Metadata propagation method for graph structure data

    公开(公告)号:US12086190B2

    公开(公告)日:2024-09-10

    申请号:US17862038

    申请日:2022-07-11

    申请人: Hitachi, Ltd.

    发明人: Kazuhide Aikoh

    摘要: A method for determining metadata propagation generated by an Extract, Transfer, Load (ETL) process. The method may include categorizing metadata given to data sources to generalize the metadata and categorizing the ETL process to generalize the ETL process; defining propagation rules for the generalized metadata and generalized ETL process; and generating metadata for ETL-converted data based on the categorization of the generalized metadata and generalized ETL process, and corresponding ones of the propagation rules.

    Query processing using hybrid table secondary indexes

    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.

    IPC分类号: G06F16/22 G06F16/28

    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.