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From "Noble Paul (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-4799) SQLEntityProcessor for zipper join
Date Tue, 02 Dec 2014 15:19:13 GMT

    [ https://issues.apache.org/jira/browse/SOLR-4799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14231599#comment-14231599
] 

Noble Paul commented on SOLR-4799:
----------------------------------

Isn't only relevant for {{SqlEntityProcessor}} ? can zipper be initialized at {{SqlEntityProcessor}}
instead of {{EntityProcessorBase}} ?

> SQLEntityProcessor for zipper join
> ----------------------------------
>
>                 Key: SOLR-4799
>                 URL: https://issues.apache.org/jira/browse/SOLR-4799
>             Project: Solr
>          Issue Type: New Feature
>          Components: contrib - DataImportHandler
>            Reporter: Mikhail Khludnev
>            Priority: Minor
>              Labels: DIH, dataimportHandler, dih
>         Attachments: SOLR-4799.patch, SOLR-4799.patch, SOLR-4799.patch, SOLR-4799.patch,
SOLR-4799.patch
>
>
> DIH is mostly considered as a playground tool, and real usages end up with SolrJ. I want
to contribute few improvements target DIH performance.
> This one provides performant approach for joining SQL Entities with miserable memory
at contrast to http://wiki.apache.org/solr/DataImportHandler#CachedSqlEntityProcessor  
> The idea is:
> * parent table is explicitly ordered by it’s PK in SQL
> * children table is explicitly ordered by parent_id FK in SQL
> * children entity processor joins ordered resultsets by ‘zipper’ algorithm.
> Do you think it’s worth to contribute it into DIH?
> cc: [~goksron] [~jdyer]



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