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The from operator cannot have a parent in the flowgraph. Its semantics are to scan its source exactly once. For files only, change it to allow it to have a parent from which it consumes values, scanning its files once per value. A similar change for non-file sources will follow.
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The from operator cannot have a parent in the flowgraph. Its semantics are to scan its source exactly once. For files only, change it to allow it to have a parent from which it consumes values, scanning its files once per value.
A similar change for non-file sources will follow.
Fixes #7259.