Csaba Ringhofer created IMPALA-7060:
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Summary: 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
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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