Maxim Gekk created SPARK-27252:
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Summary: Make current_date() independent from time zones
Key: SPARK-27252
URL: https://issues.apache.org/jira/browse/SPARK-27252
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.4.0
Reporter: Maxim Gekk
The CurrentDate expression produces a result of DateType which is by definition
number of days since epoch (in UTC time zone). Current implementation shifts
the number of days according to session time zone `spark.sql.session.timeZone`.
Result of shifting cannot be considered as number of days since epoch in UTC
time zone, and cannot have type `DateType`. There are many reasons that makes
the result invalid. For example:
# zone offset depends on an instant in UTC timezone, and zone offset of
`spark.sql.session.timeZone` in shifted date may have different value.
# Result of shifting cannot be considered as number of days since epoch anymore.
The ticket aims to make `current_date` independent from time zone, and to
return the current date in UTC time zone.
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