Zachary Tong 7e62ff2823 [Rollup] Validate timezones based on rules not string comparision (#36237)
The date_histogram internally converts obsolete timezones (such as
"Canada/Mountain") into their modern equivalent ("America/Edmonton").
But rollup just stored the TZ as provided by the user.

When checking the TZ for query validation we used a string comparison,
which would fail due to the date_histo's upgrading behavior.

Instead, we should convert both to a TimeZone object and check if their
rules are compatible.
2019-04-17 13:46:44 -04:00
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