公开(公告)号：US20170270162A1

公开(公告)日：2017-09-21

申请号：US15251167

申请日：2016-08-30

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Tae-Whi LEE ,  Sung-Soo KIM ,  Jong-Ho WON ,  Moon-Young CHUNG

IPC: G06F17/30

CPC classification number: G06F16/24545 ,  G06F16/2456 ,  G06F16/2471

Abstract: The following description relates to a query optimization method in distributed query engine and an apparatus thereof. A query optimization method according to an exemplary embodiment includes establishing a query plan based on query; classifying data to be included in result data of a high level operation from result data of a low level operation as a first data to be used for intermediate operations existing between the low level operation and the high level operation and a second data not to be used for the intermediate operations, based on the query plan; and modifying the query plan for the second data not to be an input value for the intermediate operations

公开(公告)号：US20240152503A1

公开(公告)日：2024-05-09

申请号：US18326673

申请日：2023-05-31

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Ji-Yong KIM ,  Mi-Young JANG ,  Jong-Ho WON

IPC: G06F16/23 ,  G06F16/22

CPC classification number: G06F16/2379 ,  G06F16/2246

Abstract: Disclosed herein are an apparatus and method for retrieving on-chain data based on an index. The apparatus includes memory in which at least one program is recorded and a processor for executing the program. The program may include a blockchain connection manager for recording data in at least one node or retrieving data from at least one node and outputting the same by being connected to a blockchain network formed of multiple nodes, a blockchain index manager for creating and managing an index for data stored in at least one node, and a query engine for requesting storage of data resulting from a transaction in a corresponding node through the blockchain connection manager, creating an index on the stored data by interworking with the blockchain index manager, and acquiring and outputting data that is retrieved based on the index through the blockchain connection manger in response to a retrieval request.