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https://issues.apache.org/jira/browse/LENS-122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14259851#comment-14259851
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Jaideep Dhok commented on LENS-122:
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I am noting sub-tasks for this feature.
# Change rewriting to support multiple expressions - Changes needed in
expression resolver, Candidate fact/dim resolvers and aggregate resolver
# Cube metastore client changes - Support creating expression columns with
multiple expressions
# Lens-Server changes - REST Api changes, related client changes and megastore
service changes. I think changes are also required in the cube XSD.
> Add multiple expressions to expression column
> ----------------------------------------------
>
> Key: LENS-122
> URL: https://issues.apache.org/jira/browse/LENS-122
> Project: Apache Lens
> Issue Type: Improvement
> Components: cube
> Reporter: Amareshwari Sriramadasu
> Assignee: Jaideep Dhok
> Fix For: 2.0
>
>
> There can be multiple expressions for an expression column and then
> expression resolver should replace them lazily.
> This was required to solve two usecases:
> # Allowing some fact tables to have expressions directly materialized
> # Having two different expressions in different facts for same expression
> column
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