Maxim Gekk created SPARK-27199:
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Summary: Replace TimeZone by ZoneId in TimestampFormatter API
Key: SPARK-27199
URL: https://issues.apache.org/jira/browse/SPARK-27199
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.4.0
Reporter: Maxim Gekk
Internally, TimestampFormatter implementations use ZoneId but not TimeZone
which comes via API. Conversion from TimeZone to ZoneId is not for free.
Actually, TimeZone is converted to String, and the String and parsed to ZoneId.
The conversion to String can be eliminated if TimestampFormatter would accept
ZoneId. And also, TimeZone is converted from String in some cases (JSON
options). So, in bad case String -> TimeZone -> String -> ZoneId -> ZoneOffset.
The ticket aims to use ZoneId in TimestampFormatter API. We could require
ZoneOffset but it is not convenient in most cases because conversion ZoneId to
ZoneOffset requires Instant.
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