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Posted to issues@arrow.apache.org by "Wes McKinney (JIRA)" <ji...@apache.org> on 2019/07/26 16:25:00 UTC
[jira] [Updated] (ARROW-6046) [C++] Slice RecordBatch of String
array with offset 0 returns whole batch
[ https://issues.apache.org/jira/browse/ARROW-6046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wes McKinney updated ARROW-6046:
--------------------------------
Summary: [C++] Slice RecordBatch of String array with offset 0 returns whole batch (was: Slice RecordBatch of String array with offset 0 returns whole batch)
> [C++] Slice RecordBatch of String array with offset 0 returns whole batch
> -------------------------------------------------------------------------
>
> Key: ARROW-6046
> URL: https://issues.apache.org/jira/browse/ARROW-6046
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, Python
> Affects Versions: 0.14.1
> Reporter: Sascha Hofmann
> Priority: Major
> Fix For: 1.0.0
>
>
> We are seeing a very similar bug as in ARROW-809, just for a RecordBatch of strings. A slice of a RecordBatch with a string column and offset =0 returns the whole batch instead.
>
> {code:java}
> import pandas as pd
> import pyarrow as pa
> df = pd.DataFrame({ 'b': ['test' for x in range(1000_000)]})
> tbl = pa.Table.from_pandas(df)
> batch = tbl.to_batches()[0]
> batch.slice(0,2).serialize().size
> # 4000232
> batch.slice(1,2).serialize().size
> # 240
> {code}
>
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