[jira] [Created] (ARROW-14532) [Ruby] Convert Decimal128 arrays to Decimal256 when we have precision out of range error

["Kanstantsin Ilchanka (Jira)" <ji...@apache.org>]

Kanstantsin Ilchanka created ARROW-14532:
--------------------------------------------

             Summary: [Ruby] Convert Decimal128 arrays to Decimal256 when we have precision out of range error
                 Key: ARROW-14532
                 URL: https://issues.apache.org/jira/browse/ARROW-14532
             Project: Apache Arrow
          Issue Type: Bug
            Reporter: Kanstantsin Ilchanka


I'm tried to multiply 2 Decimal128 arrays with max precision(38) and it fails because precision is out of range. I expected that result should be converted to Decimal256 in such case, what do you think?
{code:java}
a = Arrow::Decimal128ArrayBuilder.build(
  Arrow::Decimal128DataType.new(38, 15), [1.1, 2.2, 3.3]
)

b = Arrow::Decimal128ArrayBuilder.build(
  Arrow::Decimal128DataType.new(38, 15), [1.1, 2.2, 3.3]
)

Arrow::Function.find('multiply').execute([a, b])
Arrow::Error::Invalid: [function][execute]: Invalid: Decimal precision out of range: 77

Arrow::Function.find('add').execute([a, b])
Arrow::Error::Invalid: [function][execute]: Invalid: Decimal precision out of range: 39{code}



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