nealrichardson commented on a change in pull request #41:
URL: https://github.com/apache/arrow-cookbook/pull/41#discussion_r692182956
##########
File path: r/content/reading_and_writing_data.Rmd
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@@ -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:
Ah, I know what it is: `parquet_tbl` is already a `tbl_df` so
`dplyr::collect()` literally does nothing, and `as.data.frame.tbl_df` removes
the attributes. So it's not that we should do as.data.frame() instead of
collect(), we should do neither (and consider renaming the variable if `_tbl`
is ambiguous).
```suggestion
expect_identical(parquet_tbl, tibble::tibble(group = c("A", "B", "C"),
score = c(99, 97, 99)))
```
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