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    REGULAR EXPRESSION SEARCH QUERY PROCESSING USING PRUNING INDEX
    2.
    发明公开
    REGULAR EXPRESSION SEARCH QUERY PROCESSING USING PRUNING INDEX 审中-公开

    公开(公告)号：US20230342362A1

    公开(公告)日：2023-10-26

    申请号：US18305993

    申请日：2023-04-24

    Applicant: Snowflake Inc.

    Inventor： Thierry Cruanes ,  Ismail Oukid ,  Stefan Richter ,  Alejandro Salinger

    IPC: G06F16/2455 ,  G06F16/9035 ,  G06F16/28 ,  G06F16/22

    CPC classification number: G06F16/24557 ,  G06F16/9035 ,  G06F16/283 ,  G06F16/2272

    Abstract: A query directed at a source table organized into a set of batch units is received. The query comprises a regular expression search pattern. The regular expression search pattern is converted to a pruning index predicate comprising a set of substring literals extracted from the regular expression search pattern. A set of N-grams is generated based on the set of substring literals extracted from the regular expression search pattern. A pruning index associated with the source table is accessed. The pruning index indexes distinct N-grams in each column of the source table. A subset of batch units to scan for data matching the query are identified based on the pruning index and the set of N-grams. The query is processed by scanning the subset of batch units.

    SCAN SET PRUNING FOR QUERIES WITH PREDICATES ON SEMI-STRUCTURED FIELDS
    3.
    发明申请
    SCAN SET PRUNING FOR QUERIES WITH PREDICATES ON SEMI-STRUCTURED FIELDS 有权

    公开(公告)号：US20230064151A1

    公开(公告)日：2023-03-02

    申请号：US18047595

    申请日：2022-10-18

    Applicant: Snowflake Inc.

    Inventor： Mahmud Allahverdiyev ,  Thierry Cruanes ,  Ismail Oukid ,  Stefan Richter

    IPC: G06F16/2455 ,  G06F16/9035 ,  G06F16/28 ,  G06F17/18 ,  G06F16/22

    Abstract: A source table organized into a set of batch units is accessed. The source table comprises a column of data corresponding to a semi-structured data type. One or more indexing transformations for an object in the column are generated. The generating of the one or more indexing transformation includes converting the object to one or more stored data types. A pruning index is generated for the source table based in part on the one or more indexing transformations. The pruning index comprises a set of filters that index distinct values in each column of the source table, and each filter corresponds to a batch unit in the set of batch units. The pruning index is stored in a database with an association with the source table.

    JOIN QUERY PROCESSING USING PRUNING INDEX
    6.
    发明申请
    JOIN QUERY PROCESSING USING PRUNING INDEX 有权

    公开(公告)号：US20220292098A1

    公开(公告)日：2022-09-15

    申请号：US17804630

    申请日：2022-05-31

    Applicant: Snowflake Inc.

    Inventor： Max Heimel ,  Ismail Oukid ,  Linnea Passing ,  Stefan Richter ,  Juliane K. Waack

    IPC: G06F16/2455 ,  G06F16/9035 ,  G06F16/28 ,  G06F17/18 ,  G06F16/22

    Abstract: A query directed at a table organized into a set of batch units is received. The query comprises a predicate for which values are unknown prior to runtime. A set of values for the predicate are determined based on the query. An index access plan is created based on the set of values. Based on the index access plan, the set of batch units are pruned using a pruning index associated with the table. The pruning index comprises a set of filters that index distinct values in each column of the table. The pruning of the set of batch units comprises identifying a subset of batch units to scan for data that satisfies the query. The subset of batch units of the table are scanned to identify data that satisfies the query.

    Prefix N-gram indexing
    7.
    发明授权
    Prefix N-gram indexing 有权

    公开(公告)号：US11275738B2

    公开(公告)日：2022-03-15

    申请号：US17484817

    申请日：2021-09-24

    Applicant: Snowflake Inc.

    Inventor： Ismail Oukid ,  Stefan Richter

    IPC: G06F16/24 ,  G06F16/2455 ,  G06F16/9035 ,  G06F16/28 ,  G06F16/22 ,  G06F17/18

    Abstract: A table organized into a set of batch units is accessed. A set of N-grams are generated for a data value in the source table. The set of N-grams include a first N-gram of a first length and a second N-gram of a second length where the first N-gram corresponds to a prefix of the second N-gram. A set of fingerprints are generated for the data value based on the set of N-grams. The set of fingerprints include a first fingerprint generated based on the first N-gram and a second fingerprint generated based on the second N-gram and the first fingerprint. A pruning index that indexes distinct values in each column of the source table is generated based on the set of fingerprints and stored in a database with an association with the source table.

    PRUNING INDEX GENERATION FOR PATTERN MATCHING QUERIES
    8.
    发明申请
    PRUNING INDEX GENERATION FOR PATTERN MATCHING QUERIES 有权

    公开(公告)号：US20210357411A1

    公开(公告)日：2021-11-18

    申请号：US17388160

    申请日：2021-07-29

    Applicant: Snowflake Inc.

    Inventor： Thierry Cruanes ,  Benoit Dageville ,  Ismail Oukid ,  Stefan Richter

    IPC: G06F16/2455 ,  G06F16/9035 ,  G06F16/28 ,  G06F16/22 ,  G06F17/18

    Abstract: A query directed at a source table organized into a set of batch units is received. The query includes a pattern matching predicate that specifies a search pattern. A set of N-grams are generated based on the search pattern. A pruning index associated with the source table is accessed. The pruning index comprises a set of filters that index distinct N-grams in each column of the source table. The pruning index is used to identify a subset of batch units to scan for matching data based on the set of N-grams generated for the search pattern. The query is processed by scanning the subset of batch units.

    Database query processing using a pruning index
    9.
    发明授权
    Database query processing using a pruning index 有权

    公开(公告)号：US11086875B2

    公开(公告)日：2021-08-10

    申请号：US17161115

    申请日：2021-01-28

    Applicant: Snowflake Inc.

    Inventor： Thierry Cruanes ,  Benoit Dageville ,  Ismail Oukid ,  Stefan Richter

    IPC: G06F16/24 ,  G06F16/2455 ,  G06F16/22 ,  G06F17/18 ,  G06F16/28 ,  G06F16/9035

    Abstract: A source table organized into a set of micro-partitions is accessed by a network-based data warehouse. A pruning index is generated based on the source table. The pruning index comprises a set of filters that indicate locations of distinct values in each column of the source table. A query directed at the source table is received at the network-based data warehouse. The query is processed using the pruning index. The processing of the query comprises pruning the set of micro-partitions of the source table to scan for data matching the query, the pruning of the plurality of micro-partitions comprising identifying, using the pruning index, a sub-set of micro-partitions to scan for the data matching the query.

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