[jira] [Created] (FLINK-4068) Move constant computations out of code-generated `flatMap` functions.

[Shang Yuanchun (Jira)]

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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