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Posted to issues@trafodion.apache.org by "Hans Zeller (JIRA)" <ji...@apache.org> on 2016/10/31 23:09:58 UTC
[jira] [Resolved] (TRAFODION-2317) Implement relational operator
for common subexpressions and transformation
[ https://issues.apache.org/jira/browse/TRAFODION-2317?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hans Zeller resolved TRAFODION-2317.
------------------------------------
Resolution: Implemented
Fix Version/s: 2.2-incubating
Code committed on 10/31/2016 with 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
> Fix For: 2.2-incubating
>
>
> 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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