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1. (WO2017037773) QUERY DEVELOPMENT ASSISTANCE METHOD AND QUERY DEVELOPMENT ASSISTANCE DEVICE

Pub. No.:    WO/2017/037773    International Application No.:    PCT/JP2015/074372
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sat Aug 29 01:59:59 CEST 2015
IPC: G06F 17/30
Applicants: HITACHI, LTD.
株式会社日立製作所
Inventors: KATSUNUMA, Satoshi
勝沼 聡
IMAKI, Tsuneyuki
今木 常之
Title: QUERY DEVELOPMENT ASSISTANCE METHOD AND QUERY DEVELOPMENT ASSISTANCE DEVICE
Abstract:
According to the present invention, a computer: receives both characteristic information about an input stream, and a template call query that includes one or more templates describing predetermined processing for a stream data process; generates stream data processing queries from the template call query; generates an operator tree from each stream data processing query; calculates inter-operator time characteristics from each operator tree, which is generated from a respective stream data processing query, said calculated inter-operator time characteristics being set as query time characteristics of the stream data processing query; calculates time characteristics of the template process performed for each template, on the basis of the query time characteristics of each stream data processing query generated for the template and on the basis of the characteristic information about the input stream; and determines whether the calculated time characteristics of each template process satisfy a constraint condition preset for the template.