb.org
>


-- 
Regards
Sachin Setiya
Software Engineer at  MariaDB
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