[MySQL][Spider][VP]Spider-2.5 Vartical Partitioning-0.5 released

I'm pleased to announce the release of Spider storage engine version 2.5(beta) and Vertical Partitioning storage engine version 0.5(alpha).
Spider is a Storage Engine for database sharding.
Vertical Partitioning is a Storage Engine for vertical partitioning for a table.

The main changes in this version are following.
- The standalone compilation with Vertical Partitioning storage engine is now available.

- Vertical Partitioning can be used for multi-step partitioning.
    create table a(a int primary key)engine=myisam;
    create table b(a int primary key)engine=vp comment 'tnl "a"';
    create table c(a int primary key)engine=vp comment 'tnl "b"';

- Add table parameter "bgs_mode", "bgi_mode" and "bgu_mode".
- Add server parameter "vp_bgs_mode", "vp_bgi_mode" and "vp_bgu_mode".
  Parallel search and update from Vertical Partitioning to Spider are now available by using this parameters.

Please see "99_change_logs.txt" in the download documents for checking other changes.


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