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Kouhei Sutou commented on ARROW-14518: -------------------------------------- We already have {{Arrow::Decimal128}} and {{Arrow::Decimal256}} but {{Arrow::ArrayBuilder.detect_builder_info}} doesn't support them. If we add support for {{Arrow::Decimal128}} and {{Arrow::Decimal256}} to {{Arrow::ArrayBuilder.detect_builder_info}}, we can implement the best approach. We should use a new Jira issue for this approach. The second-best approach will be convenient for many users. Could you add {{BigDecimal#scale}}? Then we implement the second-best approach. We can use this issue for this approach. > [Ruby] ArrayBuilder doesn't work correctly with Decimal > ------------------------------------------------------- > > Key: ARROW-14518 > URL: https://issues.apache.org/jira/browse/ARROW-14518 > Project: Apache Arrow > Issue Type: Bug > Components: Ruby > Reporter: Kanstantsin Ilchanka > Priority: Minor > > When trying to convert raw data with decimal values to Arrow::Table error > received > > {code:java} > Arrow::Table.new(x: [BigDecimal('1.1')]) > ArgumentError: wrong arguments: Arrow::Decimal128ArrayBuilder#initialize(): > available signatures: (data_type: > interface(Arrow::Decimal128DataType(GArrowDecimal128DataType))) > {code} > I guess this is because Decimal128ArrayBuilder expects Decimal128DataType in > initialiser, however I'm not sure how to correctly and effectively detect > precision and scale from array of BigDecimal > > {code:java} > Arrow::VERSION > => "5.0.0"{code} -- This message was sent by Atlassian Jira (v8.3.4#803005)