explicate Gather operations in workflow dependencies #189
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…nditional sections are referenced outside
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When a value or call output inside a workflow scatter or conditional section is referenced by some identifier expression outside of that section, there's an implied operation to gather the array of values/outputs (or conditional value). We add a little
GatherAST node which may sit inWDL.Expr.Ident.refereeto represent this operation abstractly, which will be useful in scheduling workflow execution.