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https://issues.apache.org/jira/browse/TRAFODION-2317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15613714#comment-15613714
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ASF GitHub Bot commented on TRAFODION-2317:
-------------------------------------------
Github user sureshsubbiah commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/794#discussion_r85448965
--- Diff: core/sql/executor/ExHdfsScan.cpp ---
@@ -1700,6 +1714,138 @@ char *
ExHdfsScanTcb::extractAndTransformAsciiSourceToSqlRow(int &err,
return NULL;
}
+void ExHdfsScanTcb::computeRangesAtRuntime()
--- End diff --
I suppose this computation is being repeated by each esp. Is there a way by
which it can done once and shared (say computed during fixup)? If possible,
this would be a minor enhancement for later. I do see some comment indicating
that only portions relevant to this esp are computed. Maybe some comment
including a statement on which locality_balance_level this corresponds to will
help.
> 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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