Merge source - tabbed source preview
Not planned
Currently the merge source pipe preview will only show the merged entity in the source part of the preview. The actual input entities are not shown in the pipe preview, which would be useful and consistent with other pipe types.
One way of solving this, at least visually, could be to have tabs in the source part of the preview - one tab for each source dataset.
Dataset _ids are sometimes quite verbose so using the mandatory aliases as tab names would probably save a lot of UI real estate.
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Official comment
There is a trick that you can use to see the source entities. If you set the merge source's "strategy" property to "list" then the list of merged source entities does show up in the "$merged" property. The pipe should be disabled before you change that property as it'll affect the pipe's output as well.
We'll consider adding more explicit support for this.Comment actions
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