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https://issues.apache.org/jira/browse/SOLR-4799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13652088#comment-13652088
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Mikhail Khludnev commented on SOLR-4799:
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Ok. James, I've got your point. Let me collect code and tests for submitting.
> 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
>
> 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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