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https://issues.apache.org/jira/browse/ARROW-12676?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kyle Kavanagh updated ARROW-12676:
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Issue Type: Bug (was: New Feature)
> RecordBatchBuilder with uint dictionary creates signed int Batch
> ----------------------------------------------------------------
>
> Key: ARROW-12676
> URL: https://issues.apache.org/jira/browse/ARROW-12676
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Affects Versions: 3.0.0
> Reporter: Kyle Kavanagh
> Priority: Major
>
> When a RecordBatchBuilder with a dictionary type w/ a uint32 index is flushed
> to a batch, the resulting batch contains a int32 index:
> {code:java}
> BatchBuilder schema after flush:
> Symbol: dictionary<values=string, indices=int16, ordered=0>
> Status: dictionary<values=string, indices=uint32, ordered=0>{code}
> {code:java}
> Batch schema after flush:
> Symbol: dictionary<values=string, indices=int16, ordered=0>
> Status: dictionary<values=string, indices=int32, ordered=0>
> {code}
> from:
> {code:java}
> std::shared_ptr<arrow::RecordBatch> batch;
> auto status = batchBuilder_>Flush(&batch);
> std::cout<<"BatchBuilder schema after flush:
> "<<batchBuilder_->schema()->ToString()<<std::endl;
> std::cout<<"Batch schema after flush:
> "<<batch->schema()->ToString()<<std::endl;
> if(!status.ok()) { throw Exception("Arrow batch flush failed: {}",
> status); }{code}
> This results in a failure to write: "Invalid: Tried to write record batch
> with different schema"
> I believe this is related to https://issues.apache.org/jira/browse/ARROW-9969
> and in particular, this bit:
> [https://github.com/apache/arrow/blob/master/cpp/src/arrow/table_builder.cc#L72]
> Is the dictionary->Equals comparison checking the signed-ness of the indices?
>
>
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