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Update vignette section on scanning partitions #458

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merged 2 commits into from
Nov 2, 2023
Merged

Update vignette section on scanning partitions #458

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184e731
update vignette section on partitioning
etiennebacher Nov 2, 2023
18771c8
Merge branch 'main' into update-vignette-partition
etiennebacher Nov 2, 2023
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10 changes: 3 additions & 7 deletions vignettes/polars.Rmd
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Original file line number Diff line number Diff line change
Expand Up @@ -467,11 +467,8 @@ aq$filter(
)$collect()
```

Finally, can read/scan multiple files in the same directory through pattern
globbing. However, please note that partition-aware scanning is not yet
supported out of the box (e.g., Hive-style partitioned datasets). Follow
[this issue](https://github.com/pola-rs/polars/issues/4347) for more details
about when this will be resolved.
Finally, we can read/scan multiple files in the same directory through pattern
globbing.

```{r}
dir.create("airquality-ds")
Expand All @@ -480,8 +477,7 @@ write_dataset(airquality, "airquality-ds", partitioning = "Month")
# Use pattern globbing to scan all parquet files in the folder
aq2 = pl$scan_parquet("airquality-ds/*/*.parquet")
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Suggested change
aq2 = pl$scan_parquet("airquality-ds/*/*.parquet")
aq2 = pl$scan_parquet("airquality-ds/**/*.parquet")

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Ah too late 😄


# Just print the first two rows. But note that the Month column
# (which we used for partitioning) is missing.
# Just print the first two rows.
aq2$limit(2)$collect()
```

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