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https://issues.apache.org/jira/browse/SPARK-36045?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gengliang Wang resolved SPARK-36045.
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Resolution: Won't Do
> TO_UTC_TIMESTAMP and FROM_UTC_TIMESTAMP should return TimestampNTZ
> ------------------------------------------------------------------
>
> Key: SPARK-36045
> URL: https://issues.apache.org/jira/browse/SPARK-36045
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.3.0
> Reporter: Gengliang Wang
> Priority: Major
>
> Currently, the SQL function to_utc_timestamp is confusing: it just takes the
> timestamp value in the local timezone and then pretends it’s in the provided
> timezone and then returns the UTC value, but the result is still treated as
> local timezone!
> The same issue happens in from_utc_timestamp as well.
> We even tried to deprecated in the OSS community:
> https://github.com/apache/spark/commit/c5e83ab92c0cb514963209dc3e70ba0e24570082
> We should make TO_UTC_TIMESTAMP and FROM_UTC_TIMESTAMP return TimestampNTZ,
> which makes a lot of sense. converting the current local time to/from UTC
> local time.
> The functions should accept both Timestamp types:
> 1. given TimestampLTZ, convert it to TimestampNTZ and continue step #2
> 2. given TimestampNTZ, convert it as to/from UTC local time.
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