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Fixed issue in lambda caching system where an element of a query that
produces no cache key, like a custom option or clause element, would still
populate the expression in the "lambda cache" inappropriately.
This was discovered as part of :ticket:`6887` but is a separate
issue.
References: #6887
Change-Id: I1665f4320254ddc63a0abf3088e9daeaffbd1840
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Adjusted ORM loader internals to no longer use the "lambda caching" system
that was added in 1.4, as well as repaired one location that was still
using the previous "baked query" system for a query. The lambda caching
system remains an effective way to reduce the overhead of building up
queries that have relatively fixed usage patterns. In the case of loader
strategies, the queries used are responsible for moving through lots of
arbitrary options and criteria, which is both generated and sometimes
consumed by end-user code, that make the lambda cache concept not any more
efficient than not using it, at the cost of more complexity. In particular
the problems noted by :ticket:`6881` and :ticket:`6887` are made
considerably less complicated by removing this feature internally.
Fixed an issue where the :class:`_orm.Bundle` construct would not create
proper cache keys, leading to inefficient use of the query cache. This
had some impact on the "selectinload" strategy and was identified as
part of :ticket:`6889`.
Added a Select._create_raw_select() method which essentially
performs ``__new__`` and then populates ``__dict__`` directly,
with no coercions. This saves most of the overhead time that
the lambda caching system otherwise seeks to avoid.
Includes removal of bakedquery from
mapper->_subclass_load_via_in() which was overlooked from
the 1.4 refactor.
Fixes: #6079
Fixes: #6889
Change-Id: Ieac2d9d709b71ec4270e5c121fbac6ac870e2bb1
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Adjusted the "from linter" warning feature to accommodate for a chain of
joins more than one level deep where the ON clauses don't explicitly match
up the targets, such as an expression such as "ON TRUE". This mode of use
is intended to cancel the cartesian product warning simply by the fact that
there's a JOIN from "a to b", which was not working for the case where the
chain of joins had more than one element.
this incurs a bit more compiler overhead that comes out in profiling
but is not extensive.
Added the "is_comparison" flag to the PostgreSQL "overlaps",
"contained_by", "contains" operators, so that they work in relevant ORM
contexts as well as in conjunction with the "from linter" feature.
Fixes: #6886
Change-Id: I078dc3fe6d4f7871ffe4ebac3e71e62f3f213d12
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Unify behaviour :class:`_schema.Enum` in native and non-native
implementations regarding the accepted values for an enum with
aliased elements.
When :paramref:`_schema.Enum.omit_aliases` is ``False`` all values,
alias included, are accepted as valid values.
When :paramref:`_schema.Enum.omit_aliases` is ``True`` only non aliased values
are accepted as valid values.
Fixes: #6146
Change-Id: I6f40789c1ca56e533990882deadcc6a377d4fc40
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Added new attribute :attr:`_sql.Select.columns_clause_froms` that will
retrieve the FROM list implied by the columns clause of the
:class:`_sql.Select` statement. This differs from the old
:attr:`_sql.Select.froms` collection in that it does not perform any ORM
compilation steps, which necessarily deannotate the FROM elements and do
things like compute joinedloads etc., which makes it not an appropriate
candidate for the :meth:`_sql.Select.select_from` method. Additionally adds
a new parameter
:paramref:`_sql.Select.with_only_columns.maintain_column_froms` that
transfers this collection to :meth:`_sql.Select.select_from` before
replacing the columns collection.
In addition, the :attr:`_sql.Select.froms` is renamed to
:meth:`_sql.Select.get_final_froms`, to stress that this collection is not
a simple accessor and is instead calculated given the full state of the
object, which can be an expensive call when used in an ORM context.
Additionally fixes a regression involving the
:func:`_orm.with_only_columns` function to support applying criteria to
column elements that were replaced with either
:meth:`_sql.Select.with_only_columns` or :meth:`_orm.Query.with_entities` ,
which had broken as part of :ticket:`6503` released in 1.4.19.
