[jira] [Resolved] (SPARK-39731) Correctness issue when parsing dates with yyyyMMdd format in CSV and JSON

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

     [ https://issues.apache.org/jira/browse/SPARK-39731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-39731.
---------------------------------
    Fix Version/s: 3.4.0
       Resolution: Fixed

Issue resolved by pull request 37147
[https://github.com/apache/spark/pull/37147]

> Correctness issue when parsing dates with yyyyMMdd format in CSV and JSON
> -------------------------------------------------------------------------
>
>                 Key: SPARK-39731
>                 URL: https://issues.apache.org/jira/browse/SPARK-39731
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.4.0
>            Reporter: Ivan Sadikov
>            Assignee: Ivan Sadikov
>            Priority: Major
>             Fix For: 3.4.0
>
>
> In Spark 3.x, when reading CSV data like this:
> {code:java}
> name,mydate
> 1,2020011
> 2,20201203{code}
> and specifying date pattern as "yyyyMMdd", dates are not parsed correctly with CORRECTED time parser policy.
> For example,
> {code:java}
> val df = spark.read.schema("name string, mydate date").option("dateFormat", "yyyyMMdd").option("header", "true").csv("file:/tmp/test.csv")
> df.show(false){code}
> Returns:
> {code:java}
> +----+--------------+
> |name|mydate        |
> +----+--------------+
> |1   |+2020011-01-01|
> |2   |2020-12-03    |
> +----+--------------+ {code}
> and it used to return null instead of the invalid date in Spark 3.2 or below.
>  
> The issue appears to be caused by this PR: [https://github.com/apache/spark/pull/32959].
>  
> A similar issue can observed in JSON data source.
> test.json
> {code:java}
> {"date": "2020011"}
> {"date": "20201203"} {code}
>  
> Running commands
> {code:java}
> val df = spark.read.schema("date date").option("dateFormat", "yyyyMMdd").json("file:/tmp/test.json")
> df.show(false) {code}
> returns
> {code:java}
> +--------------+
> |date          |
> +--------------+
> |+2020011-01-01|
> |2020-12-03    |
> +--------------+{code}
> but before the patch linked in the description it used to show:
> {code:java}
> +----------+
> |date      |
> +----------+
> |7500-08-09|
> |2020-12-03|
> +----------+{code}
> which is strange either way. I will try to address it in the PR.



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