[
https://issues.apache.org/jira/browse/HIVE-24389?focusedWorklogId=512363&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-512363
]
ASF GitHub Bot logged work on HIVE-24389:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 16/Nov/20 13:32
Start Date: 16/Nov/20 13:32
Worklog Time Spent: 10m
Work Description: kasakrisz opened a new pull request #1676:
URL: https://github.com/apache/hive/pull/1676
### What changes were proposed in this pull request?
In some case Hive removes trailing zeros of constant decimal numbers
```
select cast(cast(1.1 as decimal(22, 2)) as string), cast(cast(sum(1.1) as
decimal(22, 2)) as string)
1.1 1.10
```
Postgres returns `1.10` for both expressions.
### Why are the changes needed?
Padding decimal values with trailing zeros is not consistent.
### Does this PR introduce _any_ user-facing change?
Yes. With this patch Hive will pad constant decimal values with trailing
zeros up to the specified scale.
### How was this patch tested?
1.Run queries mentioned in the jira.
2. Added test case to `decimal_2.q`
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Issue Time Tracking
-------------------
Worklog Id: (was: 512363)
Remaining Estimate: 0h
Time Spent: 10m
> Trailing zeros of constant decimal numbers are removed
> ------------------------------------------------------
>
> Key: HIVE-24389
> URL: https://issues.apache.org/jira/browse/HIVE-24389
> Project: Hive
> Issue Type: Bug
> Reporter: Krisztian Kasa
> Assignee: Krisztian Kasa
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In some case Hive removes trailing zeros of constant decimal numbers
> {code}
> select cast(1.1 as decimal(22, 2))
> 1.1
> {code}
> In this case *WritableConstantHiveDecimalObjectInspector* is used and this
> object inspector takes it's wrapped HiveDecimal scale instead of the scale
> specified in the wrapped typeinfo:
> {code}
> this = {WritableConstantHiveDecimalObjectInspector@14415}
> value = {HiveDecimalWritable@14426} "1.1"
> typeInfo = {DecimalTypeInfo@14421} "decimal(22,2)"{code}
> However in case of an expression with an aggregate function
> *WritableHiveDecimalObjectInspector* is used
> {code}
> select cast(sum(1.1) as decimal(22, 2))
> 1.10
> {code}
> {code}
> o = {HiveDecimalWritable@16633} "1.1"
> oi = {WritableHiveDecimalObjectInspector@16634}
> typeInfo = {DecimalTypeInfo@16640} "decimal(22,2)"
> {code}
> Casting the expressions to string
> {code:java}
> select cast(cast(1.1 as decimal(22, 2)) as string), cast(cast(sum(1.1) as
> decimal(22, 2)) as string)
> 1.1 1.10
> {code}
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