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https://issues.apache.org/jira/browse/ARROW-9969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou resolved ARROW-9969.
-----------------------------------
Fix Version/s: 2.0.0
Resolution: Fixed
Issue resolved by pull request 8178
[https://github.com/apache/arrow/pull/8178]
> [C++] RecordBatchBuilder yields invalid result with dictionary fields
> ---------------------------------------------------------------------
>
> Key: ARROW-9969
> URL: https://issues.apache.org/jira/browse/ARROW-9969
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Affects Versions: 1.0.1
> Reporter: Pierre Belzile
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.0.0
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> The record batch builder takes a schema as input and uses that schema when
> creating the record batch.
> However when one or more fields are dictionaries, the data type is unknown
> until the dictionary builder flushes and the initial schema often does not
> match. The builder needs to modify the schema for the actual data type
> generated.
> This problem is easily reproduced by providing a schema with a field
> dictionary(int16(), utf8()) and adding a single row. This yields a data type
> of dictionary(int8(),utf8()).
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