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From "Fabian Hueske (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-3850) Add forward field annotations to DataSet operators generated by the Table API
Date Thu, 28 Apr 2016 16:09:13 GMT
Fabian Hueske created FLINK-3850:
------------------------------------

             Summary: Add forward field annotations to DataSet operators generated by the
Table API
                 Key: FLINK-3850
                 URL: https://issues.apache.org/jira/browse/FLINK-3850
             Project: Flink
          Issue Type: Improvement
          Components: Table API
            Reporter: Fabian Hueske


The DataSet API features semantic annotations [1] to hint the optimizer which input fields
an operator copies. This information is valuable for the optimizer because it can infer that
certain physical properties such as partitioning or sorting are not destroyed by user functions
and thus generate more efficient execution plans.

The Table API is built on top of the DataSet API and generates DataSet programs and code for
user-defined functions. Hence, it knows exactly which fields are modified and which not. We
should use this information to automatically generate forward field annotations and attach
them to the operators. This can help to significantly improve the performance of certain jobs.

[1] https://ci.apache.org/projects/flink/flink-docs-release-1.0/apis/batch/index.html#semantic-annotations



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