Reuven Lax created BEAM-6858:
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Summary: Support side inputs injected into a DoFn
Key: BEAM-6858
URL: https://issues.apache.org/jira/browse/BEAM-6858
Project: Beam
Issue Type: Bug
Components: sdk-java-core
Reporter: Reuven Lax
Beam currently supports injecting main inputs into a DoFn process method. A
user can write the following:
@ProcessElement public void process(@Element InputT element)
And Beam will (using ByteBuddy code generation) inject the input element into
the process method.
We would like to also support the same for side inputs. For example:
@ProcessElement public void process(@Element InputT element, @SideInput("tag1")
String input1, @SideInput("tag2") Integer input2)
This requires the existing process-method analysis framework to capture these
side inputs. The ParDo code would have to verify the type of the side input and
include them in the list of side inputs. This would also eliminate the need for
the user to explicitly call withSideInputs on the ParDo.
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