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Code Issues 25 Releases Wiki Activity

Refs #30158 -- Removed alias argument for Expression.get_group_by_cols().

Browse Source 
Recent refactors allowed GROUP BY aliasing allowed for aliasing to be
entirely handled by the sql.Query.set_group_by and compiler layers.
This commit is contained in:
Simon Charette 2022-09-28 10:51:06 -04:00 committed by Mariusz Felisiak
parent b7b28c7c18
commit c6350d594c
9 changed files with 43 additions and 37 deletions
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2
django/db/models/aggregates.py
View File

@ -97,7 +97,7 @@ class Aggregate(Func):
return "%s__%s" % (expressions[0].name, self.name.lower())
raise TypeError("Complex expressions require an alias")
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
return []
def as_sql(self, compiler, connection, **extra_context):

38
django/db/models/expressions.py
View File

@ -417,10 +417,8 @@ class BaseExpression:
)
return clone
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
if not self.contains_aggregate:
if alias:
return [Ref(alias, self)]
return [self]
cols = []
for source in self.get_source_expressions():
@ -858,7 +856,7 @@ class ResolvedOuterRef(F):
def relabeled_clone(self, relabels):
return self
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
return []
@ -1021,7 +1019,7 @@ class Value(SQLiteNumericMixin, Expression):
c.for_save = for_save
return c
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
return []
def _resolve_output_field(self):
@ -1066,7 +1064,7 @@ class RawSQL(Expression):
def as_sql(self, compiler, connection):
return "(%s)" % self.sql, self.params
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
return [self]
def resolve_expression(
@ -1124,7 +1122,7 @@ class Col(Expression):
relabels.get(self.alias, self.alias), self.target, self.output_field
)
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
return [self]
def get_db_converters(self, connection):
@ -1167,7 +1165,7 @@ class Ref(Expression):
def as_sql(self, compiler, connection):
return connection.ops.quote_name(self.refs), []
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
return [self]
@ -1238,14 +1236,14 @@ class ExpressionWrapper(SQLiteNumericMixin, Expression):
def get_source_expressions(self):
return [self.expression]
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
if isinstance(self.expression, Expression):
expression = self.expression.copy()
expression.output_field = self.output_field
return expression.get_group_by_cols(alias=alias)
return expression.get_group_by_cols()
# For non-expressions e.g. an SQL WHERE clause, the entire
# `expression` must be included in the GROUP BY clause.
return super().get_group_by_cols(alias=alias)
return super().get_group_by_cols()
def as_sql(self, compiler, connection):
return compiler.compile(self.expression)
@ -1330,7 +1328,7 @@ class When(Expression):
*result_params,
)
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
# This is not a complete expression and cannot be used in GROUP BY.
cols = []
for source in self.get_source_expressions():
@ -1426,10 +1424,10 @@ class Case(SQLiteNumericMixin, Expression):
sql = connection.ops.unification_cast_sql(self.output_field) % sql
return sql, sql_params
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
if not self.cases:
return self.default.get_group_by_cols(alias)
return super().get_group_by_cols(alias)
return self.default.get_group_by_cols()
return super().get_group_by_cols()
class Subquery(BaseExpression, Combinable):
@ -1480,8 +1478,8 @@ class Subquery(BaseExpression, Combinable):
sql = template % template_params
return sql, sql_params
def get_group_by_cols(self, alias=None):
return self.query.get_group_by_cols(alias=alias, wrapper=self)
def get_group_by_cols(self):
return self.query.get_group_by_cols(wrapper=self)
class Exists(Subquery):
@ -1602,7 +1600,7 @@ class OrderBy(Expression):
return copy.as_sql(compiler, connection)
return self.as_sql(compiler, connection)
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
cols = []
for source in self.get_source_expressions():
cols.extend(source.get_group_by_cols())
@ -1732,7 +1730,7 @@ class Window(SQLiteNumericMixin, Expression):
def __repr__(self):
return "<%s: %s>" % (self.__class__.__name__, self)
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
group_by_cols = []
if self.partition_by:
group_by_cols.extend(self.partition_by.get_group_by_cols())
@ -1780,7 +1778,7 @@ class WindowFrame(Expression):
def __repr__(self):
return "<%s: %s>" % (self.__class__.__name__, self)
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
return []
def __str__(self):

