Rajat Khandelwal created LENS-1471:
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Summary: JoinCandidate's children should not share same storage
candidate
Key: LENS-1471
URL: https://issues.apache.org/jira/browse/LENS-1471
Project: Apache Lens
Issue Type: Bug
Components: cube
Reporter: Rajat Khandelwal
Assignee: Rajat Khandelwal
The issue is in Join candidates of the kind {{Join\[Union\[a,b\];
Union\[a,c\]\]}}. If the instance of {{a}} is shared in different trees of a
JoinCandidate, the rewritten query will be wrong. JoinCandidate's children set
exclusive measure phrase indices, and that is done via truncate method of list.
So let's say union1 is answering {{\[0,1\]}} measures and union2 is answering
{{\[2,3\]}} measures, and since {{\[0,1,2,3\].retain(\[0,1\]).retain(\[2,3\])
== \[\]}}, it ends up answering no measures at all
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