[ARROW-6046] [C++] Slice RecordBatch of String array with offset 0 returns whole batch

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.14.1
• Fix Version/s: 0.15.0
• Component/s: C++, Python
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/22449
• Assignee: Wes McKinney
• Reporter: Sascha Hofmann
• Created: 26/Jul/19 10:46
• Updated: 11/Jan/23 07:44
• Resolved: 20/Aug/19 13:24

Description

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.

 

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

 

Issue Links

• links to: GitHub Pull Request #5126