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公开(公告)号：US12061587B2
公开(公告)日：2024-08-13
申请号：US18171296
申请日：2023-02-17
申请人： Snowflake Inc.
CPC分类号： G06F16/2272 , G06F16/2264 , G06F16/283 , G06F16/284
摘要： The subject technology obtains a read timestamp of a first transaction. The subject technology performs a first read operation on a parent table associated with the first transaction to determine a set of committed versions of the parent table. The subject technology determines whether a key exists in the parent table based on the first transaction. The subject technology, in response to the key existing in the parent table, performs a first write operation on a child table. The subject technology determines whether a duplicate key exists in the child table. The subject technology, in response to determining that there is no duplicate key in the child table, determines whether there is a conflict with the key. The subject technology, in response to determining that there is no conflict with the key, performs a second write operation on a secondary index table of the child table.
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2.发明公开公开(公告)号：US20240104116A1
公开(公告)日：2024-03-28
申请号：US18524784
申请日：2023-11-30
申请人： Snowflake Inc.
CPC分类号： G06F16/283 , G06F16/2264 , G06F16/284
摘要： The subject technology generates a nested object based on a set of metadata, the set of metadata including information linking the nested object to a table object associated with a base table. The subject technology generates a second table object associated with the nested object, the second table object representing a secondary index of the base table, the second table object including information linking the second table object to the nested object. The subject technology generates a second nested object based on a particular set of metadata, the particular set of metadata including information linking the second nested object to the table object. The subject technology generates a third table object associated with the second nested object, the third table object representing a particular secondary index of the base table, the third table object including information linking the third table object to the second nested object.
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3.发明公开公开(公告)号：US20230401236A1
公开(公告)日：2023-12-14
申请号：US18171292
申请日：2023-02-17
申请人： Snowflake Inc.
CPC分类号： G06F16/283 , G06F16/284 , G06F16/2264
摘要： The subject technology receives, from a metadata database, information related to a base table. The subject technology determines a table object associated with the base table, the table object including a first set of metadata. The subject technology generates a nested object based on a second set of metadata, the second set of metadata including information linking the nested object to the table object. The subject technology generates a second table object associated with the nested object, the second table object representing a secondary index of the base table, the second table object including information linking the second table object to the nested object. The subject technology establishes a link between the second table object to the base table based on the nested object. The subject technology stores, in the metadata database, the nested object and the second table object.
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公开(公告)号：US20230205785A1
公开(公告)日：2023-06-29
申请号：US18171297
申请日：2023-02-17
申请人： Snowflake Inc.
CPC分类号： G06F16/273 , G06F9/466
摘要： The subject technology receives, by a distributed database, transactional queries against a key-value database comprising data managed by key-value pairs. The subject technology performs, using asynchronous threads of execution nodes of the distributed database, asynchronous transformation and compaction of key-value pairs of data that corresponds to the plurality of transactional queries. The subject technology performs, using asynchronous threads of execution nodes of the distributed database, asynchronous transformation and compaction of a set of secondary indexes that corresponds to the plurality of transactional queries. The subject technology processes, using transactional threads in the execution nodes, the plurality of transactional queries to generate results data, the asynchronous threads performing the asynchronous transformation and compaction while the transactional threads generate the results data.
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公开(公告)号：US12093248B1
公开(公告)日：2024-09-17
申请号：US18313768
申请日：2023-05-08
申请人： Snowflake Inc.
发明人： Cristian Diaconu , Nikolaos Romanos Katsipoulakis , Alexander Miller , Dimitrios Tsirogiannis , William Waddington , Zhaohui Zhang
CPC分类号： G06F16/2379 , G06F16/22 , G06F16/2365
摘要： The subject technology receives a statement to initiate an online index building process of an index. The subject technology determines that the index can be generated. The subject technology performs a write operation to store an index record indicating an initial status of the online index building process. The subject technology performs a statement fencing process. The subject technology performs a back-filling process of the index. The subject technology validates the index.
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公开(公告)号：US12007990B1
公开(公告)日：2024-06-11
申请号：US18447934
申请日：2023-08-10
申请人： Snowflake Inc.
IPC分类号： G06F16/00 , G06F16/2453 , G06F16/27
CPC分类号： G06F16/24537 , G06F16/24542 , G06F16/27
摘要： The subject technology receives a query, the query including a set of statements, the set of statements including a first statement comprising a first data manipulation language operation. The subject technology determines that the set of statements includes at least one statement defining a first constraint, and a second statement indicating that the first constraint is statement deferrable for performing validation of the first constraint. The subject technology generates a key value constraint check operator as a node in a query plan. The subject technology generates a key value DML operator as a second node in the query plan, the key value DML operator corresponding to the first DML operation. The subject technology performs, using the key value constraint check operator, a validation process of the first constraint based at least in part on a set of violating keys of each DML operation from the set of statements.
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7.发明授权公开(公告)号：US11880388B2
公开(公告)日：2024-01-23
申请号：US18171292
申请日：2023-02-17
申请人： Snowflake Inc.
CPC分类号： G06F16/283 , G06F16/2264 , G06F16/284
摘要： The subject technology receives, from a metadata database, information related to a base table. The subject technology determines a table object associated with the base table, the table object including a first set of metadata. The subject technology generates a nested object based on a second set of metadata, the second set of metadata including information linking the nested object to the table object. The subject technology generates a second table object associated with the nested object, the second table object representing a secondary index of the base table, the second table object including information linking the second table object to the nested object. The subject technology establishes a link between the second table object to the base table based on the nested object. The subject technology stores, in the metadata database, the nested object and the second table object.
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公开(公告)号：US20230401189A1
公开(公告)日：2023-12-14
申请号：US18171296
申请日：2023-02-17
申请人： Snowflake Inc.
CPC分类号： G06F16/2272 , G06F16/283
摘要： The subject technology obtains a read timestamp of a first transaction. The subject technology performs a first read operation on a parent table associated with the first transaction to determine a set of committed versions of the parent table. The subject technology determines whether a key exists in the parent table based on the first transaction. The subject technology, in response to the key existing in the parent table, performs a first write operation on a child table. The subject technology determines whether a duplicate key exists in the child table. The subject technology, in response to determining that there is no duplicate key in the child table, determines whether there is a conflict with the key. The subject technology, in response to determining that there is no conflict with the key, performs a second write operation on a secondary index table of the child table.
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