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https://issues.apache.org/jira/browse/FLINK-11935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16825347#comment-16825347
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Rong Rong commented on FLINK-11935:
-----------------------------------
My feeling is that we should find out why Julian datetime *epoch values* are
somehow converted into Gregorian datetime *string value*.
>From my understanding. The test should not be changed:
{code}
'2017-11-29 22:58:58.998' - 12000.month == '1017-11-29 22:58:58.998'
{code}
This makes sense.
We might need to dig deeper into why the Julian-to-Gregorian conversion
happens. [~twalthr] what do you think?
> Remove DateTimeUtils pull-in and fix datetime casting problem
> -------------------------------------------------------------
>
> Key: FLINK-11935
> URL: https://issues.apache.org/jira/browse/FLINK-11935
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Reporter: Rong Rong
> Assignee: vinoyang
> Priority: Major
>
> This {{DateTimeUtils}} was pulled in in FLINK-7235.
> Originally the time operation was not correctly done via the {{ymdToJulian}}
> function before the date {{1970-01-01}} thus we need the fix. similar to
> addressing this problem:
> {code:java}
> Optimized :1017-12-05 22:58:58.998
> Expected :1017-11-29 22:58:58.998
> Actual :1017-12-05 22:58:58.998
> {code}
>
> However, after pulling in avatica 1.13, I found out that the optimized plans
> of the time operations are actually correct. it is in fact the casting part
> that creates problem:
> For example, the following:
> *{{(plus(-12000.months, cast('2017-11-29 22:58:58.998', TIMESTAMP))}}*
> result in a StringTestExpression of:
> *{{CAST(1017-11-29 22:58:58.998):VARCHAR(65536) CHARACTER SET "UTF-16LE"
> COLLATE "ISO-8859-1$en_US$primary" NOT NULL}}*
> but the testing results are:
> {code:java}
> Optimized :1017-11-29 22:58:58.998
> Expected :1017-11-29 22:58:58.998
> Actual :1017-11-23 22:58:58.998
> {code}
>
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