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Posted to jira@arrow.apache.org by "Dewey Dunnington (Jira)" <ji...@apache.org> on 2022/10/07 19:21:00 UTC
[jira] [Resolved] (ARROW-17738) [R] dplyr::compute should convert from grouped arrow_dplyr_query to arrow Table
[ https://issues.apache.org/jira/browse/ARROW-17738?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dewey Dunnington resolved ARROW-17738.
--------------------------------------
Fix Version/s: 10.0.0
Resolution: Fixed
Issue resolved by pull request 14160
[https://github.com/apache/arrow/pull/14160]
> [R] dplyr::compute should convert from grouped arrow_dplyr_query to arrow Table
> -------------------------------------------------------------------------------
>
> Key: ARROW-17738
> URL: https://issues.apache.org/jira/browse/ARROW-17738
> Project: Apache Arrow
> Issue Type: Bug
> Components: R
> Affects Versions: 9.0.0
> Reporter: SHIMA Tatsuya
> Assignee: SHIMA Tatsuya
> Priority: Major
> Labels: pull-request-available
> Fix For: 10.0.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> It is expected that {{dplyr::compute()}} will perform the calculation on the arrow dplyr query and convert it to a Table, but it does not seem to work correctly for grouped arrow dplyr queries and does not result in a Table.
> {code:r}
> mtcars |> arrow::arrow_table() |> dplyr::group_by(cyl) |> dplyr::compute() |> class()
> #> [1] "arrow_dplyr_query"
> mtcars |> arrow::arrow_table() |> dplyr::group_by(cyl) |> dplyr::ungroup() |> dplyr::compute() |> class()
> #> [1] "Table" "ArrowTabular" "ArrowObject" "R6"
> {code}
> {{as_arrow_table()}} works fine.
> {code:r}
> mtcars |> arrow::arrow_table() |> dplyr::group_by(cyl) |> class()
> #> [1] "arrow_dplyr_query"
> mtcars |> arrow::arrow_table() |> dplyr::group_by(cyl) |> dplyr::compute() |> class()
> #> [1] "arrow_dplyr_query"
> mtcars |> arrow::arrow_table() |> dplyr::group_by(cyl) |> dplyr::collect(FALSE) |> class()
> #> [1] "arrow_dplyr_query"
> mtcars |> arrow::arrow_table() |> dplyr::group_by(cyl) |> arrow::as_arrow_table() |> class()
> #> [1] "Table" "ArrowTabular" "ArrowObject" "R6"
> {code}
> It seems to revert to arrow dplyr query in the following line.
> [https://github.com/apache/arrow/blob/7cfdfbb0d5472f8f8893398b51042a3ca1dd0adf/r/R/dplyr-collect.R#L73-L75]
>
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