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https://issues.apache.org/jira/browse/DRILL-793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14005047#comment-14005047
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Chun Chang commented on DRILL-793:
----------------------------------
this was tested on
git.commit.id.abbrev=5d7e3d3
> decimal arithmetic behavior
> ---------------------------
>
> Key: DRILL-793
> URL: https://issues.apache.org/jira/browse/DRILL-793
> Project: Apache Drill
> Issue Type: Bug
> Components: Functions - Drill
> Reporter: Chun Chang
> Assignee: Mehant Baid
>
> How do we decide what significant digits to use when mix different decimals
> in arithmetic calculations? Current implementation is to use numerator as
> reference, this might not be optimal. Here is an example:
> drill:
> 0: jdbc:drill:schema=dfs> select cast('123456789' as decimal(9,0)) /
> cast('12345678901234.56789123456789' as decimal(28,14)) from data limit 1;
> +------------+
> | EXPR$0 |
> +------------+
> | 0 |
> +------------+
> postgres:
> foodmart=# select cast('123456789' as decimal(9,0)) /
> cast('12345678901234.56789123456789' as decimal(28,14)) from data limit 1;
> ?column?
> ----------------------------
> 0.000009999999998999999999
> (1 row)
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