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Plus some assorted fixes for move semantics stuff in BufferView that
accompanied these changes.
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The existing reconstruction logic will occasionally attempt to append an
empty level to another empty level, for some reason. While the underlying
cause of this needs to be looked into, this special case should prevent
shard constructors being called with a shard count of 0 under tiering,
reducing the error handling overhead of shard code.
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In InternalLevel::clone(), the m_shard_cnt variable was not being set
appropriately in the clone, resulting in the record counts reported for
a multi-shard level to be reported incorrectly.
In DynamicExtension::merge(), the merges were being performed in the
wrong order, resulting in multi-level merges deleting records. The
leveling tests all passed even with this bug for some reason, but it
caused tiering tests to fail. It isn't clear _why_ leveling appeared to
work, but the bug is now fixed, so that's largely irrelevant I suppose.
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This is a big one--probably should have split it apart, but I'm feeling
lazy this morning.
* Organized the mess of header files in include/framework by splitting
them out into their own subdirectories, and renaming a few files to
remove redundancies introduced by the directory structure.
* Introduced a new framework/ShardRequirements.h header file for simpler
shard development. This header simply contains the necessary includes
from framework/* for creating shard files. This should help to remove
structural dependencies from the framework file structure and shards,
as well as centralizing the necessary framework files to make shard
development easier.
* Created a (currently dummy) SchedulerInterface, and make the scheduler
implementation a template parameter of the dynamic extension for easier
testing of various scheduling policies. There's still more work to be
done to fully integrate the scheduler (queries, multiple buffers), but
some more of the necessary framework code for this has been added as well.
* Adjusted the Task interface setup for the scheduler. The task structures
have been removed from ExtensionStructure and placed in their own header
file. Additionally, I started experimenting with using std::variant,
as opposed to inheritence, to implement subtype polymorphism on the
Merge and Query tasks. The scheduler now has a general task queue that
contains both, and std::variant, std::visit, and std::get are used to
manipulate them without virtual functions.
* Removed Alex.h, as it can't build anyway. There's a branch out there
containing the Alex implementation stripped of the C++20 stuff. So
there's no need to keep it here.
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