[jira] [Commented] (HIVE-3820) Consider creating a literal like "D" or "BD" for representing Decimal type constants

["Ashutosh Chauhan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-3820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13600334#comment-13600334 ] 

Ashutosh Chauhan commented on HIVE-3820:
----------------------------------------

Patch looks good. You have chosen D. I wonder if other systems allow d or BD as well. Do you know if sql standard says anything for it?
                
> Consider creating a literal like "D" or "BD" for representing Decimal type constants
> ------------------------------------------------------------------------------------
>
>                 Key: HIVE-3820
>                 URL: https://issues.apache.org/jira/browse/HIVE-3820
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Mark Grover
>            Assignee: Gunther Hagleitner
>         Attachments: HIVE-3820.1.patch, HIVE-3820.D8823.1.patch
>
>
> When the HIVE-2693 gets committed, users are going to see this behavior:
> {code}
> hive> select cast(3.14 as decimal) from decimal_3 limit 1;
> 3.140000000000000124344978758017532527446746826171875
> {code}
> That's intuitively incorrect but is the case because 3.14 (double) is being converted to BigDecimal because of which there is a precision mismatch.
> We should consider creating a new literal for expressing constants of Decimal type as Gunther suggested in HIVE-2693.

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