Fixes: #6808
Change-Id: Ib5d66cce488bbaca06dab4f68fb5cdaa73e8823e
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Fix issue in :class:`_sql.CTE` where new :meth:`_sql.HasCTE.add_cte` method
added in version 1.4.21 / :ticket:`6752` failed to function correctly for
"compound select" structures such as :func:`_sql.union`,
:func:`_sql.union_all`, :func:`_sql.except`, etc. Pull request courtesy
Eric Masseran.
Fixes: #6752
Closes: #6849
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/6849
Pull-request-sha: 1c4b4d72b2789cf89ff5043ca964ebdd6c9a6617
Change-Id: I49a16a4fc2af8299502011f3a02d8a2ad93255e3
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this appears to be unnecessary and prevents end-user
literal_binds case from working.
Fixed issue where the ``literal_binds`` compiler flag, as used externally
to render bound parameters inline, would fail to work when used with a
certain class of parameters known as "literal_execute", which covers things
like LIMIT and OFFSET values for dialects where the drivers don't allow a
bound parameter, such as SQL Server's "TOP" clause. The issue locally
seemed to affect only the MSSQL dialect.
Fixes: #6863
Change-Id: Ia74cff5b0107b129a11b9b965883552b2962e449
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Fixed an issue in the ``CacheKey.to_offline_string()`` method used by the
dogpile.caching example where attempting to create a proper cache key from
the special "lambda" query generated by the lazy loader would fail to
include the parameter values, leading to an incorrect cache key.
Fixes: #6858
Change-Id: Ice27087583c6f3ff79cf7d5b879e5dd0a4e58158
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Fixed issue where a bound parameter object that was "cloned" would cause a
name conflict in the compiler, if more than one clone of this parameter
were used at the same time in a single statement. This could occur in
particular with things like ORM single table inheritance queries that
indicated the same "discriminator" value multiple times in one query.
Fixes: #6824
Change-Id: Iba7a786fc5a2341ff7d07fc666d24ed790ad4fe8
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Fixes: #6804
Fixes: #6759
Change-Id: Ie7f32c38a22dbfa059b5709b883ff464b16031ae
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Fixed issue where usage of the :meth:`_result.Result.unique` method with an
ORM result that included column expressions with unhashable types, such as
``JSON`` or ``ARRAY`` using non-tuples would silently fall back to using
the ``id()`` function, rather than raising an error. This now raises an
error when the :meth:`_result.Result.unique` method is used in a 2.0 style
ORM query. Additionally, hashability is assumed to be True for result
values of unknown type, such as often happens when using SQL functions of
unknown return type; if values are truly not hashable then the ``hash()``
itself will raise.
For legacy ORM queries, since the legacy :class:`_orm.Query` object
uniquifies in all cases, the old rules remain in place, which is to use
``id()`` for result values of unknown type as this legacy uniquing is
mostly for the purpose of uniquing ORM entities and not column values.
Fixes: #6769
Change-Id: I5747f706f1e97c78867b5cf28c73360497273808
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Fixed issue where use of the :paramref:`_sql.case.whens` parameter passing
a dictionary positionally and not as a keyword argument would emit a 2.0
deprecation warning, referring to the deprecation of passing a list
positionally. The dictionary format of "whens", passed positionally, is
still supported and was accidentally marked as deprecated.
Removes warning filter for case statement.
Fixes: #6786
Change-Id: I8efd1882563773bec89ae5e34f0dfede77fc4683
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Fixed critical caching issue where the ORM's persistence feature using
INSERT..RETURNING would cache an incorrect query when mixing the "bulk
save" and standard "flush" forms of INSERT.
Fixes: #6793
Change-Id: Ifeb61c1226d3fa6d5e1c2e29b6f5ff77a27d6a2d
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Also remove deprecated usage:
- load_only does not accept strings
- case.whens is positional only
Ref #6712
Ref #5994
Ref #6121
Ref #6785
Ref https://groups.google.com/g/sqlalchemy/c/-cnhThEu3kk
Change-Id: I5db49a075b9d3d332518b9d189a24b13b502e2af
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Fixed issue in new :meth:`_schema.Table.table_valued` method where the
resulting :class:`_sql.TableValuedColumn` construct would not respond
correctly to alias adaptation as is used throughout the ORM, such as for
eager loading, polymorphic loading, etc.
