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https://issues.apache.org/jira/browse/HIVE-15331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15752968#comment-15752968
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Sergey Shelukhin commented on HIVE-15331:
-----------------------------------------
+1
> Decimal multiplication with high precision/scale often returns NULL
> -------------------------------------------------------------------
>
> Key: HIVE-15331
> URL: https://issues.apache.org/jira/browse/HIVE-15331
> Project: Hive
> Issue Type: Bug
> Components: Types
> Reporter: Jason Dere
> Assignee: Jason Dere
> Attachments: HIVE-15331.1.patch, HIVE-15331.2.patch,
> HIVE-15331.3.patch
>
>
> {noformat}
> create temporary table dec (a decimal(38,18));
> insert into dec values(100.0);
> hive> select a*a from dec;
> OK
> NULL
> Time taken: 0.165 seconds, Fetched: 1 row(s)
> {noformat}
> Looks like the reason is because the result of decimal(38,18) *
> decimal(38,18) only has 2 digits of precision for integers:
> {noformat}
> hive> set hive.explain.user=false;
> hive> explain select a*a from dec;
> OK
> STAGE DEPENDENCIES:
> Stage-0 is a root stage
> STAGE PLANS:
> Stage: Stage-0
> Fetch Operator
> limit: -1
> Processor Tree:
> TableScan
> alias: dec
> Select Operator
> expressions: (a * a) (type: decimal(38,36))
> outputColumnNames: _col0
> ListSink
> Time taken: 0.039 seconds, Fetched: 15 row(s)
> {noformat}
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