[8.x] ESQL: Rework isNull (#118101)
#118178
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This reworks `Expressions#isNull` so it only matches the `null` literal. This doesn't super change the way ESQL works because we already rewrite things that `fold` into `null` into the `null` literal. It's just that, now, `isNull` won't return `true` for things that *fold* to null - only things that have *already* folded to null. This is important because `fold` can be quite expensive so we're better off keeping the results of it when possible. Which is what the constant folding rules *do*.
nik9000
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:Analytics/Compute Engine
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Backports the following commits to 8.x:
isNull(ESQL: ReworkisNull#118101)