Fixes: #6775
Change-Id: I77cec4b6e1b1003f2b6be242b54ada8e4a435250
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Fixed issue where type-specific bound parameter handlers would not be
called upon in the case of using the :meth:`_sql.Insert.values` method with
the Python ``None`` value; in particular, this would be noticed when using
the :class:`_types.JSON` datatype as well as related PostgreSQL specific
types such as :class:`_postgresql.JSONB` which would fail to encode the
Python ``None`` value into JSON null, however the issue was generalized to
any bound parameter handler in conjunction with this specific method of
:class:`_sql.Insert`.
The issue with coercions forcing out ``null()`` may still impact
SQL expression usage as well; the change here is limited to crud
as the behavior there is relevant to some use cases, which may
need to be evaluated separately.
Fixes: #6770
Change-Id: If53edad811b37dada7578a89daf395628db058a6
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Fixed regression which appeared in version 1.4.3 due to :ticket:`6060`
where rules that limit ORM adaptation of derived selectables interfered
with other ORM-adaptation based cases, in this case when applying
adaptations for a :func:`_orm.with_polymorphic` against a mapping which
uses a :func:`_orm.column_property` which in turn makes use of a scalar
select that includes a :func:`_orm.aliased` object of the mapped table.
Fixes: #6762
Change-Id: Ice3dc34b97d12b59f044bdc0c5faaefcc4015227
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Fixed issue in CTE constructs where a recursive CTE that referred to a
SELECT that has duplicate column names, which are typically deduplicated
using labeling logic in 1.4, would fail to refer to the deduplicated label
name correctly within the WITH clause.
As part of this change we are also attempting to remove the
behavior of SelectStatementGrouping forcing off the "asfrom"
contextual flag, which will have the result of additional labeling
being applied to some UNION and similar statements when they are
interpreted as subqueries. To maintain compatibility with
"grouping", the Grouping/SelectStatementGrouping are now broken
out into two separate compiler cases, as the "asfrom" logic appears
to be tailored towards table valued SELECTS as column expressions.
Fixes: #6710
Change-Id: I8af07a5c670dbe5736cd9f16084ef82f5e4c8642
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Fixed issue where a too-long constraint name rendered as part of the "ON
CONFLICT ON CONSTRAINT" element of the :class:`_postgresql.Insert`
construct due to naming convention generation would not correctly truncate
the name in the same way that it normally renders within a CREATE TABLE
statement, thus producing a non-matching and too-long constraint name.
Fixes: #6755
Change-Id: Ib27014a5ecbc9cd5861a396f8bb49fbc60bf49fe
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To service #6718 and #6710, the system by which columns are
given labels in a SELECT statement as well as the system that
gives them keys in a .c or .selected_columns collection have
been refactored to provide a single source of truth for
both, in constrast to the previous approach that included
similar logic repeated in slightly different ways.
Main ideas:
1. ColumnElement attributes ._label, ._anon_label, ._key_label
are renamed to include the letters "tq", meaning
"table-qualified" - these labels are only used when rendering
a SELECT that has LABEL_STYLE_TABLENAME_PLUS_COL for its
label style; as this label style is primarily legacy, the
"tq" names should be isolated so that in a 2.0 style application
these aren't being used at all
2. The means by which the "labels" and "proxy keys" for the elements
of a SELECT has been centralized to a single source of truth;
previously, the three of _generate_columns_plus_names,
_generate_fromclause_column_proxies, and _column_naming_convention
all had duplicated rules between them, as well as that there
were a little bit of labeling rules in compiler._label_select_column
as well; by this we mean that the various "anon_label" "anon_key"
methods on ColumnElement were called by all four of these methods,
where there were many cases where it was necessary that one method
comes up with the same answer as another of the methods. This
has all been centralized into _generate_columns_plus_names
for all the names except the "proxy key", which is generated
by _column_naming_convention.
3. compiler._label_select_column has been rewritten to both not make
any naming decisions nor any "proxy key" decisions, only whether
to label or not to label; the _generate_columns_plus_names method
gives it the information, where the proxy keys come from
_column_naming_convention; previously, these proxy keys were matched
based on restatement of similar (but not really the same) logic in
two places. The heuristics of "whether to label or not to label"
are also reorganized to be much easier to read and understand.
