[jira] [Created] (ARROW-12676) RecordBatchBuilder with uint dictionary creates signed int Batch

["Kyle Kavanagh (Jira)" <ji...@apache.org>]

Kyle Kavanagh created ARROW-12676:
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             Summary: 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: New Feature
          Components: C++
    Affects Versions: 3.0.0
            Reporter: Kyle Kavanagh


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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