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https://issues.apache.org/jira/browse/SPARK-31076?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-31076:
-----------------------------------
Assignee: Maxim Gekk
> Convert Catalyst's DATE/TIMESTAMP to Java Date/Timestamp via local date-time
> ----------------------------------------------------------------------------
>
> Key: SPARK-31076
> URL: https://issues.apache.org/jira/browse/SPARK-31076
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Maxim Gekk
> Assignee: Maxim Gekk
> Priority: Major
>
> By default, collect() returns java.sql.Timestamp/Date instances with offsets
> derived from internal values of Catalyst's TIMESTAMP/DATE that store
> microseconds since the epoch. The conversion from internal values to
> java.sql.Timestamp/Date based on Proleptic Gregorian calendar but converting
> the resulted values before 1582 year to strings produces timestamp/date
> string in Julian calendar. For example:
> {code}
> scala> sql("select date '1100-10-10'").collect()
> res1: Array[org.apache.spark.sql.Row] = Array([1100-10-03])
> {code}
> This can be fixed if internal Catalyst's values are converted to local
> date-time in Gregorian calendar, and construct local date-time from the
> resulted year, month, ..., seconds in Julian calendar.
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