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that primary key collections remain
ordered the same as in the mapped table
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to the minimal set for every test case I can come up with, and
now replaces all the cruft in Mapper._compile_pks() as well as
Join.__init_primary_key(). mappers can now handle aliased selects
and figure out the correct PKs pretty well [ticket:933]
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to allow
joins onto select_table mappers
- starting a generalized reduce_columns func
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branch
- slowly moving Query towards a central "aliasing" paradigm which merges
the aliasing of polymorphic mappers to aliasing against arbitrary select_from(),
to the eventual goal of polymorphic mappers which can also eagerload other
relations
- supports many more join() scenarios involving polymorphic mappers in
most configurations
- PropertyAliasedClauses doesn't need "path", EagerLoader doesn't need to
guess about "towrap"
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functions (more like eventual decorator syntax); remove some old methods, factor out some "raiseerr" ugliness to outer lying functions.
- corresponding_column() integrates "require_embedded" flag with other set arithmetic
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in this case when mapped against a select statement [ticket:904]
- _hide_froms logic in expression totally localized to Join class, including search through previous clone sources
- removed "stop_on" from main visitors, not used
- "stop_on" in AbstractClauseProcessor part of constructor, ClauseAdapter sets it up based on given clause
- fixes to is_derived_from() to take previous clone sources into account, Alias takes self + cloned sources into account. this is ultimately what the #904 bug was.
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- topological.py cleaned up, presents three public facing functions which
return list/tuple based structures, without exposing any internals. only
the third function returns the "hierarchical" structure. when results
include "cycles" or "child" items, 2- or 3- tuples are used to represent
results.
- unitofwork uses InstanceState almost exclusively now. new and deleted lists
are now dicts which ref the actual object to provide a strong ref for the
duration that they're in those lists. IdentitySet is only used for the public
facing versions of "new" and "deleted".
- unitofwork topological sort no longer uses the "hierarchical" version of the sort
for the base sort, only for the "per-object" secondary sort where it still
helps to group non-dependent operations together and provides expected insert
order. the default sort deals with UOWTasks in a straight list and is greatly
simplified. Tests all pass but need to see if svilen's stuff still works,
one block of code in _sort_cyclical_dependencies() seems to not be needed anywhere
but i definitely put it there for a reason at some point; if not hopefully we
can derive more test coverage from that.
- the UOWEventHandler is only applied to object-storing attributes, not
scalar (i.e. column-based) ones. cuts out a ton of overhead when setting
non-object based attributes.
- InstanceState also used throughout the flush process, i.e. dependency.py,
mapper.save_obj()/delete_obj(), sync.execute() all expect InstanceState objects
in most cases now.
- mapper/property cascade_iterator() takes InstanceState as its argument,
but still returns lists of object instances so that they are not dereferenced.
- a few tricks needed when dealing with InstanceState, i.e. when loading a list
of items that are possibly fresh from the DB, you *have* to get the actual objects
into a strong-referencing datastructure else they fall out of scope immediately.
dependency.py caches lists of dependent objects which it loads now (i.e. history
collections).
- AttributeHistory is gone, replaced by a function that returns a 3-tuple of
added, unchanged, deleted. these collections still reference the object
instances directly for the strong-referencing reasons mentiontioned, but
it uses less IdentitySet logic to generate.
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mapper.get_attr_by_column(), mapper.set_attr_by_column(),
mapper.pks_by_table, mapper.cascade_callable(),
MapperProperty.cascade_callable(), mapper.canload()
- refinements to mapper PK/table column organization, session cascading,
some naming convention work
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use a common traversal function.
- TranslatingDict is finally gone, thanks to column.proxy_set simpleness...hooray !
- shoved "slice" use case on RowProxy into an exception case. knocks noticeable time off of large result set operations.
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ColumnLoader to create the row processor
- eager loaders ensure deferred foreign key cols are present in the primary list of columns (and secondary...). because eager loading with LIMIT/OFFSET doesn't re-join to the parent table anymore this is now necessary. [ticket:864]
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once and is
then re-used. the FROM calculation of a Select normalizes the list of hide_froms against all
previous incarnations of each FROM clause, using a tag attached from cloned clause to
previous.
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CompoundSelects
may extend from more than one root column.
- keys_ok argument from corresponding_column() removed. no more name-based matching of columns anywhere.
- DictDecorator is gone. all row translators provided by orm.util.create_row_adapter(). Mapper
and contains_alias() cache the adapters on target mapper to avoid re-computation of adapters.
- create_row_adapter() accepts an "equivalent_columns" map as produced by Mapper, so that
row adapters can take join conditions into account (as usual again, to help with the CompoundSelects
produced by polymorphic_union).
- simplified TableSingleton to just provide lookup; moved all initialization into Table.
- the "properties" accessor on Mapper is removed; it now throws an informative
exception explaining the usage of mapper.get_property() and
mapper.iterate_properties
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much simpler
and "correct" version which will copy all elements exactly once, except for those which were
replaced with target elements. It also can match a wider variety of target elements including
joins and selects on identity alone.
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- removed ClauseParameters object; compiled.params returns a regular dictionary
now, as well as result.last_inserted_params()/last_updated_params().
- various code trimming, method removals.
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Big drop in function count for inserts (22%) with about a 3% wall clock improvement.
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- implemented jek's ClauseParameters optimization for named params
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(some sql operations faster by nearly 10% wallclock, general orm around 3%)
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2. compiler names changed to be less verbose, unused classes removed.
3. Methods on Dialect which return compilers, schema generators, identifier preparers
have changed to direct class references, typically on the Dialect class itself
or optionally as attributes on an individual Dialect instance if conditional behavior is needed.
This takes away the need for Dialect subclasses to know how to instantiate these
objects, and also reduces method overhead by one call for each one.
4. as a result of 3., some internal signatures have changed for things like compiler() (now statement_compiler()), preparer(), etc., mostly in that the dialect needs to be passed explicitly as the first argument (since they are just class references now). The compiler() method on Engine and Connection is now also named statement_compiler(), but as before does not take the dialect as an argument.
5. changed _process_row function on RowProxy to be a class reference, cuts out 50K method calls from insertspeed.py
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