Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/13876
Ah, in order to optimize once, `list.forall(_.deterministic)` seems not
sufficient.
It passes many normal cases again and again. For `OptimizeIn` optimizer
case, we need `SQLConf`, too.
Actually, it seems that we need a **var** flag like a transition from `In`
to `InSet` instead of **lazy val**
In other words, for `Optimize-Once` semantics,
- First, we should give a change to enter optimizations if it's optimizable.
So, the flag should be **initialized by each optimizer** as a `true` with
some proper own conditions.
- After optimization, the optimizers should **turn off the flag** to
prevent further computation.
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