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https://issues.apache.org/jira/browse/ARROW-7266?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joris Van den Bossche updated ARROW-7266:
-----------------------------------------
Fix Version/s: 1.0.0
> [Python] dictionary_encode() of a slice gives wrong result
> ----------------------------------------------------------
>
> Key: ARROW-7266
> URL: https://issues.apache.org/jira/browse/ARROW-7266
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, Python
> Affects Versions: 0.15.1
> Environment: Docker on Linux 5.2.18-200.fc30.x86_64; Python 3.7.4
> Reporter: Adam Hooper
> Priority: Major
> Fix For: 1.0.0
>
>
> Steps to reproduce:
> {code:python}
> import pyarrow as pa
> arr = pa.array(["a", "b", "b", "b"])[1:]
> arr.dictionary_encode()
> {code}
> Expected results:
> {code}
> -- dictionary:
> [
> "b"
> ]
> -- indices:
> [
> 0,
> 0,
> 0
> ]
> {code}
> Actual results:
> {code}
> -- dictionary:
> [
> "b",
> ""
> ]
> -- indices:
> [
> 0,
> 0,
> 1
> ]
> {code}
> I don't know a workaround. Converting to pylist and back is too slow. Is
> there a way to copy the slice to a new offset-0 StringArray that I could then
> dictionary-encode? Otherwise, I'm considering building buffers by hand....
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