Stephanie Hazlitt created ARROW-15731:
-----------------------------------------
Summary: Enable joins when data contains a list column
Key: ARROW-15731
URL: https://issues.apache.org/jira/browse/ARROW-15731
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Stephanie Hazlitt
Currently Arrow joins with data that contain a list column errors, even when
the list column is not a join key:
``` r
library(arrow)
#>
#> Attaching package: 'arrow'
#> The following object is masked from 'package:utils':
#>
#> timestamp
library(dplyr)
#>
#> Attaching package: 'dplyr'
#> The following objects are masked from 'package:stats':
#>
#> filter, lag
#> The following objects are masked from 'package:base':
#>
#> intersect, setdiff, setequal, union
jedi <- data.frame(name = c("C-3PO", "Luke Skywalker"),
jedi = c(FALSE, TRUE))
arrow_table(starwars) %>%
left_join(jedi) %>%
collect()
#> Error in `handle_csv_read_error()`:
#> ! Invalid: Data type list<item: string> is not supported in join non-key
field
```
The ability to join would be a useful enhancement for workflows with tabular
data where list columns can be common, and for geospatial workflows where
geometry columns are stored as `list` or `fixed_size_list` (thanks
[~paleolimbot] for mentioning that use case).
Related discussion here: https://issues.apache.org/jira/browse/ARROW-14519
--
This message was sent by Atlassian Jira
(v8.20.1#820001)
