Ian Cook created ARROW-12763:
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Summary: [R] Optimize dplyr queries that use head/tail after
arrange
Key: ARROW-12763
URL: https://issues.apache.org/jira/browse/ARROW-12763
Project: Apache Arrow
Issue Type: Improvement
Components: R
Reporter: Ian Cook
Use the Arrow C++ function {{partition_nth_indices}} to optimize dplyr queries
like this:
{code:r}
iris %>%
Table$create() %>%
arrange(desc(Sepal.Length)) %>%
head(10) %>%
collect()
{code}
This query sorts the full table even though it doesn't need to. It could use
{{partition_nth_indices}} to find the rows containing the top 10 values of
{{Sepal.Length}} and only collect and sort those 10 rows.
Test to see if this improves performance in practice on larger data.
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