公开(公告)号：US20210200772A1

公开(公告)日：2021-07-01

申请号：US17161115

申请日：2021-01-28

Applicant: Snowflake Inc.

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

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

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.

公开(公告)号：US10942925B1

公开(公告)日：2021-03-09

申请号：US16932462

申请日：2020-07-17

Applicant: Snowflake Inc.

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

IPC: G06F16/20 ,  G06F16/2455 ,  G06F16/9035 ,  G06F16/28 ,  G06F16/22 ,  G06F17/18

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.

公开(公告)号：US20240168953A1

公开(公告)日：2024-05-23

申请号：US18534382

申请日：2023-12-08

Applicant: Snowflake Inc.

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

IPC: G06F16/2455 ,  G06F16/2457

CPC classification number: G06F16/24557 ,  G06F16/24578

Abstract: A top K query directed at a table is received. The table is organized into multiple storage units. The top K query comprises a first clause to sort a result set in order and a second clause that specifies a limit on a number of results provided in response to the query. A table scan operator identifies a first set of rows from the table based on a scan set determined for the table and provides the first set of rows to a top K operator. The top K operator determines a current boundary based on the first set of rows and provides the current boundary to the table scan operator. The table scan operator prunes the scan set based on the current boundary and identifies a second set of rows from the table based on the pruning.

公开(公告)号：US11734280B2

公开(公告)日：2023-08-22

申请号：US17654887

申请日：2022-03-15

Applicant: Snowflake Inc.

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

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

CPC classification number: G06F16/24557 ,  G06F16/2272 ,  G06F16/283 ,  G06F16/9035 ,  G06F17/18

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.

公开(公告)号：US11681708B2

公开(公告)日：2023-06-20

申请号：US17934977

申请日：2022-09-23

Applicant: Snowflake Inc.

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

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

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

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.

公开(公告)号：US20230084069A1

公开(公告)日：2023-03-16

申请号：US17934977

申请日：2022-09-23

Applicant: Snowflake Inc.

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

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 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.

公开(公告)号：US11494384B2

公开(公告)日：2022-11-08

申请号：US17655124

申请日：2022-03-16

Applicant: Snowflake Inc.

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

IPC: G06F16/24 ,  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.

公开(公告)号：US11487763B2

公开(公告)日：2022-11-01

申请号：US17649642

申请日：2022-02-01

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.

公开(公告)号：US20220156264A1

公开(公告)日：2022-05-19

申请号：US17649642

申请日：2022-02-01

Applicant: Snowflake Inc.

Inventor： Ismail Oukid ,  Stefan Richter

IPC: 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.

公开(公告)号：US11321325B2

公开(公告)日：2022-05-03

申请号：US17388160

申请日：2021-07-29

Applicant: Snowflake Inc.

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

IPC: G06F16/24 ,  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.