[PR] Spark Runner : Fix invalid translateImpulse [beam]

Wed, 12 Mar 2025 20:52:22 -0700 


twosom opened a new pull request, #34272:
URL: https://github.com/apache/beam/pull/34272

   **Please** add a meaningful description for your change here
   
   fixes #20426 
   
   This PR addresses an issue in the `translateImpulse` method of the 
`SparkStreamingPortablePipelineTranslator`, which was introduced in the changes 
made under #34080.
   
   The root cause of the test failures was the use of `ConstantInputDStream` 
instead of `SingleEmitInputDStream`. This incorrect implementation led to the 
impulse being emitted multiple times, causing unexpected behavior.
   
   By replacing `ConstantInputDStream` with `SingleEmitInputDStream`, this 
issue has been resolved.
   
   related PR : #34253
   
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