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https://issues.apache.org/jira/browse/CALCITE-1659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15885968#comment-15885968
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Remus Rusanu commented on CALCITE-1659:
---------------------------------------

I added test case. 

I also added the same logic to {{makeTimestampLiteral}} and made the 
ZonelessTimestamp digest display the sub-second fraction, if relevant. In the 
process of writing tests I also found some issues and opened CALCITE-1664, 
CALCITE-1663 and CALCITE-1662.

> Timestamps are loosing sub-second parts after Calcite literal constant 
> reduction
> --------------------------------------------------------------------------------
>
>                 Key: CALCITE-1659
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1659
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Remus Rusanu
>            Assignee: Julian Hyde
>
> {noformat}
> select cast("1970-12-31 15:59:58.174" as TIMESTAMP) from src limit 1;
> {noformat}
> yields {{1970-12-31 15:59:58}} if CBO is enabled in Hive. 
> {{ZonelessTimestamp.toString()}} contains a truncation 0-19 (ie. removes 
> sub-second part from string representation).



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