jonkeane commented on pull request #9615:
URL: https://github.com/apache/arrow/pull/9615#issuecomment-841305558
And, just to be sure that we're not doing anything funky, I even did a
roundtrip + compared the outputs and all seems to be good:
```
> library(arrow)
> fannie_df <-
read_parquet("~/repos/ab_store/data/fanniemae_2016Q4.parquet.snappy")
> system.time(tab <- Table$create(fannie_df))
user system elapsed
7.387 0.514 2.754
> tab_df <- as.data.frame(tab)
> waldo::compare(fannie_df, tab_df)
✔ No differences
```
And with no threads:
```
> options("arrow.use_threads" = FALSE)
> system.time(tab <- Table$create(fannie_df))
user system elapsed
6.034 0.367 6.419
> tab_df <- as.data.frame(tab)
> waldo::compare(fannie_df, tab_df)
✔ No differences
>
```
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