fn governing_timeline(timeline: &TimelineContext) -> Option<Timeline>Expand description
The timeline whose oracle governs a read-then-write with the given read-side
TimelineContext.
The write target is always a table on EpochMilliseconds, so a read side
that pins no timeline (TimestampDependent) still maps to
EpochMilliseconds. None only for timestamp-independent selections, which
need no oracle at all.