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Added new option to horizontal sharding API
:class:`_horizontal.set_shard_id` which sets the effective shard identifier
to query against, for both the primary query as well as for all secondary
loaders including relationship eager loaders as well as relationship and
column lazy loaders.
Modernize sharding examples with new-style mappings, add new asyncio example.
Fixes: #7226
Fixes: #7028
Change-Id: Ie69248060c305e8de04f75a529949777944ad511
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Allow do_orm_execute() events to both receive the complete
state of bind_argments, load_options, update_delete_options
as they do already, but also allow them to *change* all those
things via new execution options. Options like autoflush,
populate_existing etc. can now be updated within a
do_orm_execute() hook and those changes will take effect
all the way through.
Took a few tries to get something that covers every case here,
in particular horizontal sharding which is consuming those
options as well as using context.invoke(), without excess
complexity. The good news seems to be that a simple
reorg and replacing the "reentrant" boolean with
"is this before do_orm_execute is invoked" was all that was
needed.
As part of this we add a new "identity_token" option allowing
this option to be controlled from do_orm_execute() as well
as from the outside.
WIP
Fixes: #7837
Change-Id: I087728215edec8d1b1712322ab389e3f52ff76ba
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* requirements needs typing_extensions
* update all "future=True" references to be appropriate to 2.0
Change-Id: I2eeb0ae65afdb587f21aeb0020f1d8a292f67c21
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the horizontal sharding API needs some work as it is
still exposing some legacy details, but in any case illustrate
how we can, for the moment, to use multiple schema translate
maps in a single session.
A lot more cleanup is needed in horizontal sharding, see #7837
Change-Id: Ia925e2226ecee9d747a8c4fc1772917f10bc505f
References: #7832
References: #7837
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