carrotquest/django-clickhouse
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M1ha 2021-10-05 16:50:27 +05:00
parent 1ed7f5ea60
commit 9ce7c7ff1c
1 changed files with 9 additions and 2 deletions
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11
src/django_clickhouse/engines.py
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@ -58,6 +58,7 @@ class CollapsingMergeTree(InsertOnlyEngineMixin, infi_engines.CollapsingMergeTre
:param object_pks: Objects primary keys to filter by :param object_pks: Objects primary keys to filter by
:param columns: Columns to fetch :param columns: Columns to fetch
:param date_range_filter: Optional date_range_filter which speeds up query if date_col is set :param date_range_filter: Optional date_range_filter which speeds up query if date_col is set
:return: List of named tuples with requested columns
""" """
if date_range_filter: if date_range_filter:
date_range_filter = 'PREWHERE {}'.format(date_range_filter) date_range_filter = 'PREWHERE {}'.format(date_range_filter)
@ -83,6 +84,7 @@ class CollapsingMergeTree(InsertOnlyEngineMixin, infi_engines.CollapsingMergeTre
:param object_pks: Objects primary keys to filter by :param object_pks: Objects primary keys to filter by
:param columns: Columns to fetch :param columns: Columns to fetch
:param date_range_filter: Optional date_range_filter which speeds up query if date_col is set :param date_range_filter: Optional date_range_filter which speeds up query if date_col is set
:return: List of named tuples with requested columns
""" """
if date_range_filter: if date_range_filter:
date_range_filter += ' AND' date_range_filter += ' AND'
@ -98,7 +100,12 @@ class CollapsingMergeTree(InsertOnlyEngineMixin, infi_engines.CollapsingMergeTre
def _get_date_rate_filter(self, objects, model_cls: Type[ClickHouseModel], db_alias: str, def _get_date_rate_filter(self, objects, model_cls: Type[ClickHouseModel], db_alias: str,
date_col: Optional[str]) -> str: date_col: Optional[str]) -> str:
""" """
Generates Generates datetime filter to speed up final queries, if date_col is present
:param objects: Objects, which are inserted
:param model_cls: Model class for which data is fetched
:param db_alias: ClickHouse database alias used
:param date_col: Optional column name, where partition date is hold. Defaults to self.date_col
:return: String to add to WHERE or PREWHERE query section
""" """
def _dt_to_str(dt: Union[datetime.date, datetime.datetime]) -> str: def _dt_to_str(dt: Union[datetime.date, datetime.datetime]) -> str:
if isinstance(dt, datetime.datetime): if isinstance(dt, datetime.datetime):
@ -142,7 +149,7 @@ class CollapsingMergeTree(InsertOnlyEngineMixin, infi_engines.CollapsingMergeTre
It also supposes primary key to by self.pk_column It also supposes primary key to by self.pk_column
:param model_cls: ClickHouseModel subclass to import :param model_cls: ClickHouseModel subclass to import
:param objects: Objects for which final versions are searched :param objects: Objects for which final versions are searched
:param date_col: Optional column name, where partiion date is hold. Defaults to self.date_col :param date_col: Optional column name, where partition date is hold. Defaults to self.date_col
:return: A generator of named tuples, representing previous state :return: A generator of named tuples, representing previous state
""" """
if not objects: if not objects: