====== Lookup Table Junction ======

===== Description =====

Picks the first available lookup table from two possible execution pipelines, so a lookup table still reaches the rest of the model even when one of the pipelines that could produce it does not run.

===== Inputs =====

^ Name  ^ Type  ^ Description  ^
| Possible Table 1  | [[Lookup Table Type]]  | Lookup table produced by one possible execution pipeline.  |
| Possible Table 2  | [[Lookup Table Type]]  | Lookup table produced by another possible execution pipeline.  |

===== Optional Inputs =====

None.

===== Outputs =====

^ Name  ^ Type  ^ Description  ^
| Table  | [[Lookup Table Type]]  | Lookup table picked.  |

===== Group =====

[[Functor List#Control | Control]]

===== Notes =====

The inputs are checked in order — Possible Table 1, then Possible Table 2 — and the first one that has a value is passed to the output. If neither input has a value, the output is left without one, which allows chaining several junctions together to combine more than two possible pipelines.

This functor is typically placed after a container whose execution is conditional, such as [[If Then]] or [[Skip On Error]], so a default lookup table is still available when that container's content does not run or does not finish.

This functor was previously known as "JoinLookupTable"; that name is still accepted for backward compatibility with existing scripts.

===== Internal Name =====

LookupTableJunction