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https://issues.apache.org/jira/browse/HIVE-14568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15503847#comment-15503847
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Akhil Chalamalasetty commented on HIVE-14568:
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Thanks Zhang. We will workaround this issue by casting the column to a lower
precision & scale.
Since we have a few developers migrating from ORACLE and Postgres SQL, we
thought this would be a feature request to ease the usage of Hive. Please let
us know if there is a way to introduce such a mode on Hive and if that would
have a any performance impacts once implemented.
Regards,
AKhil
> Hive Decimal Returns NULL
> -------------------------
>
> Key: HIVE-14568
> URL: https://issues.apache.org/jira/browse/HIVE-14568
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 1.0.0, 1.2.0
> Environment: Centos 6.7, Hadoop 2.7.2,hive 1.0.0,2.0
> Reporter: gurmukh singh
> Assignee: Xuefu Zhang
>
> Hi
> I was under the impression that the bug:
> https://issues.apache.org/jira/browse/HIVE-5022 got fixed. But, I see the
> same issue in Hive 1.0 and hive 1.2 as well.
> hive> desc mul_table;
> OK
> prc decimal(38,28)
> vol decimal(38,10)
> Time taken: 0.068 seconds, Fetched: 2 row(s)
> hive> select prc, vol, prc*vol as cost from mul_table;
> OK
> 1.2 200 NULL
> 1.44 200 NULL
> 2.14 100 NULL
> 3.004 50 NULL
> 1.2 200 NULL
> Time taken: 0.048 seconds, Fetched: 5 row(s)
> Rather then returning NULL, it should give error or round off.
> I understand that, I can use Double instead of decimal or can cast it, but
> still returning "Null" will make many things go unnoticed.
> hive> desc mul_table2;
> OK
> prc double
> vol decimal(14,10)
> Time taken: 0.049 seconds, Fetched: 2 row(s)
> hive> select * from mul_table2;
> OK
> 1.4 200
> 1.34 200
> 7.34 100
> 7454533.354544 100
> Time taken: 0.028 seconds, Fetched: 4 row(s)
> hive> select prc, vol, prc*vol as cost from mul_table3;
> OK
> 7.34 100 734.0
> 7.34 1000 7340.0
> 1.0004 1000 1000.4
> 7454533.354544 100 7.454533354544E8 <----- Wrong result
> 7454533.354544 1000 7.454533354544E9 <----- Wrong result
> Time taken: 0.025 seconds, Fetched: 5 row(s)
> Casting:
> hive> select prc, vol, cast(prc*vol as decimal(38,38)) as cost from
> mul_table3;
> OK
> 7.34 100 NULL
> 7.34 1000 NULL
> 1.0004 1000 NULL
> 7454533.354544 100 NULL
> 7454533.354544 1000 NULL
> Time taken: 0.033 seconds, Fetched: 5 row(s)
> hive> select prc, vol, cast(prc*vol as decimal(38,10)) as cost from
> mul_table3;
> OK
> 7.34 100 734
> 7.34 1000 7340
> 1.0004 1000 1000.4
> 7454533.354544 100 745453335.4544
> 7454533.354544 1000 7454533354.544
> Time taken: 0.026 seconds, Fetched: 5 row(s)
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