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Posted to issues@trafodion.apache.org by "Hans Zeller (JIRA)" <ji...@apache.org> on 2016/10/27 01:58:58 UTC

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

Hans Zeller created TRAFODION-2317:
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             Summary: 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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