dragosmg commented on PR #13070:
URL: https://github.com/apache/arrow/pull/13070#issuecomment-1125242801
@jonkeane in terms of what have I tried, I went down this route to identify
the fist non-NULL element of `x`.
```r
for (i in 1:x$length()) {
if (x$IsValid(i -1)) {
xx <- x$Slice(i - 1 , 1)
break()
}
}
```
which doesn't work when `x` is an `Expression`, but it does the it is an
`Array`. If only there were a way to anticipatively get the length of an
`Expression` output (and other info) once evaluated.
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