Refs #27624 -- Optimized sql.Query creation by moving immutable/singleton attributes to class attributes.
This commit is contained in:
Keryn Knight
Mariusz Felisiak
parent
5659015d3c
commit
6d5709ce7d
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@ -155,6 +155,66 @@ class Query(BaseExpression):
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base_table_class = BaseTable
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join_class = Join
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default_cols = True
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default_ordering = True
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standard_ordering = True
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filter_is_sticky = False
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subquery = False
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# SQL-related attributes.
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# Select and related select clauses are expressions to use in the SELECT
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# clause of the query. The select is used for cases where we want to set up
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# the select clause to contain other than default fields (values(),
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# subqueries...). Note that annotations go to annotations dictionary.
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select = ()
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# The group_by attribute can have one of the following forms:
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# - None: no group by at all in the query
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# - A tuple of expressions: group by (at least) those expressions.
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# String refs are also allowed for now.
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# - True: group by all select fields of the model
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# See compiler.get_group_by() for details.
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group_by = None
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order_by = ()
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low_mark = 0 # Used for offset/limit.
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high_mark = None # Used for offset/limit.
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distinct = False
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distinct_fields = ()
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select_for_update = False
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select_for_update_nowait = False
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select_for_update_skip_locked = False
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select_for_update_of = ()
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select_for_no_key_update = False
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select_related = False
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# Arbitrary limit for select_related to prevents infinite recursion.
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max_depth = 5
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# Holds the selects defined by a call to values() or values_list()
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# excluding annotation_select and extra_select.
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values_select = ()
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# SQL annotation-related attributes.
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annotation_select_mask = None
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_annotation_select_cache = None
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# Set combination attributes.
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combinator = None
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combinator_all = False
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combined_queries = ()
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# These are for extensions. The contents are more or less appended verbatim
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# to the appropriate clause.
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extra_select_mask = None
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_extra_select_cache = None
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extra_tables = ()
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extra_order_by = ()
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# A tuple that is a set of model field names and either True, if these are
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# the fields to defer, or False if these are the only fields to load.
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deferred_loading = (frozenset(), True)
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explain_info = None
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def __init__(self, model, alias_cols=True):
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self.model = model
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self.alias_refcount = {}
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@ -172,74 +232,17 @@ class Query(BaseExpression):
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# Map external tables to whether they are aliased.
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self.external_aliases = {}
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self.table_map = {} # Maps table names to list of aliases.
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self.default_cols = True
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self.default_ordering = True
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self.standard_ordering = True
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self.used_aliases = set()
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self.filter_is_sticky = False
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self.subquery = False
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# SQL-related attributes
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# Select and related select clauses are expressions to use in the
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# SELECT clause of the query.
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# The select is used for cases where we want to set up the select
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# clause to contain other than default fields (values(), subqueries...)
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# Note that annotations go to annotations dictionary.
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self.select = ()
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self.where = WhereNode()
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# The group_by attribute can have one of the following forms:
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# - None: no group by at all in the query
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# - A tuple of expressions: group by (at least) those expressions.
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# String refs are also allowed for now.
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# - True: group by all select fields of the model
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# See compiler.get_group_by() for details.
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self.group_by = None
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self.order_by = ()
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self.low_mark, self.high_mark = 0, None # Used for offset/limit
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self.distinct = False
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self.distinct_fields = ()
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self.select_for_update = False
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self.select_for_update_nowait = False
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self.select_for_update_skip_locked = False
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self.select_for_update_of = ()
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self.select_for_no_key_update = False
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self.select_related = False
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# Arbitrary limit for select_related to prevents infinite recursion.
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self.max_depth = 5
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# Holds the selects defined by a call to values() or values_list()
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# excluding annotation_select and extra_select.
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self.values_select = ()
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# SQL annotation-related attributes
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self.annotations = {} # Maps alias -> Annotation Expression
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self.annotation_select_mask = None
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self._annotation_select_cache = None
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# Set combination attributes
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self.combinator = None
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self.combinator_all = False
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self.combined_queries = ()
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# Maps alias -> Annotation Expression.
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self.annotations = {}
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# These are for extensions. The contents are more or less appended
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# verbatim to the appropriate clause.
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self.extra = {} # Maps col_alias -> (col_sql, params).
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self.extra_select_mask = None
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self._extra_select_cache = None
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self.extra_tables = ()
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self.extra_order_by = ()
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# A tuple that is a set of model field names and either True, if these
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# are the fields to defer, or False if these are the only fields to
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# load.
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self.deferred_loading = (frozenset(), True)
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self._filtered_relations = {}
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self.explain_info = None
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@property
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def output_field(self):
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if len(self.select) == 1:
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