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https://issues.apache.org/jira/browse/ARROW-14518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17436367#comment-17436367
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Kanstantsin Ilchanka commented on ARROW-14518:
----------------------------------------------
Problem here is that Arrow expects fixed scale for all array values as far as
understand
So we will have a problem here,
{code:java}
decimals = [
BigDecimal("1.1"),
BigDecimal("1.10"),
BigDecimal("1.111"),
]
decimals.sum.to_s => "3.311"
Arrow::Decimal128ArrayBuilder.build(
Arrow::Decimal128DataType.new(4, 3), decimals
).sum.to_s => "1.133"{code}
1.1 will be converted to 0.011 to scale to 3 digits after dot
1.10 is the same
Array of decimals should be validated to have the same scale, any other options?
> [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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