Sergei Golubchik e054d8b874 MDEV-37815 connect_string in partitioning is broken ...

let's simplify the code by removing copying of part_elem->connect_string
to table->s->connect_string. Move CONNECTION support from he server into
engines, engines define TOPTION("CONNECTION") if they want to support it,
it's stored in the option_struct and handled by the option_struct fix.
Problems:

* Mroonga used CONNECTION for something but there were no tests for it.
  Removed Mroonga support for CONNECTION as requested by the maintainer
  in MDEV-38530
* DROP/ALTER SERVER command used to close all tables using the server
  in question, avoiding the need for FLUSH TABLES. This functionality
  never worked for partitioned tables anyway and is now removed. Will be
  done properly in MDEV-37827.

2026-02-06 17:46:52 +01:00

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