[jira] [Updated] (SPARK-31408) Build Spark’s own datetime pattern definition

["Wenchen Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-31408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan updated SPARK-31408:
--------------------------------
    Attachment: Switch to Java 8 time API in Spark 3.0.pdf

> Build Spark’s own datetime pattern definition
> ---------------------------------------------
>
>                 Key: SPARK-31408
>                 URL: https://issues.apache.org/jira/browse/SPARK-31408
>             Project: Spark
>          Issue Type: Umbrella
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Yuanjian Li
>            Priority: Major
>             Fix For: 3.0.0
>
>         Attachments: Switch to Java 8 time API in Spark 3.0.pdf
>
>
> This is an umbrella ticket for building Spark's own Datetime patterns and related works.
> In Spark version 2.4 and earlier, datetime parsing and formatting are performed by the old Java 7 `SimpleDateFormat` API. Since Spark 3.0, we switch to the new Java 8 `DateTimeFormatter` to use the Proleptic Gregorian calendar, which is required by the ISO and SQL standards.
> However, there are some datetime patterns not compatible between Java 8 and Java 7 APIs, and it's fragile to rely on the JDK API to define Spark's behavior. We should build our own Datetime patterns, which is compatible with Spark 2.4 (the old Java 7 `SimpleDateFormat` API).



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