4. a new method compiler._label_returning_column is added for dialects
to use in their "generate returning columns" methods. A
github search reveals a small number of third party dialects also
doing this using the prior _label_select_column method so we
try to make sure _label_select_column continues to work the
exact same way for that specific use case; for the "SELECT" use
case it now needs
5. After some attempts to do it different ways, for the case where
_proxy_key is giving us some kind of anon label, we are hard
changing it to "_no_label" right now, as there's not currently
a way to fully match anonymized labels from stmt.c or
stmt.selected_columns to what will be in the result map. The
idea of "_no_label" is to encourage the user to use label('name')
for columns they want to be able to target by string name that
don't have a natural name.
Change-Id: I7a92a66f3a7e459ccf32587ac0a3c306650daf11
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Added new method :meth:`_sql.HasCTE.add_cte` to each of the
:func:`_sql.select`, :func:`_sql.insert`, :func:`_sql.update` and
:func:`_sql.delete` constructs. This method will add the given
:class:`_sql.CTE` as an "independent" CTE of the statement, meaning it
renders in the WITH clause above the statement unconditionally even if it
is not otherwise referenced in the primary statement. This is a popular use
case on the PostgreSQL database where a CTE is used for a DML statement
that runs against database rows independently of the primary statement.
Fixes: #6752
Change-Id: Ibf635763e40269cbd10f4c17e208850d8e8d0188
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Fixed regression where the :func:`_sql.tablesample` construct would fail to
be executable when constructed given a floating-point sampling value not
embedded within a SQL function.
Fixes: #6735
Change-Id: I557bcd4bdbffc4329ad69d5659ba99b1c8deb554
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Fixed issue where the PostgreSQL ``ENUM`` datatype as embedded in the
``ARRAY`` datatype would fail to emit correctly in create/drop when the
``schema_translate_map`` feature were also in use. Additionally repairs a
related issue where the same ``schema_translate_map`` feature would not
work for the ``ENUM`` datatype in combination with a ``CAST``, that's also
intrinsic to how the ``ARRAY(ENUM)`` combination works on the PostgreSQL
dialect.
Fixes: #6739
Change-Id: I44b1ad4db4af3acbf639aa422c46c22dd3b0d3a6
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Fixed ORM regression where ad-hoc label names generated for hybrid
properties and potentially other similar types of ORM-enabled expressions
would usually be propagated outwards through subqueries, allowing the name
to be retained in the final keys of the result set even when selecting from
subqueries. Additional state is now tracked in this case that isn't lost
when a hybrid is selected out of a Core select / subquery.
as we have removed things like column.label() from
ORM, since we now have to export the cols with the same names
as what we will render, experiment with giving a greater role
to the _proxy_key annotation so that a desired name can be
carried through more transarently.
Fixes: #6718
Change-Id: Icb313244c13ea1a8f58d3e05d07aa3e1039e15bf
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Also replace http://pypi.python.org/pypi with https://pypi.org/project
Change-Id: I84b5005c39969a82140706472989f2a30b0c7685
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Fixed regression where the special dotted-schema name handling for the SQL
Server dialect would not function correctly if the dotted schema name were
used within the ``schema_translate_map`` feature.
Fixes: #6697
Change-Id: Idb610755cbf8122e71223d5dd0a17fcb61b1b98d
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Fixed issue where passing ``None`` for the value of
:paramref:`_schema.Table.prefixes` would not store an empty list, but
rather the constant ``None``, which may be unexpected by third party
dialects. The issue is revealed by a usage in recent versions of Alembic
that are passing ``None`` for this value. Pull request courtesy Kai
Mueller.
Fixes: #6685
Closes: #6672
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/6672
Pull-request-sha: b79aca0ee4011b244978b35fed4c687ffbe56dc9
Change-Id: I758641c6fbde6f2607d074fecea7efa6728aeea0
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Add a impl parameter to :class:`_types.PickleType` constructor, allowing
any arbitary type to be used in place of the default implementation of
:class:`_types.LargeBinary`. Pull request courtesy jason3gb.
