Merge

Merge is the 0246 pack's consolidation node: feed it several Highway pipes, Junction pipes, and plain lists, and it merges each kind into a single output - one HIGHWAY_PIPE, one JUNCTION_PIPE, and one batch list. The author's description is as terse as the node: "pipe and batch merging."

It's the natural companion to the pack's two pipe types. Highway and Junction are great at bundling data down a wire, but if you've got two sources of pipes and want them as one pipe for the next stage - or a stack of lists you want flattened into a single batch output - you either write a pile of connectors or you drop a Merge. It's not a node you build a workflow around; it's the node that keeps a workflow from growing a second head.

How it works

Merge walks every input. Each one lands in one of three buckets by its shape:

• Highway pipes (RevisionDict of kind highway) merge lane-by-lane. In flat mode, name collisions get suffixed with _pad (default "_") so nothing overwrites; in deep mode, same-type same-name lanes are concatenated into a list (RevisionBatch), which is the mode to reach for when you're genuinely combining batches.
• Junction pipes merge by appending values into a single typed queue, preserving the junction's index bookkeeping.
• Plain lists (or anything not a pipe) get appended to the _batch_out list - deep mode flattens nested lists one level, flat keeps them nested.

The inputs and outputs

• _mode - flat (append, pad collisions) or deep (recursively merge same-typed lanes).
• _pad - the collision suffix, default "_".
• _way_out - the merged HIGHWAY_PIPE.
• _junc_out - the merged JUNCTION_PIPE.
• _batch_out - the merged batch as a list.

You don't have to use all three outputs - merge just the pipes, or just the batches. Whatever you didn't feed comes out as a None/empty.

How to install it

The usual:

cd ComfyUI/custom_nodes
git clone https://github.com/Trung0246/ComfyUI-0246

restart, or ComfyUI Manager → search "ComfyUI-0246". No models.

Common issues & troubleshooting

A lane is missing or renamed. In flat mode, a name collision got _pad appended (data becomes data_). Either switch to deep (if the collision is genuinely same-type data you want combined) or check that your source lanes have distinct names.

Lists are nested when you expected flat (or vice versa). flat keeps sublists intact; deep flattens one level. If your _batch_out looks off, the mode is the first suspect.

An output is None when you expected data. You didn't feed that pipe kind - Merge only fills the outputs whose input kind actually appeared. Wire a Highway pipe in if you want _way_out to carry something.