Fabian Hueske created FLINK-4068:
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Summary: 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
Affects Versions: 1.1.0
Reporter: Fabian Hueske
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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