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From "Taewoo Kim (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ASTERIXDB-1556) Hash Table used by External hash group-by doesn't conform to the budget.
Date Sat, 06 Aug 2016 06:36:20 GMT

     [ https://issues.apache.org/jira/browse/ASTERIXDB-1556?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Taewoo Kim updated ASTERIXDB-1556:
----------------------------------
    Summary: Hash Table used by External hash group-by doesn't conform to the budget.  (was:
Prefix-based multi-way Fuzzy-join generates an exception.)

> Hash Table used by External hash group-by doesn't conform to the budget.
> ------------------------------------------------------------------------
>
>                 Key: ASTERIXDB-1556
>                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-1556
>             Project: Apache AsterixDB
>          Issue Type: Bug
>            Reporter: Taewoo Kim
>            Assignee: Taewoo Kim
>         Attachments: 2wayjoin.pdf, 2wayjoin.rtf, 2wayjoinplan.rtf, 3wayjoin.pdf, 3wayjoin.rtf,
3wayjoinplan.rtf
>
>
> When we enable prefix-based fuzzy-join and apply the multi-way fuzzy-join ( > 2),
the system generates an out-of-memory exception. 
> Since a fuzzy-join is created using 30-40 lines of AQL codes and this AQL is translated
into massive number of operators (more than 200 operators in the plan for a 3-way fuzzy join),
it could generate out-of-memory exception.



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