公开(公告)号：US10997174B2

公开(公告)日：2021-05-04

申请号：US14947927

申请日：2015-11-20

Applicant: SAP SE

Inventor： Sang Il Song ,  Junhee Woo ,  Taehyung Lee ,  Sung Heun Wi ,  Ki Hong Kim ,  Yongsik Yoon

IPC: G06F16/24 ,  G06F16/2453

Abstract: Methods and apparatus, including computer program products, are provided for a case join. In one aspect, there is provided method, which may include receiving a query for a predefined view that is configured to inhibit modification; detecting whether the predefined view includes a database table extended to include an additional column; and generating, in response to the query, a view based on a case join, when the predefined view includes the database table extended to include the additional column. Related apparatus, systems, methods, and articles are also described.

公开(公告)号：US10133778B2

公开(公告)日：2018-11-20

申请号：US14947252

申请日：2015-11-20

Applicant: SAP SE

Inventor： Taehyung Lee ,  Joo Young Yoon ,  Sang Il Song ,  Yongsik Yoon ,  Sung Heun Wi ,  Junhee Woo

IPC: G06F17/30

Abstract: Disclosed herein are system, method, and computer program product embodiments for utilizing join cardinality to improve the performance of query processing. An embodiment operates by a database engine receiving a query including a join operation on a first and a second table using a join predicate, and a tag for the join operation indicating a cardinality relationship between the first and the second table when satisfying the join predicate. Then, the database engine generates a query processing plan for performing the query. For the join operation, the database engine selects one of the first or the second tables to remove from the join operation based on a type of the join operation and the tag. Based on the selecting, the database engine may remove may the join operation and the selected table from the query processing plan.

公开(公告)号：US20170147645A1

公开(公告)日：2017-05-25

申请号：US14947927

申请日：2015-11-20

Applicant: SAP SE

Inventor： Sang Il Song ,  Junhee Woo ,  Taehyung Lee ,  Sung Heun Wi ,  Ki Hong Kim ,  Yongsik Yoon

IPC: G06F17/30

CPC classification number: G06F16/24544

Abstract: Methods and apparatus, including computer program products, are provided for a case join. In one aspect, there is provided method, which may include receiving a query for a predefined view that is configured to inhibit modification; detecting whether the predefined view includes a database table extended to include an additional column; and generating, in response to the query, a view based on a case join, when the predefined view includes the database table extended to include the additional column. Related apparatus, systems, methods, and articles are also described.

公开(公告)号：US20170147644A1

公开(公告)日：2017-05-25

申请号：US14947252

申请日：2015-11-20

Applicant: SAP SE

Inventor： Taehyung LEE ,  Joo Young Yoon ,  Sang Il Song ,  Yongsik Yoon ,  Sung Heun Wi ,  Junhee Woo

IPC: G06F17/30

CPC classification number: G06F17/30466 ,  G06F17/30

Abstract: Disclosed herein are system, method, and computer program product embodiments for utilizing join cardinality to improve the performance of query processing. An embodiment operates by a database engine receiving a query including a join operation on a first and a second table using a join predicate, and a tag for the join operation indicating a cardinality relationship between the first and the second table when satisfying the join predicate. Then, the database engine generates a query processing plan for performing the query. For the join operation, the database engine selects one of the first or the second tables to remove from the join operation based on a type of the join operation and the tag. Based on the selecting, the database engine may remove may the join operation and the selected table from the query processing plan.