GitHub user fbourgine-cpu added a comment to the discussion: Pipeline Executor 
return no rows

Hi
Thank you for your reply

I tried but get an issue (JSON..)

Error registering execution information
sub_pipeline1.hpl.0 - Null key for a Map not allowed in JSON (use a
converting NullKeySerializer?) (through reference chain:
org.apache.hop.execution.Execution["parameterValues"])

Le ven. 7 nov. 2025 à 10:08, dave-csc ***@***.***> a écrit :

> If I get correctly, you need to get the output of two distinct pipelines
> and merge them somehow in a parent pipeline.
>
> Then you can call each one with a Pipeline Executor, but as mentioned
> above you need to trigger them with a single row: use a Generate row
> transform, configure it to create a single row and no schema. Link this
> transform to (all) the subsequent Pipeline Executor(s), this is enough to
> trigger it/them (remember to "copy" the row and not to "distribute" it)
>
> Finally, link the Pipeline Executor output(s) to the merging transform
>
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GitHub link: 
https://github.com/apache/hop/discussions/5965#discussioncomment-14901141

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