[ARROW-809] C++: Writing sliced record batch to IPC writes the entire array

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.3.0
• Component/s: C++
• Assignee: Wes McKinney
• Reporter: Itai Incze
• Created: 12/Apr/17 10:37
• Updated: 19/Apr/17 01:12
• Resolved: 19/Apr/17 01:12

Description

The bug can be triggered through python:

import pyarrow.parquet
array = pyarrow.array.from_pylist([1] * 1000000)

rb = pyarrow.RecordBatch.from_arrays([array], ['a'])
rb2 = rb.slice(0,2)

with open('/tmp/t.arrow', 'wb') as f:
  w = pyarrow.ipc.FileWriter(f, rb.schema)
  w.write_batch(rb2)
  w.close()

which will result in a big file:

$ ll /tmp/t.arrow 
-rw-rw-r-- 1 itai itai 800618 Apr 12 13:22 /tmp/t.arrow

Issue Links

• blocks: ARROW-670 Arrow 0.3 release