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https://issues.apache.org/jira/browse/TRAFODION-2317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15623695#comment-15623695
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ASF GitHub Bot commented on TRAFODION-2317:
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Github user asfgit closed the pull request at:
https://github.com/apache/incubator-trafodion/pull/794
> Implement relational operator for common subexpressions and transformation
> --------------------------------------------------------------------------
>
> Key: TRAFODION-2317
> URL: https://issues.apache.org/jira/browse/TRAFODION-2317
> Project: Apache Trafodion
> Issue Type: Sub-task
> Components: sql-cmp
> Affects Versions: 2.1-incubating
> Reporter: Hans Zeller
> Assignee: Hans Zeller
>
> This subtask provides the infrastructure for handling common subexpressions:
> - A relational CommonSubExprRef operator to track the locations of common
> subexpressions in the query tree.
> - Methods to analyze the common subexpressions in the tree and to determine
> whether a transformation is possible and what the temporary table would look
> like.
> - Methods to do the actual query tree transformation.
> - Some needed changes in bookkeeping and runtime.
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