Fixes: #6646
Closes: #6657
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/6657
Pull-request-sha: e49bcd368d1f71dba92225d8d6e3af2bbe7142f7
Change-Id: Ib79f3b0ebbc94393f673f5a5ba6558260083d0cf
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Fixed the class hierarchy for the :class:`_schema.Sequence` and the more
general :class:`_schema.DefaultGenerator` base, as these are "executable"
as statements they need to include :class:`_sql.Executable` in their
hierarchy, not just :class:`_roles.StatementRole` as was applied
arbitrarily to :class:`_schema.Sequence` previously. The fix allows
:class:`_schema.Sequence` to work in all ``.execute()`` methods including
with :meth:`_orm.Session.execute` which was not working in the case that a
``do_orm_execute()`` handler was also established.
Fixes: #6668
Change-Id: I0d192258c7cbd1bce2552f9e748e8fdd680dc45f
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Fixed old issue where a :func:`_sql.select()` made against the token "*",
which then yielded exactly one column, would fail to correctly organize the
``cursor.description`` column name into the keys of the result object.
Fixes: #6665
Change-Id: Ie8c00f62998972ad4a19a750d2642d00fde006f6
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Refined the behavior of ORM subquery rendering with regards to deferred
columns and column properties to be more compatible with that of 1.3 while
also providing for 1.4's newer features. As a subquery in 1.4 does not make
use of loader options, including :func:`_orm.deferred`, a subquery that is
against an ORM entity with deferred attributes will now render those
deferred attributes that refer directly to mapped table columns, as these
are needed in the outer SELECT if that outer SELECT makes use of these
columns; however a deferred attribute that refers to a composed SQL
expression as we normally do with :func:`_orm.column_property` will not be
part of the subquery, as these can be selected explicitly if needed in the
subquery. If the entity is being SELECTed from this subquery, the column
expression can still render on "the outside" in terms of the derived
subquery columns. This produces essentially the same behavior as when
working with 1.3. However in this case the fix has to also make sure that
the ``.selected_columns`` collection of an ORM-enabled :func:`_sql.select`
also follows these rules, which in particular allows recursive CTEs to
render correctly in this scenario, which were previously failing to render
correctly due to this issue.
As part of this change the _exported_columns_iterator() method has been
removed and logic simplified to use ._all_selected_columns from any
SelectBase object where _exported_columns_iterator() was used before.
Additionally sets up UpdateBase to include ReturnsRows in its hierarchy;
the literal point of ReturnsRows was to be a common base for UpdateBase
and SelectBase so it was kind of weird it wasn't there.
Fixes: #6661
Fixed issue in CTE constructs mostly relevant to ORM use cases where a
recursive CTE against "anonymous" labels such as those seen in ORM
``column_property()`` mappings would render in the
``WITH RECURSIVE xyz(...)`` section as their raw internal label and not a
cleanly anonymized name.
Fixes: #6663
Change-Id: I26219d4d8e6c0915b641426e9885540f74fae4d2
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Added new construct :class:`_mysql.match`, which provides for the full
range of MySQL's MATCH operator including multiple column support and
modifiers. Pull request courtesy Anton Kovalevich.
Fixes: #6132
Closes: #6133
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/6133
Pull-request-sha: dc6842f13688849a848e2ecbb81600e6edf8b3a9
Change-Id: I66bbfd7947aa2e43a031772e9b5ae238d94e5223
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Fixed further regressions in the same area as that of :ticket:`6052` where
loader options as well as invocations of methods like
:meth:`_orm.Query.join` would fail if the left side of the statement for
which the option/join depends upon were replaced by using the
:meth:`_orm.Query.with_entities` method, or when using 2.0 style queries
when using the :meth:`_sql.Select.with_only_columns` method. A new set of
state has been added to the objects which tracks the "left" entities that
the options / join were made against which is memoized when the lead
entities are changed.
Fixes: #6503
Fixes: #6253
Change-Id: I211b2af98b0b20d1263fb15dc513884dcc5de6a4
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add additional notes regarding the methods that are on this
object.
Fixes: #6629
Change-Id: I68446cb16cbfcef9af9c2998687b3b536607cf0d
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Fixed issue where query production for joinedload against a complex left
hand side involving joined-table inheritance could fail to produce a
correct query, due to a clause adaption issue.
Fixes: #6595
Change-Id: Id4b839d52447cdc103b392dd8946c4cfa7a829e1
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