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https://issues.apache.org/jira/browse/HIVE-3820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13607393#comment-13607393
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Gunther Hagleitner commented on HIVE-3820:
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In the integer world we have literals for all int types except integer itself
(which is the default int type). Double/float could follow the same model:
Double is the default, little need to have a special literal, but for float it
makes sense to me.
Decimal is a special case - since numeric values default to double a literal is
necessary to separate from that type.
Glad you pointed HIVE-2586 out, it does validate Ashutosh' thinking and makes
another case for BD instead of D.
> 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-3820.2.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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