[jira] [Work started] (TRAFODION-2317) Implement relational operator for common subexpressions and transformation

["Hans Zeller (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TRAFODION-2317?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on TRAFODION-2317 started by Hans Zeller.
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> 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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