nealrichardson commented on a change in pull request #41:
URL: https://github.com/apache/arrow-cookbook/pull/41#discussion_r692179176
##########
File path: r/content/reading_and_writing_data.Rmd
##########
@@ -60,11 +60,11 @@ Given a Parquet file, it can be read back in by using
`arrow::read_parquet()`.
```{r, read_parquet}
parquet_tbl <- read_parquet("my_table.parquet")
-head(parquet_tbl)
+parquet_tbl
```
```{r, test_read_parquet, opts.label = "test"}
test_that("read_parquet works as expected", {
- expect_equivalent(dplyr::collect(parquet_tbl), tibble::tibble(group = c("A",
"B", "C"), score = c(99, 97, 99)))
+ expect_identical(as.data.frame(parquet_tbl), tibble::tibble(group = c("A",
"B", "C"), score = c(99, 97, 99)))
Review comment:
That's not what I see locally:
```
> my_table <- Table$create(tibble::tibble(group = c("A", "B", "C"), score =
c(99, 97, 99)))
> write_parquet(my_table, "my_table.parquet")
> attributes(read_parquet("my_table.parquet"))
$names
[1] "group" "score"
$class
[1] "tbl_df" "tbl" "data.frame"
$row.names
[1] 1 2 3
> attributes(tibble::tibble(group = c("A", "B", "C"), score = c(99, 97, 99)))
$names
[1] "group" "score"
$row.names
[1] 1 2 3
$class
[1] "tbl_df" "tbl" "data.frame"
```
I see that the attributes are in a different order, which while not
functionally relevant, could mean that they don't test equally. We just got a
JIRA about this this week, in fact.
Note that `collect` just wraps `as.data.frame()`:
https://github.com/apache/arrow/blob/master/r/R/dplyr-collect.R#L43-L49
Side note: if the cookbook tests were to use testthat 3rd edition, we'd get
better diffs of what attributes don't match.
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