Rex Johnston 10c5f48692
MDEV-39492 PQ framework for manager and worker threads ...
Introduces parallel_worker_threads variable to control the number
of worker threads created by a parallel execution query.
2 new files, sql_parallel_workers.h sql_parallel_workers.cc which
contain structures for the creation, management and deletion of
parallel worker threads (pwt_ in the name). Main management
class created in the stack in JOIN::exec, implemented for the
top level select.
Threads are registed in server_threads, so are visible in
information_schema.processlist and the show processlist command.
We check that a kill query on a parallel worker is passed onto it's
manager and the query is properly aborted, and that a kill connection
is handled properly in parallel_worker.test.
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10c5f48692