nealrichardson commented on issue #34437:
URL: https://github.com/apache/arrow/issues/34437#issuecomment-1481235488
I checked again with the current state of my branch and 4 tests fail if I
use the FetchNode, 3 of which are on Datasets. The other one is a query on a
table, but fetch comes after aggregation:
```
library(arrow)
library(dplyr)
mtcars %>%
arrow_table() %>%
summarize(mean(hp)) %>%
head() %>%
collect()
# Error in `compute.arrow_dplyr_query()`:
# ! Invalid: Fetch node's input has no meaningful ordering and so
limit/offset will be non-deterministic. Please establish order in some way
(e.g. by inserting an order_by node)
```
I guess that's reasonable that it should error (or at least warn)?
Seems like I should wait for https://github.com/apache/arrow/issues/34698 to
happen so that I'm not having to special-case datasets temporarily.
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