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https://issues.apache.org/jira/browse/HIVE-5022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13737956#comment-13737956
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Teddy Choi commented on HIVE-5022:
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To avoid this problem, I changed HiveDecimal#multiply as following. It produced
a non-null result, with loss of precision. I'm not sure whether it reflects the
original purpose or not.
{code}
public HiveDecimal multiply(HiveDecimal dec) {
return new HiveDecimal(bd.multiply(dec.bd), true);
}
{code}
> Decimal Arithmetic generates NULL value
> ---------------------------------------
>
> Key: HIVE-5022
> URL: https://issues.apache.org/jira/browse/HIVE-5022
> Project: Hive
> Issue Type: Bug
> Components: Types
> Affects Versions: 0.11.0
> Environment: Hortonworks 1.3 running Hive 0.11.0.1.3.0.0-107
> Reporter: Kevin Soo Hoo
> Assignee: Teddy Choi
>
> When a decimal division is the first operation, the quotient cannot be
> multiplied in a subsequent calculation. Instead, a NULL is returned.
> The following yield NULL results:
> select (cast (4.53 as decimal) / cast(25.86 as decimal)) * cast(0.087 as
> decimal) from <tablename> limit 1;
> select cast (4.53 as decimal) / cast(25.86 as decimal) * cast(0.087 as
> decimal) from <tablename> limit 1;
> If we move the multiplication operation to be first, then it will
> successfully calculate the result.
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