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https://issues.apache.org/jira/browse/IMPALA-7060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16488880#comment-16488880
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Csaba Ringhofer commented on IMPALA-7060:
-----------------------------------------
Yes, this is a breaking change, but the plan is to release it in 3.x as an
exception. The original plan was to release IMPALA-3307 in 3.0, but that train
was missed. The current plan is to release IMPALA-3307 in a minor version when
it will be ready, but that should not be possible as it is a breaking change -
so this issue (IMPALA-7060) contains the breaking parts, and the intention is
to release it as soon as possible, before 3.x gets actually adopted in
production. The rationale is that this a low risk change, and the timezone
aliases it removes are quite problematic.
> Restrict Impala to only support timezones that work in Hive (IANA + Java)
> -------------------------------------------------------------------------
>
> Key: IMPALA-7060
> URL: https://issues.apache.org/jira/browse/IMPALA-7060
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Csaba Ringhofer
> Assignee: Csaba Ringhofer
> Priority: Major
>
> IANA timezone integration (IMPALA-3307) will drop the support for many
> non-standard timezone aliases. As IMPALA-3307 is a very large change, its
> release may be delayed - meanwhile, it would be better to discourage Impala
> 3.x users from using timezone names that will not be supported in the future.
> For this reason, the current boost based implementation could drop the
> support for non-standard aliases.
> Note that the current implementation has some major issues:
> - Some of the aliases are ambiguous - Impala will always interpret it the
> same way, but this is based on an arbitrary ordering of timezones, so the
> timezone may be actually different than what the user wanted. I think that it
> is better the print a warning in this case.
> - If the name is not among the standard names, the lookup among aliases is
> extremely slow (linear search on all supported standard timezones).
> - Most of the aliases are not covered by test cases.
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