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https://issues.apache.org/jira/browse/FLINK-4068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Timo Walther resolved FLINK-4068.
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Resolution: Fixed
Fix Version/s: 1.2.0
Fixed in a71133945e66ec471b4cb07da0693d545c40923c and
f00e1e7c5578caf52eaffc5cbdd102589c13f52d.
> Move constant computations out of code-generated `flatMap` functions.
> ---------------------------------------------------------------------
>
> Key: FLINK-4068
> URL: https://issues.apache.org/jira/browse/FLINK-4068
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Affects Versions: 1.1.0
> Reporter: Fabian Hueske
> Assignee: Jark Wu
> Fix For: 1.2.0
>
>
> The generated functions for expressions of the Table API or SQL include
> constant computations.
> For instance the code generated for a predicate like:
> {code}
> myInt < (10 + 20)
> {code}
> looks roughly like:
> {code}
> public void flatMap(Row in, Collector<Row> out) {
> Integer in1 = in.productElement(1);
> int temp = 10 + 20;
> if (in1 < temp) {
> out.collect(in)
> }
> }
> {code}
> In this example the computation of {{temp}} is constant and could be moved
> out of the {{flatMap()}} method.
> The same might apply for generated function other than {{FlatMap}} as well.
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