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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