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https://issues.apache.org/jira/browse/ARROW-14518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17436352#comment-17436352
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Kenta Murata commented on ARROW-14518:
--------------------------------------
A {{BigDecimal}} number manages only its precision in its decimal notation.
We can get the precision of a {{BigDecimal}} number by {{BigDecimal#precision}}
method.
{{irb(main):001:0> BigDecimal("1.1").precision}}
{{=> 2}}
But, a {{BigDecimal#precision}} does not count the trailing zeros.
{{irb(main):002:0> BigDecimal("1.10").precision}}
{{=> 2}}
The reason why a {{BigDecimal}} number doesn't have the scale property may be a
{{BigDecimal}} number isn't a fixed-precision number.
> [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}
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