2
django/db/models/functions/math.py
View File

@ -169,7 +169,7 @@ class Random(NumericOutputFieldMixin, Func):
def as_sqlite(self, compiler, connection, **extra_context):
return super().as_sql(compiler, connection, function="RAND", **extra_context)
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
return []

2
django/db/models/lookups.py
View File

@ -128,7 +128,7 @@ class Lookup(Expression):
def rhs_is_direct_value(self):
return not hasattr(self.rhs, "as_sql")
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
cols = []
for source in self.get_source_expressions():
cols.extend(source.get_group_by_cols())

19
django/db/models/sql/query.py
View File

@ -1147,13 +1147,11 @@ class Query(BaseExpression):
if col.alias in self.external_aliases
]
def get_group_by_cols(self, alias=None, wrapper=None):
def get_group_by_cols(self, wrapper=None):
# If wrapper is referenced by an alias for an explicit GROUP BY through
# values() a reference to this expression and not the self must be
# returned to ensure external column references are not grouped against
# as well.
if alias:
return [Ref(alias, wrapper or self)]
external_cols = self.get_external_cols()
if any(col.possibly_multivalued for col in external_cols):
return [wrapper or self]
@ -2247,11 +2245,16 @@ class Query(BaseExpression):
self.select = tuple(values_select.values())
self.values_select = tuple(values_select)
group_by = list(self.select)
if self.annotation_select:
for alias, annotation in self.annotation_select.items():
if not allow_aliases or alias in column_names:
alias = None
group_by_cols = annotation.get_group_by_cols(alias=alias)
for alias, annotation in self.annotation_select.items():
if not (group_by_cols := annotation.get_group_by_cols()):
continue
if (
allow_aliases
and alias not in column_names
and not annotation.contains_aggregate
):
group_by.append(Ref(alias, annotation))
else:
group_by.extend(group_by_cols)
self.group_by = tuple(group_by)

2
django/db/models/sql/where.py
View File

@ -178,7 +178,7 @@ class WhereNode(tree.Node):
sql_string = "(%s)" % sql_string
return sql_string, result_params
def get_group_by_cols(self, alias=None):
def get_group_by_cols(self):
cols = []
for child in self.children:
cols.extend(child.get_group_by_cols())

9
docs/ref/models/expressions.txt
View File

@ -1036,13 +1036,16 @@ calling the appropriate methods on the wrapped expression.
``expression`` is the same as ``self``.
.. method:: get_group_by_cols(alias=None)
.. method:: get_group_by_cols()
Responsible for returning the list of columns references by
this expression. ``get_group_by_cols()`` should be called on any
nested expressions. ``F()`` objects, in particular, hold a reference
to a column. The ``alias`` parameter will be ``None`` unless the
expression has been annotated and is used for grouping.
to a column.
.. versionchanged:: 4.2
The ``alias=None`` keyword argument was removed.
.. method:: asc(nulls_first=None, nulls_last=None)

2
docs/releases/4.2.txt
View File

@ -329,6 +329,8 @@ Miscellaneous
* The :option:`makemigrations --check` option no longer creates missing
migration files.
* The ``alias`` argument for :meth:`.Expression.get_group_by_cols` is removed.
.. _deprecated-features-4.2:
Features deprecated in 4.2

4
tests/expressions/tests.py
View File

@ -2525,13 +2525,13 @@ class CombinedExpressionTests(SimpleTestCase):
class ExpressionWrapperTests(SimpleTestCase):
def test_empty_group_by(self):
expr = ExpressionWrapper(Value(3), output_field=IntegerField())
self.assertEqual(expr.get_group_by_cols(alias=None), [])
self.assertEqual(expr.get_group_by_cols(), [])
def test_non_empty_group_by(self):
value = Value("f")
value.output_field = None
expr = ExpressionWrapper(Lower(value), output_field=IntegerField())
group_by_cols = expr.get_group_by_cols(alias=None)
group_by_cols = expr.get_group_by_cols()
self.assertEqual(group_by_cols, [expr.expression])
self.assertEqual(group_by_cols[0].output_field, expr.output_field)