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https://issues.apache.org/jira/browse/ARROW-6872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney updated ARROW-6872:
--------------------------------
Fix Version/s: 1.0.0
> [C++][Python] Empty table with dictionary-columns raises
> ArrowNotImplementedError
> ---------------------------------------------------------------------------------
>
> Key: ARROW-6872
> URL: https://issues.apache.org/jira/browse/ARROW-6872
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, Python
> Affects Versions: 0.15.0
> Reporter: Marco Neumann
> Priority: Minor
> Fix For: 1.0.0
>
>
> h2. Abstract
> As a pyarrow user, I would expect that I can create an empty table out of
> every schema that I created via pandas. This does not work for dictionary
> types (e.g. {{"category"}} dtypes).
> h2. Test Case
> This code:
> {code:python}
> import pandas as pd
> import pyarrow as pa
> df = pd.DataFrame({"x": pd.Series(["x", "y"], dtype="category")})
> table = pa.Table.from_pandas(df)
> schema = table.schema
> table_empty = schema.empty_table() # boom
> {code}
> produces this exception:
> {noformat}
> Traceback (most recent call last):
> File "arrow_bug.py", line 8, in <module>
> table_empty = schema.empty_table()
> File "pyarrow/types.pxi", line 860, in __iter__
> File "pyarrow/array.pxi", line 211, in pyarrow.lib.array
> File "pyarrow/array.pxi", line 36, in pyarrow.lib._sequence_to_array
> File "pyarrow/error.pxi", line 86, in pyarrow.lib.check_status
> pyarrow.lib.ArrowNotImplementedError: Sequence converter for type
> dictionary<values=string, indices=int8, ordered=0> not implemented
> {noformat}
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