Jerin John created CALCITE-6367:
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Summary: Add timezone support for FORMAT clause in CAST (enabled
in BigQuery)
Key: CALCITE-6367
URL: https://issues.apache.org/jira/browse/CALCITE-6367
Project: Calcite
Issue Type: Bug
Reporter: Jerin John
This issue is a followup on CALCITE-6269 that fixes some of Calcite's existing
format elements implementation to be aligned to BQ functionality. Two major
formats that might require a bit more rework is adding support for the TZH/TZM
elements along with time zone areas as described below:
* [Parsing timestamp
literals|https://cloud.google.com/bigquery/docs/reference/standard-sql/format-elements#format_tz_as_string]
with timezones as used by BQ does not seem to be supported yet (format element
TZR is unimplemented, BQ has TZH, TZM for hour and minute offsets)
(eg: {{cast('2020.06.03 00:00:53+00' as timestamp format 'YYYY.MM.DD
HH:MI:SSTZH')}}
* BQ format [timezone as string
|https://cloud.google.com/bigquery/docs/reference/standard-sql/format-elements#format_tz_as_string]
can take an additional argument {{{}AT TIME ZONE 'Asia/Kolkata'{}}}, which
would require additional parser changes and time zone parameter to be plumbed
in to the cast operator call.
One important thing to consider, is that the {{SimpleDateFormat}} class which
currently stores the datetime object, may not fully support timezone features
as described and might warrant a broader refactoring of this code.
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