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https://issues.apache.org/jira/browse/IMPALA-9280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17025470#comment-17025470
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Riza Suminto commented on IMPALA-9280:
--------------------------------------
Hi,
Looking at the datetime-iso-sql-format-parser.cc, it looks like this line in
IsoSqlFormatParser::ProcessSeparatorSequence is the one causing this issue.
{code:java}
// The last '-' of a separator sequence might be taken as a sign for timezone
hour.
if (*(*current_pos - 1) == '-' && dt_ctx.toks[*current_tok_idx].type ==
TIMEZONE_HOUR) {
--(*current_pos);
}{code}
If the previous character is '-' and the next token is TZH, it will move the
pointer back one character to include the '-' sign as part of TZH.
> Time string with signed TZH token preceded by dash cannot be cast to timestamp
> ------------------------------------------------------------------------------
>
> Key: IMPALA-9280
> URL: https://issues.apache.org/jira/browse/IMPALA-9280
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 3.3.0
> Reporter: Jozsef Koza
> Assignee: Riza Suminto
> Priority: Minor
> Labels: newbie
>
> Given a time string containing a TZH token with a sign which is preceded
> immediately by a dash delimiter cannot be cast to timestamp.
> h3. To reproduce
> Execute {code:sql}
> select cast("08:00-+01" as timestamp format "HH:MI-TZH");{code} which results
> in *NULL*.
>
> ----
> It seems like the delimiter is incorrectly recognised as the sign of the
> timezone offset hour which prevents parsing the TZH value.
> Adding an additional delimiter (other than dash itself) between the dash
> separator and the sign in the time string makes cast working.
> Executing
> {code:sql}
> select cast("08:00- +01" as timestamp format "HH:MI-TZH");{code}
> results in *08:00:00*.
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