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https://issues.apache.org/jira/browse/HIVE-14281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15384459#comment-15384459
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Xuefu Zhang commented on HIVE-14281:
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Not sure this is a problem though. The next row may contain data with 18
decimal points, for which precision may get lost. I would think user shouldn't
specific decimal(38, 18) for numbers that don't require such a scale.
Of course, we may want to check how other DBs handle this.
> Issue in decimal multiplication
> -------------------------------
>
> Key: HIVE-14281
> URL: https://issues.apache.org/jira/browse/HIVE-14281
> Project: Hive
> Issue Type: Bug
> Components: Types
> Reporter: Chaoyu Tang
> Assignee: Chaoyu Tang
>
> {code}
> CREATE TABLE test (a DECIMAL(38,18), b DECIMAL(38,18));
> INSERT OVERWRITE TABLE test VALUES (20, 20);
> SELECT a*b from test
> {code}
> The returned result is NULL (instead of 400)
> It is because Hive adds the scales from operands and the type for a*b is set
> to decimal (38, 36). Hive could not handle this case properly (e.g. by
> rounding)
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