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From "Suma Shivaprasad (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (ATLAS-145) DSL - Fix back reference DSL to gremlin translation issues
Date Mon, 14 Sep 2015 11:50:45 GMT

    [ https://issues.apache.org/jira/browse/ATLAS-145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14743407#comment-14743407
] 

Suma Shivaprasad edited comment on ATLAS-145 at 9/14/15 11:50 AM:
------------------------------------------------------------------

We need to change the DSL to gremlin  translation here to 

g.V.has("typeName","DB").as("db").in("Table.db").back("db").and(_()has("name", T.eq, "Reporting")).map().toList()


Working query: 
g.V().has("__typeName", "DB").as("db1").in("__Table.db").back("db1").and(_().has("DB.name",
T.eq, "Reporting")).map.toList()




was (Author: suma.shivaprasad):
We need to change the DSL to gremlin  translation here to 

g.V.has("typeName","DB").as("db").in("Table.db").back("db").and(_()has("name", T.eq, "Reporting")).map().toList()




> DSL - Fix back reference DSL to gremlin translation issues
> ----------------------------------------------------------
>
>                 Key: ATLAS-145
>                 URL: https://issues.apache.org/jira/browse/ATLAS-145
>             Project: Atlas
>          Issue Type: Bug
>            Reporter: Suma Shivaprasad
>
> GremlinQuery.scala
> /*
>      * TODO
>      * Translation Issues:
>      * 1. back references in filters. For e.g. testBackreference: 'DB as db Table where
(db.name = "Reporting")'
>      *    this is translated to:
>      * g.V.has("typeName","DB").as("db").in("Table.db").and(_().back("db").has("name",
T.eq, "Reporting")).map().toList()
>      * But the '_().back("db") within the and is ignored, the has condition is applied
on the current element.
>      * The solution is to to do predicate pushdown and apply the filter immediately on
top of the referred Expression.
>      */



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