Dominic Dennenmoser created ARROW-8779:
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Summary: [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: 0.17.0, 0.16.0
Reporter: Dominic Dennenmoser
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}
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