Fabian Hueske created FLINK-3850:
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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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