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https://issues.apache.org/jira/browse/ARROW-8779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17105742#comment-17105742
]
Dominic Dennenmoser commented on ARROW-8779:
--------------------------------------------
This minimal repex should result in the mentioned error message:
{code:r}
nrows <- 1:3
df <-
tibble::tibble(
id = 1L,
data =
list(
tibble::tibble(
a = letters[nrows],
b = as.integer(nrows),
c = as.factor(a),
d = b/2
)
)
)
arrow::write_parquet(df, "test.parquet")
{code}
> [R] Unable to write Struct Layout to file (.arrow, .parquet)
> ------------------------------------------------------------
>
> Key: ARROW-8779
> URL: https://issues.apache.org/jira/browse/ARROW-8779
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Affects Versions: 0.16.0, 0.17.0
> Reporter: Dominic Dennenmoser
> Priority: Major
> Labels: features, patch
>
> It seems there is no method implemented to write a StructArrow (within a
> TableArrow) to file. A common case would be list columns in a dataframe. If I
> have understood the documentation correctly, the should be realisable within
> the current C++ library framework.
> I tested this with the follow df structure:
> {code:none}
> df
> |-- id <column: string>
> |-- data <column: list>
> | |-- a <column: string>
> | |-- b <column: integer>
> | |-- c <column: factor>
> | |-- d <column: double>{code}
> I got the follow error message:
> {code:none}
> Error in Table__from_dots(dots, schema) : NotImplemented: Converting vector
> to arrow type struct<a: string, b: int32, c: dictionary<values=string,
> indices=int8, ordered=0>, d: double> not implemented{code}
> I have tried it with {{arrow}} 0.17.0 under {{R}} 3.6.1 .
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