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Posted to issues@calcite.apache.org by "Julian Hyde (Jira)" <ji...@apache.org> on 2019/12/12 07:40:00 UTC
[jira] [Comment Edited] (CALCITE-3597) The conversion between
java.sql.Timestamp and long is not asymmetric
[ https://issues.apache.org/jira/browse/CALCITE-3597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16994329#comment-16994329 ]
Julian Hyde edited comment on CALCITE-3597 at 12/12/19 7:39 AM:
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Can you give an example of a SQL query where we currently do the wrong thing? I am skeptical that there is a problem here. Methods in SqlFunctions should only be called internally by Calcite, and afaik Calcite’s SQL functions all work fine.
Also, did you see this: http://mail-archives.apache.org/mod_mbox/calcite-dev/201907.mbox/%3C1FCF4568-09DB-49E3-8F86-C284E744B846@gmail.com%3E ?
was (Author: julianhyde):
Can you give an example of a SQL query where we currently do the wrong thing? I am skeptical that there is a problem here. Methods in SqlFunctions should only be called internally by Calcite, and afaik Calcite’s SQL functions all work fine.
> The conversion between java.sql.Timestamp and long is not asymmetric
> --------------------------------------------------------------------
>
> Key: CALCITE-3597
> URL: https://issues.apache.org/jira/browse/CALCITE-3597
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.21.0
> Reporter: Zhenghua Gao
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In Calcite, we use SqlFunctions.toLong(Timestamp) and SqlFunctions.internalToTimestamp(long) to convert java.sql.Timestmap to internal long and vice versa. The main logical inside is +/- local time zone offset.
> But in the comments of TimeZone.getOffset(long date), the parameter represents in milliseconds since January 1, 1970 00:00:00 GMT. It means that there will one conversion above doesn't satisfy this hypothesis.
>
> This causes many surprise to users:
> (1) some Daylight Saving Time changes:
>
> {code:java}
> @Test public void testDayLightingSaving() {
> TimeZone tz = TimeZone.getDefault();
> TimeZone.setDefault(TimeZone.getTimeZone("America/Los_Angeles"));
> java.sql.Timestamp dst2018Begin = java.sql.Timestamp.valueOf("2018-03-11 03:00:00");
> assertThat(dst2018Begin, is(internalToTimestamp(toLong(dst2018Begin))));
> TimeZone.setDefault(tz);
> }{code}
> fails with:
> {code:java}
> java.lang.AssertionError:
> Expected: is <2018-03-11 04:00:00.0>
> but: was <2018-03-11 03:00:00.0>
> Expected :is <2018-03-11 04:00:00.0>
> Actual :<2018-03-11 03:00:00.0>{code}
>
> (2) "1900-01-01 00:00:00" Changes in some TimeZone
> {code:java}
> @Test public void test() {
> TimeZone tz = TimeZone.getDefault();
> TimeZone.setDefault(TimeZone.getTimeZone("Asia/Shanghai"));
> java.sql.Timestamp ts = java.sql.Timestamp.valueOf("1900-01-01 00:00:00");
> assertThat(ts, is(internalToTimestamp(toLong(ts))));
> TimeZone.setDefault(tz);
> }{code}
> fails with
> {code:java}
> java.lang.AssertionError:
> Expected: is <1899-12-31 23:54:17.0>
> but: was <1900-01-01 00:00:00.0>
> Expected :is <1899-12-31 23:54:17.0>
> Actual :<1900-01-01 00:00:00.0>
> {code}
>
>
>
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