[jira] [Commented] (SOLR-4799) SQLEntityProcessor for zipper join

["Mikhail Khludnev (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-4799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14222042#comment-14222042 ] 

Mikhail Khludnev commented on SOLR-4799:
----------------------------------------

Note regarding the patch. It introduces join="zipper" attribute for any entity processor, which is used as child, for sure both entities should be ordered by the same ID: 
{code}
<dataConfig>
	<document>
		<entity name="parent" processor="SqlEntityProcessor" query="SELECT * FROM PARENT ORDER BY id">		
			<entity name="child_1" processor="SqlEntityProcessor"
				where="parent_id=parent.id" query="SELECT * FROM CHILD_1 ORDER BY parent_id" join="zipper" >
			</entity>			
		</entity>
	</document>
</dataConfig>
{code} 
Let me know if you wish to see it like separate class OrderedChildrenEntityProcessor see above. cc [~noble.paul]

> 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
>
>
> 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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