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Posted to jira@arrow.apache.org by "Nic Crane (Jira)" <ji...@apache.org> on 2021/05/14 07:19:00 UTC

[jira] [Created] (ARROW-12789) [C++] Support for scalar value recycling in RecordBatch/Table creation

Nic Crane created ARROW-12789:
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             Summary: [C++] Support for scalar value recycling in RecordBatch/Table creation
                 Key: ARROW-12789
                 URL: https://issues.apache.org/jira/browse/ARROW-12789
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Nic Crane


Please can we have the capability to be able to recycle scalar values during table creation?  It would work as follows:

Upon creation of a new Table/RecordBatch, the length of each column is checked.  If:
 * number of columns is > 1 and
 * any columns have length 1 and
 * not all columns have length 1

then, the value in the length 1 column(s) should be repeated to make it as long as the other columns. 

This should only occur if all columns either have length 1 or N (where N is some value greater than 1), and if any columns lengths are values other than 1 or N, we should still get an error as we do now.



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