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https://issues.apache.org/jira/browse/ATLAS-145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14743407#comment-14743407
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Suma Shivaprasad edited comment on ATLAS-145 at 9/14/15 11:53 AM:
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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()
discoveryService.searchByGremlin(
{noformat}
"L:{_var_0 = [] as Set;g.V().has(\"__typeName\",
\"DB\").fill(_var_0);g.V().has(\"__superTypeNames\",
\"DB\").fill(_var_0);_var_0._().as(\"db1\").in(\"__Table.db\").back(\"db1\").and(_().has(\"DB.name\",
T.eq, \"Reporting\")).map.toList()}")
{noformat}
works
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()
Working query:
g.V().has("__typeName",
"DB").as("db1").in("__Table.db").back("db1").and(_().has("DB.name", T.eq,
"Reporting")).map.toList()
discoveryService.searchByGremlin("L:{_var_0 = [] as
Set;g.V().has(\"__typeName\",
\"DB\").fill(_var_0);g.V().has(\"__superTypeNames\",
\"DB\").fill(_var_0);_var_0._().as(\"db1\").in(\"__Table.db\").back(\"db1\").and(_().has(\"DB.name\",
T.eq, \"Reporting\")).map.toList()}") works
> 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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